summaryrefslogtreecommitdiff
path: root/gcc/ada/mlib-prj.adb
blob: 8c0d4e1b06f81a2d7ef26a26a0a6d97e009d9101 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                            M L I B . P R J                               --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--                     Copyright (C) 2001-2010, AdaCore                     --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with ALI;      use ALI;
with Gnatvsn;  use Gnatvsn;
with MLib.Fil; use MLib.Fil;
with MLib.Tgt; use MLib.Tgt;
with MLib.Utl; use MLib.Utl;
with Opt;
with Output;   use Output;
with Prj.Com;  use Prj.Com;
with Prj.Env;  use Prj.Env;
with Prj.Util; use Prj.Util;
with Sinput.P;
with Snames;   use Snames;
with Switch;   use Switch;
with Table;
with Targparm; use Targparm;
with Tempdir;
with Types;    use Types;

with Ada.Characters.Handling;

with GNAT.Directory_Operations; use GNAT.Directory_Operations;
with GNAT.HTable;
with Interfaces.C_Streams;      use Interfaces.C_Streams;
with System;                    use System;
with System.Case_Util;          use System.Case_Util;

package body MLib.Prj is

   Prj_Add_Obj_Files : Types.Int;
   pragma Import (C, Prj_Add_Obj_Files, "__gnat_prj_add_obj_files");
   Add_Object_Files : constant Boolean := Prj_Add_Obj_Files /= 0;
   --  Indicates if object files in pragmas Linker_Options (found in the
   --  binder generated file) should be taken when linking a stand-alone
   --  library. False for Windows, True for other platforms.

   ALI_Suffix : constant String := ".ali";

   B_Start : String_Ptr := new String'("b~");
   --  Prefix of bind file, changed to b__ for VMS

   S_Osinte_Ads : File_Name_Type := No_File;
   --  Name_Id for "s-osinte.ads"

   S_Dec_Ads : File_Name_Type := No_File;
   --  Name_Id for "dec.ads"

   G_Trasym_Ads : File_Name_Type := No_File;
   --  Name_Id for "g-trasym.ads"

   Arguments : String_List_Access := No_Argument;
   --  Used to accumulate arguments for the invocation of gnatbind and of
   --  the compiler. Also used to collect the interface ALI when copying
   --  the ALI files to the library directory.

   Argument_Number : Natural := 0;
   --  Index of the last argument in Arguments

   Initial_Argument_Max : constant := 10;

   No_Main_String : aliased String := "-n";
   No_Main : constant String_Access := No_Main_String'Access;

   Output_Switch_String : aliased String := "-o";
   Output_Switch : constant String_Access := Output_Switch_String'Access;

   Compile_Switch_String : aliased String := "-c";
   Compile_Switch : constant String_Access := Compile_Switch_String'Access;

   Auto_Initialize : constant String := "-a";

   --  List of objects to put inside the library

   Object_Files : Argument_List_Access;

   package Objects is new Table.Table
     (Table_Name           => "Mlib.Prj.Objects",
      Table_Component_Type => String_Access,
      Table_Index_Type     => Natural,
      Table_Low_Bound      => 1,
      Table_Initial        => 50,
      Table_Increment      => 100);

   package Objects_Htable is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");

   --  List of ALI files

   Ali_Files : Argument_List_Access;

   package ALIs is new Table.Table
     (Table_Name           => "Mlib.Prj.Alis",
      Table_Component_Type => String_Access,
      Table_Index_Type     => Natural,
      Table_Low_Bound      => 1,
      Table_Initial        => 50,
      Table_Increment      => 100);

   --  List of options set in the command line

   Options : Argument_List_Access;

   package Opts is new Table.Table
     (Table_Name           => "Mlib.Prj.Opts",
      Table_Component_Type => String_Access,
      Table_Index_Type     => Natural,
      Table_Low_Bound      => 1,
      Table_Initial        => 5,
      Table_Increment      => 100);

   --  All the ALI file in the library

   package Library_ALIs is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => File_Name_Type,
      Hash       => Hash,
      Equal      => "=");

   --  The ALI files in the interface sets

   package Interface_ALIs is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => File_Name_Type,
      Hash       => Hash,
      Equal      => "=");

   --  The ALI files that have been processed to check if the corresponding
   --  library unit is in the interface set.

   package Processed_ALIs is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => File_Name_Type,
      Hash       => Hash,
      Equal      => "=");

   --  The projects imported directly or indirectly

   package Processed_Projects is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Boolean,
      No_Element => False,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");

   --  The library projects imported directly or indirectly

   package Library_Projs is new Table.Table (
     Table_Component_Type => Project_Id,
     Table_Index_Type     => Integer,
     Table_Low_Bound      => 1,
     Table_Initial        => 10,
     Table_Increment      => 10,
     Table_Name           => "Make.Library_Projs");

   type Build_Mode_State is (None, Static, Dynamic, Relocatable);

   procedure Add_Argument (S : String);
   --  Add one argument to Arguments array, if array is full, double its size

   function ALI_File_Name (Source : String) return String;
   --  Return the ALI file name corresponding to a source

   procedure Check (Filename : String);
   --  Check if filename is a regular file. Fail if it is not

   procedure Check_Context;
   --  Check each object files in table Object_Files
   --  Fail if any of them is not a regular file

   procedure Copy_Interface_Sources
     (For_Project : Project_Id;
      In_Tree     : Project_Tree_Ref;
      Interfaces  : Argument_List;
      To_Dir      : Path_Name_Type);
   --  Copy the interface sources of a SAL to directory To_Dir

   procedure Display (Executable : String);
   --  Display invocation of gnatbind and of the compiler with the arguments
   --  in Arguments, except when Quiet_Output is True.

   function Index (S, Pattern : String) return Natural;
   --  Return the last occurrence of Pattern in S, or 0 if none

   procedure Process_Binder_File (Name : String);
   --  For Stand-Alone libraries, get the Linker Options in the binder
   --  generated file.

   procedure Reset_Tables;
   --  Make sure that all the above tables are empty
   --  (Objects, Ali_Files, Options).

   function SALs_Use_Constructors return Boolean;
   --  Indicate if Stand-Alone Libraries are automatically initialized using
   --  the constructor mechanism.

   ------------------
   -- Add_Argument --
   ------------------

   procedure Add_Argument (S : String) is
   begin
      if Argument_Number = Arguments'Last then
         declare
            New_Args : constant String_List_Access :=
              new String_List (1 .. 2 * Arguments'Last);

         begin
            --  Copy the String_Accesses and set them to null in Arguments
            --  so that they will not be deallocated by the call to
            --  Free (Arguments).

            New_Args (Arguments'Range) := Arguments.all;
            Arguments.all := (others => null);
            Free (Arguments);
            Arguments := New_Args;
         end;
      end if;

      Argument_Number := Argument_Number + 1;
      Arguments (Argument_Number) := new String'(S);
   end Add_Argument;

   -------------------
   -- ALI_File_Name --
   -------------------

   function ALI_File_Name (Source : String) return String is
   begin
      --  If the source name has an extension, then replace it with
      --  the ALI suffix.

      for Index in reverse Source'First + 1 .. Source'Last loop
         if Source (Index) = '.' then
            return Source (Source'First .. Index - 1) & ALI_Suffix;
         end if;
      end loop;

      --  If there is no dot, or if it is the first character, just add the
      --  ALI suffix.

      return Source & ALI_Suffix;
   end ALI_File_Name;

   -------------------
   -- Build_Library --
   -------------------

   procedure Build_Library
     (For_Project   : Project_Id;
      In_Tree       : Project_Tree_Ref;
      Gnatbind      : String;
      Gnatbind_Path : String_Access;
      Gcc           : String;
      Gcc_Path      : String_Access;
      Bind          : Boolean := True;
      Link          : Boolean := True)
   is
      Maximum_Size : Integer;
      pragma Import (C, Maximum_Size, "__gnat_link_max");
      --  Maximum number of bytes to put in an invocation of the
      --  gnatbind.

      Size : Integer;
      --  The number of bytes for the invocation of the gnatbind

      Warning_For_Library : Boolean := False;
      --  Set to True for the first warning about a unit missing from the
      --  interface set.

      Current_Proj : Project_Id;

      Libgnarl_Needed   : Yes_No_Unknown := For_Project.Libgnarl_Needed;
      --  Set to True if library needs to be linked with libgnarl

      Libdecgnat_Needed : Boolean := False;
      --  On OpenVMS, set to True if library needs to be linked with libdecgnat

      Gtrasymobj_Needed : Boolean := False;
      --  On OpenVMS, set to True if library needs to be linked with
      --  g-trasym.obj.

      Object_Directory_Path : constant String :=
                                Get_Name_String
                                  (For_Project.Object_Directory.Display_Name);

      Standalone   : constant Boolean := For_Project.Standalone_Library;

      Project_Name : constant String := Get_Name_String (For_Project.Name);

      Current_Dir  : constant String := Get_Current_Dir;

      Lib_Filename : String_Access;
      Lib_Dirpath  : String_Access;
      Lib_Version  : String_Access := new String'("");

      The_Build_Mode : Build_Mode_State := None;

      Success : Boolean := False;

      Library_Options : Variable_Value := Nil_Variable_Value;

      Driver_Name : Name_Id := No_Name;

      In_Main_Object_Directory : Boolean := True;

      Foreign_Sources : Boolean;

      Rpath : String_Access := null;
      --  Allocated only if Path Option is supported

      Rpath_Last : Natural := 0;
      --  Index of last valid character of Rpath

      Initial_Rpath_Length : constant := 200;
      --  Initial size of Rpath, when first allocated

      Path_Option : String_Access := Linker_Library_Path_Option;
      --  If null, Path Option is not supported.
      --  Not a constant so that it can be deallocated.

      First_ALI : File_Name_Type := No_File;
      --  Store the ALI file name of a source of the library (the first found)

      procedure Add_ALI_For (Source : File_Name_Type);
      --  Add the name of the ALI file corresponding to Source to the
      --  Arguments.

      procedure Add_Rpath (Path : String);
      --  Add a path name to Rpath

      function Check_Project (P : Project_Id) return Boolean;
      --  Returns True if P is For_Project or a project extended by For_Project

      procedure Check_Libs (ALI_File : String; Main_Project : Boolean);
      --  Set Libgnarl_Needed if the ALI_File indicates that there is a need
      --  to link with -lgnarl (this is the case when there is a dependency
      --  on s-osinte.ads). On OpenVMS, set Libdecgnat_Needed if the ALI file
      --  indicates that there is a need to link with -ldecgnat (this is the
      --  case when there is a dependency on dec.ads), and set
      --  Gtrasymobj_Needed if there is a dependency on g-trasym.ads.

      procedure Process (The_ALI : File_Name_Type);
      --  Check if the closure of a library unit which is or should be in the
      --  interface set is also in the interface set. Issue a warning for each
      --  missing library unit.

      procedure Process_Imported_Libraries;
      --  Add the -L and -l switches for the imported Library Project Files,
      --  and, if Path Option is supported, the library directory path names
      --  to Rpath.

      -----------------
      -- Add_ALI_For --
      -----------------

      procedure Add_ALI_For (Source : File_Name_Type) is
         ALI    : constant String := ALI_File_Name (Get_Name_String (Source));
         ALI_Id : File_Name_Type;

      begin
         if Bind then
            Add_Argument (ALI);
         end if;

         Name_Len := 0;
         Add_Str_To_Name_Buffer (S => ALI);
         ALI_Id := Name_Find;

         --  Add the ALI file name to the library ALIs

         if Bind then
            Library_ALIs.Set (ALI_Id, True);
         end if;

         --  Set First_ALI, if not already done

         if First_ALI = No_File then
            First_ALI := ALI_Id;
         end if;
      end Add_ALI_For;

      ---------------
      -- Add_Rpath --
      ---------------

      procedure Add_Rpath (Path : String) is

         procedure Double;
         --  Double Rpath size

         ------------
         -- Double --
         ------------

         procedure Double is
            New_Rpath : constant String_Access :=
                          new String (1 .. 2 * Rpath'Length);
         begin
            New_Rpath (1 .. Rpath_Last) := Rpath (1 .. Rpath_Last);
            Free (Rpath);
            Rpath := New_Rpath;
         end Double;

      --  Start of processing for Add_Rpath

      begin
         --  If first path, allocate initial Rpath

         if Rpath = null then
            Rpath := new String (1 .. Initial_Rpath_Length);
            Rpath_Last := 0;

         else
            --  Otherwise, add a path separator between two path names

            if Rpath_Last = Rpath'Last then
               Double;
            end if;

            Rpath_Last := Rpath_Last + 1;
            Rpath (Rpath_Last) := Path_Separator;
         end if;

         --  Increase Rpath size until it is large enough

         while Rpath_Last + Path'Length > Rpath'Last loop
            Double;
         end loop;

         --  Add the path name

         Rpath (Rpath_Last + 1 .. Rpath_Last + Path'Length) := Path;
         Rpath_Last := Rpath_Last + Path'Length;
      end Add_Rpath;

      -------------------
      -- Check_Project --
      -------------------

      function Check_Project (P : Project_Id) return Boolean is
      begin
         if P = For_Project then
            return True;

         elsif P /= No_Project then
            declare
               Proj : Project_Id;

            begin
               Proj := For_Project;
               while Proj.Extends /= No_Project loop
                  if P = Proj.Extends then
                     return True;
                  end if;

                  Proj := Proj.Extends;
               end loop;
            end;
         end if;

         return False;
      end Check_Project;

      ----------------
      -- Check_Libs --
      ----------------

      procedure Check_Libs (ALI_File : String; Main_Project : Boolean) is
         Lib_File : File_Name_Type;
         Text     : Text_Buffer_Ptr;
         Id       : ALI.ALI_Id;

      begin
         if Libgnarl_Needed /= Yes
           or else
            (Main_Project
              and then OpenVMS_On_Target
              and then ((not Libdecgnat_Needed) or (not Gtrasymobj_Needed)))
         then
            --  Scan the ALI file

            Name_Len := ALI_File'Length;
            Name_Buffer (1 .. Name_Len) := ALI_File;
            Lib_File := Name_Find;
            Text := Read_Library_Info (Lib_File, True);

            Id := ALI.Scan_ALI
                    (F          => Lib_File,
                     T          => Text,
                     Ignore_ED  => False,
                     Err        => True,
                     Read_Lines => "D");
            Free (Text);

            --  Look for s-osinte.ads in the dependencies

            for Index in ALI.ALIs.Table (Id).First_Sdep ..
                         ALI.ALIs.Table (Id).Last_Sdep
            loop
               if ALI.Sdep.Table (Index).Sfile = S_Osinte_Ads then
                  Libgnarl_Needed := Yes;

                  if Main_Project then
                     For_Project.Libgnarl_Needed := Yes;
                  else
                     exit;
                  end if;

               elsif OpenVMS_On_Target then
                  if ALI.Sdep.Table (Index).Sfile = S_Dec_Ads then
                     Libdecgnat_Needed := True;

                  elsif ALI.Sdep.Table (Index).Sfile = G_Trasym_Ads then
                     Gtrasymobj_Needed := True;
                  end if;
               end if;
            end loop;
         end if;
      end Check_Libs;

      -------------
      -- Process --
      -------------

      procedure Process (The_ALI : File_Name_Type) is
         Text       : Text_Buffer_Ptr;
         Idread     : ALI_Id;
         First_Unit : ALI.Unit_Id;
         Last_Unit  : ALI.Unit_Id;
         Unit_Data  : Unit_Record;
         Afile      : File_Name_Type;

      begin
         --  Nothing to do if the ALI file has already been processed.
         --  This happens if an interface imports another interface.

         if not Processed_ALIs.Get (The_ALI) then
            Processed_ALIs.Set (The_ALI, True);
            Text := Read_Library_Info (The_ALI);

            if Text /= null then
               Idread :=
                 Scan_ALI
                   (F         => The_ALI,
                    T         => Text,
                    Ignore_ED => False,
                    Err       => True);
               Free (Text);

               if Idread /= No_ALI_Id then
                  First_Unit := ALI.ALIs.Table (Idread).First_Unit;
                  Last_Unit  := ALI.ALIs.Table (Idread).Last_Unit;

                  --  Process both unit (spec and body) if the body is needed
                  --  by the spec (inline or generic). Otherwise, just process
                  --  the spec.

                  if First_Unit /= Last_Unit and then
                    not ALI.Units.Table (Last_Unit).Body_Needed_For_SAL
                  then
                     First_Unit := Last_Unit;
                  end if;

                  for Unit in First_Unit .. Last_Unit loop
                     Unit_Data := ALI.Units.Table (Unit);

                     --  Check if each withed unit which is in the library is
                     --  also in the interface set, if it has not yet been
                     --  processed.

                     for W in Unit_Data.First_With .. Unit_Data.Last_With loop
                        Afile := Withs.Table (W).Afile;

                        if Afile /= No_File and then Library_ALIs.Get (Afile)
                          and then not Processed_ALIs.Get (Afile)
                        then
                           if not Interface_ALIs.Get (Afile) then
                              if not Warning_For_Library then
                                 Write_Str ("Warning: In library project """);
                                 Get_Name_String (Current_Proj.Name);
                                 To_Mixed (Name_Buffer (1 .. Name_Len));
                                 Write_Str (Name_Buffer (1 .. Name_Len));
                                 Write_Line ("""");
                                 Warning_For_Library := True;
                              end if;

                              Write_Str ("         Unit """);
                              Get_Name_String (Withs.Table (W).Uname);
                              To_Mixed (Name_Buffer (1 .. Name_Len - 2));
                              Write_Str (Name_Buffer (1 .. Name_Len - 2));
                              Write_Line (""" is not in the interface set");
                              Write_Str ("         but it is needed by ");

                              case Unit_Data.Utype is
                                 when Is_Spec =>
                                    Write_Str ("the spec of ");

                                 when Is_Body =>
                                    Write_Str ("the body of ");

                                 when others =>
                                    null;
                              end case;

                              Write_Str ("""");
                              Get_Name_String (Unit_Data.Uname);
                              To_Mixed (Name_Buffer (1 .. Name_Len - 2));
                              Write_Str (Name_Buffer (1 .. Name_Len - 2));
                              Write_Line ("""");
                           end if;

                           --  Now, process this unit

                           Process (Afile);
                        end if;
                     end loop;
                  end loop;
               end if;
            end if;
         end if;
      end Process;

      --------------------------------
      -- Process_Imported_Libraries --
      --------------------------------

      procedure Process_Imported_Libraries is
         Current : Project_Id;

         procedure Process_Project (Project : Project_Id);
         --  Process Project and its imported projects recursively.
         --  Add any library projects to table Library_Projs.

         ---------------------
         -- Process_Project --
         ---------------------

         procedure Process_Project (Project : Project_Id) is
            Imported : Project_List;

         begin
            --  Nothing to do if process has already been processed

            if not Processed_Projects.Get (Project.Name) then
               Processed_Projects.Set (Project.Name, True);

               --  Call Process_Project recursively for any imported project.
               --  We first process the imported projects to guarantee that
               --  we have a proper reverse order for the libraries.

               Imported := Project.Imported_Projects;
               while Imported /= null loop
                  if Imported.Project /= No_Project then
                     Process_Project (Imported.Project);
                  end if;

                  Imported := Imported.Next;
               end loop;

               --  If it is a library project, add it to Library_Projs

               if Project /= For_Project and then Project.Library then
                  Library_Projs.Increment_Last;
                  Library_Projs.Table (Library_Projs.Last) := Project;

                  --  Check if because of this library we need to use libgnarl

                  if Libgnarl_Needed = Unknown then
                     if Project.Libgnarl_Needed = Unknown
                       and then Project.Object_Directory /= No_Path_Information
                     then
                        --  Check if libgnarl is needed for this library

                        declare
                           Object_Dir_Path : constant String :=
                                               Get_Name_String
                                                 (Project.Object_Directory.
                                                    Display_Name);
                           Object_Dir      : Dir_Type;
                           Filename        : String (1 .. 255);
                           Last            : Natural;

                        begin
                           Open (Object_Dir, Object_Dir_Path);

                           --  For all entries in the object directory

                           loop
                              Read (Object_Dir, Filename, Last);
                              exit when Last = 0;

                              --  Check if it is an object file

                              if Is_Obj (Filename (1 .. Last)) then
                                 declare
                                    Object_Path : constant String :=
                                                    Normalize_Pathname
                                                      (Object_Dir_Path &
                                                       Directory_Separator &
                                                       Filename (1 .. Last));
                                    ALI_File    : constant String :=
                                                    Ext_To
                                                      (Object_Path, "ali");

                                 begin
                                    if Is_Regular_File (ALI_File) then

                                       --  Find out if for this ALI file,
                                       --  libgnarl is necessary.

                                       Check_Libs
                                         (ALI_File, Main_Project => False);

                                       if Libgnarl_Needed = Yes then
                                          Project.Libgnarl_Needed := Yes;
                                          For_Project.Libgnarl_Needed := Yes;
                                          exit;
                                       end if;
                                    end if;
                                 end;
                              end if;
                           end loop;

                           Close (Object_Dir);
                        end;
                     end if;

                     if Project.Libgnarl_Needed = Yes then
                        Libgnarl_Needed := Yes;
                        For_Project.Libgnarl_Needed := Yes;
                     end if;
                  end if;
               end if;
            end if;
         end Process_Project;

      --  Start of processing for Process_Imported_Libraries

      begin
         --  Build list of library projects imported directly or indirectly,
         --  in the reverse order.

         Process_Project (For_Project);

         --  Add the -L and -l switches and, if the Rpath option is supported,
         --  add the directory to the Rpath. As the library projects are in the
         --  wrong order, process from the last to the first.

         for Index in reverse 1 .. Library_Projs.Last loop
            Current := Library_Projs.Table (Index);

            Get_Name_String (Current.Library_Dir.Display_Name);
            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'("-L" & Name_Buffer (1 .. Name_Len));

            if Path_Option /= null then
               Add_Rpath (Name_Buffer (1 .. Name_Len));
            end if;

            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'("-l" & Get_Name_String (Current.Library_Name));
         end loop;
      end Process_Imported_Libraries;

   --  Start of processing for Build_Library

   begin
      Reset_Tables;

      --  Fail if project is not a library project

      if not For_Project.Library then
         Com.Fail ("project """ & Project_Name & """ has no library");
      end if;

      --  Do not attempt to build the library if it is externally built

      if For_Project.Externally_Built then
         return;
      end if;

      --  If this is the first time Build_Library is called, get the Name_Id
      --  of "s-osinte.ads".

      if S_Osinte_Ads = No_File then
         Name_Len := 0;
         Add_Str_To_Name_Buffer ("s-osinte.ads");
         S_Osinte_Ads := Name_Find;
      end if;

      if S_Dec_Ads = No_File then
         Name_Len := 0;
         Add_Str_To_Name_Buffer ("dec.ads");
         S_Dec_Ads := Name_Find;
      end if;

      if G_Trasym_Ads = No_File then
         Name_Len := 0;
         Add_Str_To_Name_Buffer ("g-trasym.ads");
         G_Trasym_Ads := Name_Find;
      end if;

      --  We work in the object directory

      Change_Dir (Object_Directory_Path);

      if Standalone then

         --  Call gnatbind only if Bind is True

         if Bind then
            if Gnatbind_Path = null then
               Com.Fail ("unable to locate " & Gnatbind);
            end if;

            if Gcc_Path = null then
               Com.Fail ("unable to locate " & Gcc);
            end if;

            --  Allocate Arguments, if it is the first time we see a standalone
            --  library.

            if Arguments = No_Argument then
               Arguments := new String_List (1 .. Initial_Argument_Max);
            end if;

            --  Add "-n -o b~<lib>.adb (b__<lib>.adb on VMS) -L<lib>"

            Argument_Number := 2;
            Arguments (1) := No_Main;
            Arguments (2) := Output_Switch;

            if OpenVMS_On_Target then
               B_Start := new String'("b__");
            end if;

            Add_Argument
              (B_Start.all
               & Get_Name_String (For_Project.Library_Name) & ".adb");
            Add_Argument ("-L" & Get_Name_String (For_Project.Library_Name));

            if For_Project.Lib_Auto_Init and then SALs_Use_Constructors then
               Add_Argument (Auto_Initialize);
            end if;

            --  Check if Binder'Default_Switches ("Ada") is defined. If it is,
            --  add these switches to call gnatbind.

            declare
               Binder_Package : constant Package_Id :=
                                  Value_Of
                                    (Name        => Name_Binder,
                                     In_Packages => For_Project.Decl.Packages,
                                     In_Tree     => In_Tree);

            begin
               if Binder_Package /= No_Package then
                  declare
                     Defaults : constant Array_Element_Id :=
                                  Value_Of
                                    (Name      => Name_Default_Switches,
                                     In_Arrays =>
                                       In_Tree.Packages.Table
                                         (Binder_Package).Decl.Arrays,
                                     In_Tree   => In_Tree);
                     Switches : Variable_Value := Nil_Variable_Value;

                     Switch : String_List_Id := Nil_String;

                  begin
                     if Defaults /= No_Array_Element then
                        Switches :=
                          Value_Of
                            (Index     => Name_Ada,
                             Src_Index => 0,
                             In_Array  => Defaults,
                             In_Tree   => In_Tree);

                        if not Switches.Default then
                           Switch := Switches.Values;

                           while Switch /= Nil_String loop
                              Add_Argument
                                (Get_Name_String
                                   (In_Tree.String_Elements.Table
                                      (Switch).Value));
                              Switch := In_Tree.String_Elements.
                                          Table (Switch).Next;
                           end loop;
                        end if;
                     end if;
                  end;
               end if;
            end;
         end if;

         --  Get all the ALI files of the project file. We do that even if
         --  Bind is False, so that First_ALI is set.

         declare
            Unit : Unit_Index;

         begin
            Library_ALIs.Reset;
            Interface_ALIs.Reset;
            Processed_ALIs.Reset;

            Unit := Units_Htable.Get_First (In_Tree.Units_HT);
            while Unit /= No_Unit_Index loop
               if Unit.File_Names (Impl) /= null
                 and then not Unit.File_Names (Impl).Locally_Removed
               then
                  if Check_Project (Unit.File_Names (Impl).Project) then
                     if Unit.File_Names (Spec) = null then
                        declare
                           Src_Ind : Source_File_Index;

                        begin
                           Src_Ind := Sinput.P.Load_Project_File
                                        (Get_Name_String
                                          (Unit.File_Names (Impl).Path.Name));

                           --  Add the ALI file only if it is not a subunit

                           if not
                             Sinput.P.Source_File_Is_Subunit (Src_Ind)
                           then
                              Add_ALI_For (Unit.File_Names (Impl).File);
                              exit when not Bind;
                           end if;
                        end;

                     else
                        Add_ALI_For (Unit.File_Names (Impl).File);
                        exit when not Bind;
                     end if;
                  end if;

               elsif Unit.File_Names (Spec) /= null
                 and then not Unit.File_Names (Spec).Locally_Removed
                 and then Check_Project (Unit.File_Names (Spec).Project)
               then
                  Add_ALI_For (Unit.File_Names (Spec).File);
                  exit when not Bind;
               end if;

               Unit := Units_Htable.Get_Next (In_Tree.Units_HT);
            end loop;
         end;

         --  Continue setup and call gnatbind if Bind is True

         if Bind then

            --  Get an eventual --RTS from the ALI file

            if First_ALI /= No_File then
               declare
                  T : Text_Buffer_Ptr;
                  A : ALI_Id;

               begin
                  --  Load the ALI file

                  T := Read_Library_Info (First_ALI, True);

                  --  Read it

                  A := Scan_ALI
                         (First_ALI, T, Ignore_ED => False, Err => False);

                  if A /= No_ALI_Id then
                     for Index in
                       ALI.Units.Table
                         (ALI.ALIs.Table (A).First_Unit).First_Arg ..
                       ALI.Units.Table
                         (ALI.ALIs.Table (A).First_Unit).Last_Arg
                     loop
                        --  If --RTS found, add switch to call gnatbind

                        declare
                           Arg : String_Ptr renames Args.Table (Index);
                        begin
                           if Arg'Length >= 6 and then
                              Arg (Arg'First + 2 .. Arg'First + 5) = "RTS="
                           then
                              Add_Argument (Arg.all);
                              exit;
                           end if;
                        end;
                     end loop;
                  end if;
               end;
            end if;

            --  Set the paths

            Set_Ada_Paths
              (Project             => For_Project,
               In_Tree             => In_Tree,
               Including_Libraries => True);

            --  Display the gnatbind command, if not in quiet output

            Display (Gnatbind);

            Size := 0;
            for J in 1 .. Argument_Number loop
               Size := Size + Arguments (J)'Length + 1;
            end loop;

            --  Invoke gnatbind with the arguments if the size is not too large

            if Size <= Maximum_Size then
               Spawn
                 (Gnatbind_Path.all,
                  Arguments (1 .. Argument_Number),
                  Success);

            else
               --  Otherwise create a temporary response file

               declare
                  FD            : File_Descriptor;
                  Path          : Path_Name_Type;
                  Args          : Argument_List (1 .. 1);
                  EOL           : constant String (1 .. 1) := (1 => ASCII.LF);
                  Status        : Integer;
                  Succ          : Boolean;
                  Quotes_Needed : Boolean;
                  Last_Char     : Natural;
                  Ch            : Character;

               begin
                  Tempdir.Create_Temp_File (FD, Path);
                  Args (1) := new String'("@" & Get_Name_String (Path));

                  for J in 1 .. Argument_Number loop

                     --  Check if the argument should be quoted

                     Quotes_Needed := False;
                     Last_Char     := Arguments (J)'Length;

                     for K in Arguments (J)'Range loop
                        Ch := Arguments (J) (K);

                        if Ch = ' ' or else Ch = ASCII.HT or else Ch = '"' then
                           Quotes_Needed := True;
                           exit;
                        end if;
                     end loop;

                     if Quotes_Needed then

                        --  Quote the argument, doubling '"'

                        declare
                           Arg : String (1 .. Arguments (J)'Length * 2 + 2);

                        begin
                           Arg (1) := '"';
                           Last_Char := 1;

                           for K in Arguments (J)'Range loop
                              Ch := Arguments (J) (K);
                              Last_Char := Last_Char + 1;
                              Arg (Last_Char) := Ch;

                              if Ch = '"' then
                                 Last_Char := Last_Char + 1;
                                 Arg (Last_Char) := '"';
                              end if;
                           end loop;

                           Last_Char := Last_Char + 1;
                           Arg (Last_Char) := '"';

                           Status := Write (FD, Arg'Address, Last_Char);
                        end;

                     else
                        Status := Write
                          (FD,
                           Arguments (J) (Arguments (J)'First)'Address,
                           Last_Char);
                     end if;

                     if Status /= Last_Char then
                        Fail ("disk full");
                     end if;

                     Status := Write (FD, EOL (1)'Address, 1);

                     if Status /= 1 then
                        Fail ("disk full");
                     end if;
                  end loop;

                  Close (FD);

                  --  And invoke gnatbind with this response file

                  Spawn (Gnatbind_Path.all, Args, Success);

                  Delete_File (Get_Name_String (Path), Succ);

                  if not Succ then
                     null;
                  end if;
               end;
            end if;

            if not Success then
               Com.Fail ("could not bind standalone library "
                         & Get_Name_String (For_Project.Library_Name));
            end if;
         end if;

         --  Compile the binder generated file only if Link is true

         if Link then

            --  Set the paths

            Set_Ada_Paths
              (Project             => For_Project,
               In_Tree             => In_Tree,
               Including_Libraries => True);

            --  Invoke <gcc> -c b__<lib>.adb

            --  Allocate Arguments, if it is the first time we see a standalone
            --  library.

            if Arguments = No_Argument then
               Arguments := new String_List (1 .. Initial_Argument_Max);
            end if;

            Argument_Number := 1;
            Arguments (1) := Compile_Switch;

            if OpenVMS_On_Target then
               B_Start := new String'("b__");
            end if;

            Add_Argument
              (B_Start.all
               & Get_Name_String (For_Project.Library_Name) & ".adb");

            --  If necessary, add the PIC option

            if PIC_Option /= "" then
               Add_Argument (PIC_Option);
            end if;

            --  Get the back-end switches and --RTS from the ALI file

            if First_ALI /= No_File then
               declare
                  T : Text_Buffer_Ptr;
                  A : ALI_Id;

               begin
                  --  Load the ALI file

                  T := Read_Library_Info (First_ALI, True);

                  --  Read it

                  A :=
                    Scan_ALI (First_ALI, T, Ignore_ED => False, Err => False);

                  if A /= No_ALI_Id then
                     for Index in
                       ALI.Units.Table
                         (ALI.ALIs.Table (A).First_Unit).First_Arg ..
                       ALI.Units.Table
                         (ALI.ALIs.Table (A).First_Unit).Last_Arg
                     loop
                        --  Do not compile with the front end switches except
                        --  for --RTS.

                        declare
                           Arg : String_Ptr renames Args.Table (Index);
                        begin
                           if not Is_Front_End_Switch (Arg.all)
                             or else
                               Arg (Arg'First + 2 .. Arg'First + 5) = "RTS="
                           then
                              Add_Argument (Arg.all);
                           end if;
                        end;
                     end loop;
                  end if;
               end;
            end if;

            --  Now that all the arguments are set, compile the binder
            --  generated file.

            Display (Gcc);
            Spawn
              (Gcc_Path.all, Arguments (1 .. Argument_Number), Success);

            if not Success then
               Com.Fail
                ("could not compile binder generated file for library "
                  & Get_Name_String (For_Project.Library_Name));
            end if;

            --  Process binder generated file for pragmas Linker_Options

            Process_Binder_File (Arguments (2).all & ASCII.NUL);
         end if;
      end if;

      --  Build the library only if Link is True

      if Link then

         --  If attributes Library_GCC or Linker'Driver were specified, get the
         --  driver name.

         if For_Project.Config.Shared_Lib_Driver /= No_File then
            Driver_Name := Name_Id (For_Project.Config.Shared_Lib_Driver);
         end if;

         --  If attribute Library_Options was specified, add these additional
         --  options.

         Library_Options := Value_Of
           (Name_Library_Options, For_Project.Decl.Attributes, In_Tree);

         if not Library_Options.Default then
            declare
               Current : String_List_Id;
               Element : String_Element;

            begin
               Current := Library_Options.Values;
               while Current /= Nil_String loop
                  Element := In_Tree.String_Elements.Table (Current);
                  Get_Name_String (Element.Value);

                  if Name_Len /= 0 then
                     Opts.Increment_Last;
                     Opts.Table (Opts.Last) :=
                       new String'(Name_Buffer (1 .. Name_Len));
                  end if;

                  Current := Element.Next;
               end loop;
            end;
         end if;

         Lib_Dirpath  :=
           new String'(Get_Name_String (For_Project.Library_Dir.Display_Name));
         Lib_Filename := new String'
           (Get_Name_String (For_Project.Library_Name));

         case For_Project.Library_Kind is
            when Static =>
               The_Build_Mode := Static;

            when Dynamic =>
               The_Build_Mode := Dynamic;

            when Relocatable =>
               The_Build_Mode := Relocatable;

               if PIC_Option /= "" then
                  Opts.Increment_Last;
                  Opts.Table (Opts.Last) := new String'(PIC_Option);
               end if;
         end case;

         --  Get the library version, if any

         if For_Project.Lib_Internal_Name /= No_Name then
            Lib_Version :=
              new String'(Get_Name_String (For_Project.Lib_Internal_Name));
         end if;

         --  Add the objects found in the object directory and the object
         --  directories of the extended files, if any, except for generated
         --  object files (b~.. or B__..) from extended projects.
         --  When there are one or more extended files, only add an object file
         --  if no object file with the same name have already been added.

         In_Main_Object_Directory := True;

         --  For gnatmake, when the project specifies more than just Ada as a
         --  language (even if course we could not find any source file for
         --  the other languages), we will take all object files found in the
         --  object directories. Since we know the project supports at least
         --  Ada, we just have to test whether it has at least two languages,
         --  and not care about the sources.

         Foreign_Sources := For_Project.Languages.Next /= null;
         Current_Proj := For_Project;
         loop
            if Current_Proj.Object_Directory /= No_Path_Information then

               --  The following code gets far too indented, I suggest some
               --  procedural abstraction here. How about making this declare
               --  block a named procedure???

               declare
                  Object_Dir_Path : constant String :=
                                      Get_Name_String
                                        (Current_Proj.Object_Directory
                                         .Display_Name);

                  Object_Dir : Dir_Type;
                  Filename   : String (1 .. 255);
                  Last       : Natural;
                  Id         : Name_Id;

               begin
                  Open (Dir => Object_Dir, Dir_Name => Object_Dir_Path);

                  --  For all entries in the object directory

                  loop
                     Read (Object_Dir, Filename, Last);

                     exit when Last = 0;

                     --  Check if it is an object file

                     if Is_Obj (Filename (1 .. Last)) then
                        declare
                           Object_Path  : constant String :=
                                            Normalize_Pathname
                                              (Object_Dir_Path
                                               & Directory_Separator
                                               & Filename (1 .. Last));
                           Object_File  : constant String :=
                                            Filename (1 .. Last);

                           C_Filename    : String := Object_File;

                        begin
                           Canonical_Case_File_Name (C_Filename);

                           --  If in the object directory of an extended
                           --  project, do not consider generated object files.

                           if In_Main_Object_Directory
                             or else Last < 5
                             or else
                               C_Filename (1 .. B_Start'Length) /= B_Start.all
                           then
                              Name_Len := 0;
                              Add_Str_To_Name_Buffer (C_Filename);
                              Id := Name_Find;

                              if not Objects_Htable.Get (Id) then
                                 declare
                                    ALI_File : constant String :=
                                                 Ext_To (C_Filename, "ali");

                                    ALI_Path : constant String :=
                                                 Ext_To (Object_Path, "ali");

                                    Add_It : Boolean;
                                    Fname  : File_Name_Type;
                                    Proj   : Project_Id;
                                    Index  : Unit_Index;

                                 begin
                                    --  The following assignment could use
                                    --  a comment ???

                                    Add_It :=
                                      Foreign_Sources
                                        or else
                                          (Last >= 5
                                             and then
                                               C_Filename (1 .. B_Start'Length)
                                                 = B_Start.all);

                                    if Is_Regular_File (ALI_Path) then

                                       --  If there is an ALI file, check if
                                       --  the object file should be added to
                                       --  the library. If there are foreign
                                       --  sources we put all object files in
                                       --  the library.

                                       if not Add_It then
                                          Index :=
                                            Units_Htable.Get_First
                                             (In_Tree.Units_HT);
                                          while Index /= null loop
                                             if Index.File_Names (Impl) /=
                                               null
                                             then
                                                Proj :=
                                                  Index.File_Names (Impl)
                                                  .Project;
                                                Fname :=
                                                  Index.File_Names (Impl).File;

                                             elsif Index.File_Names (Spec) /=
                                               null
                                             then
                                                Proj :=
                                                  Index.File_Names (Spec)
                                                  .Project;
                                                Fname :=
                                                  Index.File_Names (Spec).File;

                                             else
                                                Proj := No_Project;
                                             end if;

                                             Add_It := Proj /= No_Project;

                                             --  If the source is in the
                                             --  project or a project it
                                             --  extends, we may put it in
                                             --  the library.

                                             if Add_It then
                                                Add_It := Check_Project (Proj);
                                             end if;

                                             --  But we don't, if the ALI file
                                             --  does not correspond to the
                                             --  unit.

                                             if Add_It then
                                                declare
                                                   F : constant String :=
                                                         Ext_To
                                                           (Get_Name_String
                                                              (Fname), "ali");
                                                begin
                                                   Add_It := F = ALI_File;
                                                end;
                                             end if;

                                             exit when Add_It;

                                             Index :=
                                               Units_Htable.Get_Next
                                                 (In_Tree.Units_HT);
                                          end loop;
                                       end if;

                                       if Add_It then
                                          Objects_Htable.Set (Id, True);
                                          Objects.Append
                                            (new String'(Object_Path));

                                          --  Record the ALI file

                                          ALIs.Append (new String'(ALI_Path));

                                          --  Find out if for this ALI file,
                                          --  libgnarl or libdecgnat or
                                          --  g-trasym.obj (on OpenVMS) is
                                          --  necessary.

                                          Check_Libs (ALI_Path, True);
                                       end if;

                                    elsif Foreign_Sources then
                                       Objects.Append
                                         (new String'(Object_Path));
                                    end if;
                                 end;
                              end if;
                           end if;
                        end;
                     end if;
                  end loop;

                  Close (Dir => Object_Dir);

               exception
                  when Directory_Error =>
                     Com.Fail ("cannot find object directory """
                               & Get_Name_String
                                  (Current_Proj.Object_Directory.Display_Name)
                               & """");
               end;
            end if;

            exit when Current_Proj.Extends = No_Project;

            In_Main_Object_Directory  := False;
            Current_Proj := Current_Proj.Extends;
         end loop;

         --  Add the -L and -l switches for the imported Library Project Files,
         --  and, if Path Option is supported, the library directory path names
         --  to Rpath.

         Process_Imported_Libraries;

         --  Link with libgnat and possibly libgnarl

         Opts.Increment_Last;
         Opts.Table (Opts.Last) := new String'("-L" & Lib_Directory);

         --  If Path Option is supported, add libgnat directory path name to
         --  Rpath.

         if Path_Option /= null then
            declare
               Libdir    : constant String := Lib_Directory;
               GCC_Index : Natural := 0;

            begin
               Add_Rpath (Libdir);

               --  For shared libraries, add to the Path Option the directory
               --  of the shared version of libgcc.

               if The_Build_Mode /= Static then
                  GCC_Index := Index (Libdir, "/lib/");

                  if GCC_Index = 0 then
                     GCC_Index :=
                       Index
                         (Libdir,
                          Directory_Separator & "lib" & Directory_Separator);
                  end if;

                  if GCC_Index /= 0 then
                     Add_Rpath (Libdir (Libdir'First .. GCC_Index + 3));
                  end if;
               end if;
            end;
         end if;

         if Libgnarl_Needed = Yes then
            Opts.Increment_Last;

            if The_Build_Mode = Static then
               Opts.Table (Opts.Last) := new String'("-lgnarl");
            else
               Opts.Table (Opts.Last) := new String'(Shared_Lib ("gnarl"));
            end if;
         end if;

         if Gtrasymobj_Needed then
            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'(Lib_Directory & "/g-trasym.obj");
         end if;

         if Libdecgnat_Needed then
            Opts.Increment_Last;

            Opts.Table (Opts.Last) :=
              new String'("-L" & Lib_Directory & "/../declib");

            Opts.Increment_Last;

            if The_Build_Mode = Static then
               Opts.Table (Opts.Last) := new String'("-ldecgnat");
            else
               Opts.Table (Opts.Last) := new String'(Shared_Lib ("decgnat"));
            end if;
         end if;

         Opts.Increment_Last;

         if The_Build_Mode = Static then
            Opts.Table (Opts.Last) := new String'("-lgnat");
         else
            Opts.Table (Opts.Last) := new String'(Shared_Lib ("gnat"));
         end if;

         --  If Path Option is supported, add the necessary switch with the
         --  content of Rpath. As Rpath contains at least libgnat directory
         --  path name, it is guaranteed that it is not null.

         if Path_Option /= null then
            Opts.Increment_Last;
            Opts.Table (Opts.Last) :=
              new String'(Path_Option.all & Rpath (1 .. Rpath_Last));
            Free (Path_Option);
            Free (Rpath);
         end if;

         Object_Files :=
           new Argument_List'
             (Argument_List (Objects.Table (1 .. Objects.Last)));

         Ali_Files :=
           new Argument_List'(Argument_List (ALIs.Table (1 .. ALIs.Last)));

         Options :=
           new Argument_List'(Argument_List (Opts.Table (1 .. Opts.Last)));

         --  We fail if there are no object to put in the library
         --  (Ada or foreign objects).

         if Object_Files'Length = 0 then
            Com.Fail ("no object files for library """ &
                      Lib_Filename.all & '"');
         end if;

         if not Opt.Quiet_Output then
            Write_Eol;
            Write_Str  ("building ");
            Write_Str (Ada.Characters.Handling.To_Lower
                         (Build_Mode_State'Image (The_Build_Mode)));
            Write_Str  (" library for project ");
            Write_Line (Project_Name);

            --  Only output list of object files and ALI files in verbose mode

            if Opt.Verbose_Mode then
               Write_Eol;

               Write_Line ("object files:");

               for Index in Object_Files'Range loop
                  Write_Str  ("   ");
                  Write_Line (Object_Files (Index).all);
               end loop;

               Write_Eol;

               if Ali_Files'Length = 0 then
                  Write_Line ("NO ALI files");

               else
                  Write_Line ("ALI files:");

                  for Index in Ali_Files'Range loop
                     Write_Str  ("   ");
                     Write_Line (Ali_Files (Index).all);
                  end loop;
               end if;

               Write_Eol;
            end if;
         end if;

         --  We check that all object files are regular files

         Check_Context;

         --  Delete the existing library file, if it exists. Fail if the
         --  library file is not writable, or if it is not possible to delete
         --  the file.

         declare
            DLL_Name : aliased String :=
                         Lib_Dirpath.all & Directory_Separator & DLL_Prefix &
                           Lib_Filename.all & "." & DLL_Ext;

            Archive_Name : aliased String :=
                             Lib_Dirpath.all & Directory_Separator & "lib" &
                               Lib_Filename.all & "." & Archive_Ext;

            type Str_Ptr is access all String;
            --  This type is necessary to meet the accessibility rules of Ada.
            --  It is not possible to use String_Access here.

            Full_Lib_Name : Str_Ptr;
            --  Designates the full library path name. Either DLL_Name or
            --  Archive_Name, depending on the library kind.

            Success : Boolean;
            pragma Warnings (Off, Success);
            --  Used to call Delete_File

         begin
            if The_Build_Mode = Static then
               Full_Lib_Name := Archive_Name'Access;
            else
               Full_Lib_Name := DLL_Name'Access;
            end if;

            if Is_Regular_File (Full_Lib_Name.all) then
               if Is_Writable_File (Full_Lib_Name.all) then
                  Delete_File (Full_Lib_Name.all, Success);
               end if;

               if Is_Regular_File (Full_Lib_Name.all) then
                  Com.Fail ("could not delete """ & Full_Lib_Name.all & """");
               end if;
            end if;
         end;

         Argument_Number := 0;

         --  If we have a standalone library, gather all the interface ALI.
         --  They are passed to Build_Dynamic_Library, where they are used by
         --  some platforms (VMS, for example) to decide what symbols should be
         --  exported. They are also flagged as Interface when we copy them to
         --  the library directory (by Copy_ALI_Files, below).

         if Standalone then
            Current_Proj := For_Project;

            declare
               Iface : String_List_Id := For_Project.Lib_Interface_ALIs;
               ALI   : File_Name_Type;

            begin
               while Iface /= Nil_String loop
                  ALI :=
                    File_Name_Type
                      (In_Tree.String_Elements.Table (Iface).Value);
                  Interface_ALIs.Set (ALI, True);
                  Get_Name_String
                    (In_Tree.String_Elements.Table (Iface).Value);
                  Add_Argument (Name_Buffer (1 .. Name_Len));
                  Iface := In_Tree.String_Elements.Table (Iface).Next;
               end loop;

               Iface := For_Project.Lib_Interface_ALIs;

               if not Opt.Quiet_Output then

                  --  Check that the interface set is complete: any unit in the
                  --  library that is needed by an interface should also be an
                  --  interface. If it is not the case, output a warning.

                  while Iface /= Nil_String loop
                     ALI :=
                       File_Name_Type
                         (In_Tree.String_Elements.Table (Iface).Value);
                     Process (ALI);
                     Iface := In_Tree.String_Elements.Table (Iface).Next;
                  end loop;
               end if;
            end;
         end if;

         declare
            Current_Dir  : constant String := Get_Current_Dir;
            Dir          : Dir_Type;

            Name : String (1 .. 200);
            Last : Natural;

            Disregard : Boolean;
            pragma Warnings (Off, Disregard);

            DLL_Name : aliased constant String :=
                         Lib_Filename.all & "." & DLL_Ext;

            Archive_Name : aliased constant String :=
                             Lib_Filename.all & "." & Archive_Ext;

            Delete : Boolean := False;

         begin
            --  Clean the library directory: remove any file with the name of
            --  the library file and any ALI file of a source of the project.

            begin
               Get_Name_String (For_Project.Library_Dir.Display_Name);
               Change_Dir (Name_Buffer (1 .. Name_Len));

            exception
               when others =>
                  Com.Fail
                    ("unable to access library directory """
                     & Name_Buffer (1 .. Name_Len)
                     & """");
            end;

            Open (Dir, ".");

            loop
               Read (Dir, Name, Last);
               exit when Last = 0;

               declare
                  Filename : constant String := Name (1 .. Last);

               begin
                  if Is_Regular_File (Filename) then
                     Canonical_Case_File_Name (Name (1 .. Last));
                     Delete := False;

                     if (The_Build_Mode = Static
                          and then Name (1 .. Last) =  Archive_Name)
                       or else
                         ((The_Build_Mode = Dynamic
                            or else
                           The_Build_Mode = Relocatable)
                          and then Name (1 .. Last) = DLL_Name)
                     then
                        Delete := True;

                     elsif Last > 4
                       and then Name (Last - 3 .. Last) = ".ali"
                     then
                        declare
                           Unit : Unit_Index;

                        begin
                           --  Compare with ALI file names of the project

                           Unit := Units_Htable.Get_First (In_Tree.Units_HT);
                           while Unit /= No_Unit_Index loop
                              if Unit.File_Names (Impl) /= null
                                and then Unit.File_Names (Impl).Project /=
                                                                 No_Project
                              then
                                 if Ultimate_Extending_Project_Of
                                      (Unit.File_Names (Impl).Project) =
                                                                 For_Project
                                 then
                                    Get_Name_String
                                      (Unit.File_Names (Impl).File);
                                    Name_Len :=
                                      Name_Len -
                                        File_Extension
                                          (Name (1 .. Name_Len))'Length;

                                    if Name_Buffer (1 .. Name_Len) =
                                      Name (1 .. Last - 4)
                                    then
                                       Delete := True;
                                       exit;
                                    end if;
                                 end if;

                              elsif Unit.File_Names (Spec) /= null
                                and then Ultimate_Extending_Project_Of
                                           (Unit.File_Names (Spec).Project) =
                                                                   For_Project
                              then
                                 Get_Name_String (Unit.File_Names (Spec).File);
                                 Name_Len :=
                                   Name_Len -
                                     File_Extension (Name (1 .. Last))'Length;

                                 if Name_Buffer (1 .. Name_Len) =
                                      Name (1 .. Last - 4)
                                 then
                                    Delete := True;
                                    exit;
                                 end if;
                              end if;

                              Unit := Units_Htable.Get_Next (In_Tree.Units_HT);
                           end loop;
                        end;
                     end if;

                     if Delete then
                        Set_Writable (Filename);
                        Delete_File (Filename, Disregard);
                     end if;
                  end if;
               end;
            end loop;

            Close (Dir);

            Change_Dir (Current_Dir);
         end;

         --  Call procedure to build the library, depending on the build mode

         case The_Build_Mode is
            when Dynamic | Relocatable =>
               Build_Dynamic_Library
                 (Ofiles        => Object_Files.all,
                  Options       => Options.all,
                  Interfaces    => Arguments (1 .. Argument_Number),
                  Lib_Filename  => Lib_Filename.all,
                  Lib_Dir       => Lib_Dirpath.all,
                  Symbol_Data   => Current_Proj.Symbol_Data,
                  Driver_Name   => Driver_Name,
                  Lib_Version   => Lib_Version.all,
                  Auto_Init     => Current_Proj.Lib_Auto_Init);

            when Static =>
               MLib.Build_Library
                 (Object_Files.all,
                  Lib_Filename.all,
                  Lib_Dirpath.all);

            when None =>
               null;
         end case;

         --  We need to copy the ALI files from the object directory to the
         --  library ALI directory, so that the linker find them there, and
         --  does not need to look in the object directory where it would also
         --  find the object files; and we don't want that: we want the linker
         --  to use the library.

         --  Copy the ALI files and make the copies read-only. For interfaces,
         --  mark the copies as interfaces.

         Copy_ALI_Files
           (Files      => Ali_Files.all,
            To         => For_Project.Library_ALI_Dir.Display_Name,
            Interfaces => Arguments (1 .. Argument_Number));

         --  Copy interface sources if Library_Src_Dir specified

         if Standalone
           and then For_Project.Library_Src_Dir /= No_Path_Information
         then
            --  Clean the interface copy directory: remove any source that
            --  could be a source of the project.

            begin
               Get_Name_String (For_Project.Library_Src_Dir.Display_Name);
               Change_Dir (Name_Buffer (1 .. Name_Len));

            exception
               when others =>
                  Com.Fail
                    ("unable to access library source copy directory """
                     & Name_Buffer (1 .. Name_Len)
                     & """");
            end;

            declare
               Dir    : Dir_Type;
               Delete : Boolean := False;
               Unit   : Unit_Index;

               Name : String (1 .. 200);
               Last : Natural;

               Disregard : Boolean;
               pragma Warnings (Off, Disregard);

            begin
               Open (Dir, ".");

               loop
                  Read (Dir, Name, Last);
                  exit when Last = 0;

                  if Is_Regular_File (Name (1 .. Last)) then
                     Canonical_Case_File_Name (Name (1 .. Last));
                     Delete := False;

                     --  Compare with source file names of the project

                     Unit := Units_Htable.Get_First (In_Tree.Units_HT);
                     while Unit /= No_Unit_Index loop
                        if Unit.File_Names (Impl) /= null
                          and then Ultimate_Extending_Project_Of
                            (Unit.File_Names (Impl).Project) = For_Project
                          and then
                            Get_Name_String
                              (Unit.File_Names (Impl).File) =
                            Name (1 .. Last)
                        then
                           Delete := True;
                           exit;
                        end if;

                        if Unit.File_Names (Spec) /= null
                          and then Ultimate_Extending_Project_Of
                            (Unit.File_Names (Spec).Project) =
                             For_Project
                          and then
                           Get_Name_String
                             (Unit.File_Names (Spec).File) =
                           Name (1 .. Last)
                        then
                           Delete := True;
                           exit;
                        end if;

                        Unit := Units_Htable.Get_Next (In_Tree.Units_HT);
                     end loop;
                  end if;

                  if Delete then
                     Set_Writable (Name (1 .. Last));
                     Delete_File (Name (1 .. Last), Disregard);
                  end if;
               end loop;

               Close (Dir);
            end;

            Copy_Interface_Sources
              (For_Project => For_Project,
               In_Tree     => In_Tree,
               Interfaces  => Arguments (1 .. Argument_Number),
               To_Dir      => For_Project.Library_Src_Dir.Display_Name);
         end if;
      end if;

      --  Reset the current working directory to its previous value

      Change_Dir (Current_Dir);
   end Build_Library;

   -----------
   -- Check --
   -----------

   procedure Check (Filename : String) is
   begin
      if not Is_Regular_File (Filename) then
         Com.Fail (Filename & " not found.");
      end if;
   end Check;

   -------------------
   -- Check_Context --
   -------------------

   procedure Check_Context is
   begin
      --  Check that each object file exists

      for F in Object_Files'Range loop
         Check (Object_Files (F).all);
      end loop;
   end Check_Context;

   -------------------
   -- Check_Library --
   -------------------

   procedure Check_Library
     (For_Project : Project_Id; In_Tree : Project_Tree_Ref)
   is
      Lib_TS  : Time_Stamp_Type;
      Current : constant Dir_Name_Str := Get_Current_Dir;

   begin
      --  No need to build the library if there is no object directory,
      --  hence no object files to build the library.

      if For_Project.Library then
         declare
            Lib_Name : constant File_Name_Type :=
                         Library_File_Name_For (For_Project, In_Tree);
         begin
            Change_Dir
              (Get_Name_String (For_Project.Library_Dir.Display_Name));
            Lib_TS := File_Stamp (Lib_Name);
            For_Project.Library_TS := Lib_TS;
         end;

         if not For_Project.Externally_Built
           and then not For_Project.Need_To_Build_Lib
           and then For_Project.Object_Directory /= No_Path_Information
         then
            declare
               Obj_TS     : Time_Stamp_Type;
               Object_Dir : Dir_Type;

            begin
               if OpenVMS_On_Target then
                  B_Start := new String'("b__");
               end if;

               --  If the library file does not exist, then the time stamp will
               --  be Empty_Time_Stamp, earlier than any other time stamp.

               Change_Dir
                 (Get_Name_String (For_Project.Object_Directory.Display_Name));
               Open (Dir => Object_Dir, Dir_Name => ".");

               --  For all entries in the object directory

               loop
                  Read (Object_Dir, Name_Buffer, Name_Len);
                  exit when Name_Len = 0;

                  --  Check if it is an object file, but ignore any binder
                  --  generated file.

                  if Is_Obj (Name_Buffer (1 .. Name_Len))
                    and then Name_Buffer (1 .. B_Start'Length) /= B_Start.all
                  then
                     --  Get the object file time stamp

                     Obj_TS := File_Stamp (File_Name_Type'(Name_Find));

                     --  If library file time stamp is earlier, set
                     --  Need_To_Build_Lib and return. String comparison is
                     --  used, otherwise time stamps may be too close and the
                     --  comparison would return True, which would trigger
                     --  an unnecessary rebuild of the library.

                     if String (Lib_TS) < String (Obj_TS) then

                        --  Library must be rebuilt

                        For_Project.Need_To_Build_Lib := True;
                        exit;
                     end if;
                  end if;
               end loop;

               Close (Object_Dir);
            end;
         end if;

         Change_Dir (Current);
      end if;
   end Check_Library;

   ----------------------------
   -- Copy_Interface_Sources --
   ----------------------------

   procedure Copy_Interface_Sources
     (For_Project : Project_Id;
      In_Tree     : Project_Tree_Ref;
      Interfaces  : Argument_List;
      To_Dir      : Path_Name_Type)
   is
      Current : constant Dir_Name_Str := Get_Current_Dir;
      --  The current directory, where to return to at the end

      Target : constant Dir_Name_Str := Get_Name_String (To_Dir);
      --  The directory where to copy sources

      Text     : Text_Buffer_Ptr;
      The_ALI  : ALI.ALI_Id;
      Lib_File : File_Name_Type;

      First_Unit  : ALI.Unit_Id;
      Second_Unit : ALI.Unit_Id;

      Copy_Subunits : Boolean := False;
      --  When True, indicates that subunits, if any, need to be copied too

      procedure Copy (File_Name : File_Name_Type);
      --  Copy one source of the project to the target directory

      ----------
      -- Copy --
      ----------

      procedure Copy (File_Name : File_Name_Type) is
         Success : Boolean;
         pragma Warnings (Off, Success);

         Source : Standard.Prj.Source_Id;
      begin
         Source := Find_Source
           (In_Tree, For_Project,
            In_Extended_Only => True,
            Base_Name => File_Name);

         if Source /= No_Source
           and then not Source.Locally_Removed
           and then Source.Replaced_By = No_Source
         then
            Copy_File
              (Get_Name_String (Source.Path.Name),
               Target,
               Success,
               Mode     => Overwrite,
               Preserve => Preserve);
         end if;
      end Copy;

   --  Start of processing for Copy_Interface_Sources

   begin
      --  Change the working directory to the object directory

      Change_Dir (Get_Name_String (For_Project.Object_Directory.Display_Name));

      for Index in Interfaces'Range loop

         --  First, load the ALI file

         Name_Len := 0;
         Add_Str_To_Name_Buffer (Interfaces (Index).all);
         Lib_File := Name_Find;
         Text := Read_Library_Info (Lib_File);
         The_ALI := Scan_ALI (Lib_File, Text, Ignore_ED => False, Err => True);
         Free (Text);

         Second_Unit := No_Unit_Id;
         First_Unit := ALI.ALIs.Table (The_ALI).First_Unit;
         Copy_Subunits := True;

         --  If there is both a spec and a body, check if they are both needed

         if ALI.Units.Table (First_Unit).Utype = Is_Body then
            Second_Unit := ALI.ALIs.Table (The_ALI).Last_Unit;

            --  If the body is not needed, then reset First_Unit

            if not ALI.Units.Table (Second_Unit).Body_Needed_For_SAL then
               First_Unit := No_Unit_Id;
               Copy_Subunits := False;
            end if;

         elsif ALI.Units.Table (First_Unit).Utype = Is_Spec_Only then
            Copy_Subunits := False;
         end if;

         --  Copy the file(s) that need to be copied

         if First_Unit /= No_Unit_Id then
            Copy (File_Name => ALI.Units.Table (First_Unit).Sfile);
         end if;

         if Second_Unit /= No_Unit_Id then
            Copy (File_Name => ALI.Units.Table (Second_Unit).Sfile);
         end if;

         --  Copy all the separates, if any

         if Copy_Subunits then
            for Dep in ALI.ALIs.Table (The_ALI).First_Sdep ..
              ALI.ALIs.Table (The_ALI).Last_Sdep
            loop
               if Sdep.Table (Dep).Subunit_Name /= No_Name then
                  Copy (File_Name => Sdep.Table (Dep).Sfile);
               end if;
            end loop;
         end if;
      end loop;

      --  Restore the initial working directory

      Change_Dir (Current);
   end Copy_Interface_Sources;

   -------------
   -- Display --
   -------------

   procedure Display (Executable : String) is
   begin
      if not Opt.Quiet_Output then
         Write_Str (Executable);

         for Index in 1 .. Argument_Number loop
            Write_Char (' ');
            Write_Str (Arguments (Index).all);

            if not Opt.Verbose_Mode and then Index > 4 then
               Write_Str (" ...");
               exit;
            end if;
         end loop;

         Write_Eol;
      end if;
   end Display;

   -----------
   -- Index --
   -----------

   function Index (S, Pattern : String) return Natural is
      Len : constant Natural := Pattern'Length;

   begin
      for J in reverse S'First .. S'Last - Len + 1 loop
         if Pattern = S (J .. J + Len - 1) then
            return J;
         end if;
      end loop;

      return 0;
   end Index;

   -------------------------
   -- Process_Binder_File --
   -------------------------

   procedure Process_Binder_File (Name : String) is
      Fd : FILEs;
      --  Binder file's descriptor

      Read_Mode : constant String := "r" & ASCII.NUL;
      --  For fopen

      Status : Interfaces.C_Streams.int;
      pragma Unreferenced (Status);
      --  For fclose

      Begin_Info : constant String := "--  BEGIN Object file/option list";
      End_Info   : constant String := "--  END Object file/option list   ";

      Next_Line : String (1 .. 1000);
      --  Current line value
      --  Where does this odd constant 1000 come from, looks suspicious ???

      Nlast : Integer;
      --  End of line slice (the slice does not contain the line terminator)

      procedure Get_Next_Line;
      --  Read the next line from the binder file without the line terminator

      -------------------
      -- Get_Next_Line --
      -------------------

      procedure Get_Next_Line is
         Fchars : chars;

      begin
         Fchars := fgets (Next_Line'Address, Next_Line'Length, Fd);

         if Fchars = System.Null_Address then
            Fail ("Error reading binder output");
         end if;

         Nlast := 1;
         while Nlast <= Next_Line'Last
           and then Next_Line (Nlast) /= ASCII.LF
           and then Next_Line (Nlast) /= ASCII.CR
         loop
            Nlast := Nlast + 1;
         end loop;

         Nlast := Nlast - 1;
      end Get_Next_Line;

   --  Start of processing for Process_Binder_File

   begin
      Fd := fopen (Name'Address, Read_Mode'Address);

      if Fd = NULL_Stream then
         Fail ("Failed to open binder output");
      end if;

      --  Skip up to the Begin Info line

      loop
         Get_Next_Line;
         exit when Next_Line (1 .. Nlast) = Begin_Info;
      end loop;

      --  Find the first switch

      loop
         Get_Next_Line;

         exit when Next_Line (1 .. Nlast) = End_Info;

         --  As the binder generated file is in Ada, remove the first eight
         --  characters "   --   ".

         Next_Line (1 .. Nlast - 8) := Next_Line (9 .. Nlast);
         Nlast := Nlast - 8;

         --  Stop when the first switch is found

         exit when Next_Line (1) = '-';
      end loop;

      if Next_Line (1 .. Nlast) /= End_Info then
         loop
            --  Ignore -static and -shared, since -shared will be used
            --  in any case.

            --  Ignore -lgnat, -lgnarl and -ldecgnat as they will be added
            --  later, because they are also needed for non Stand-Alone shared
            --  libraries.

            --  Also ignore the shared libraries which are :

            --  UNIX / Windows    VMS
            --  -lgnat-<version>  -lgnat_<version>  (7 + version'length chars)
            --  -lgnarl-<version> -lgnarl_<version> (8 + version'length chars)

            if Next_Line (1 .. Nlast) /= "-static" and then
               Next_Line (1 .. Nlast) /= "-shared" and then
               Next_Line (1 .. Nlast) /= "-ldecgnat" and then
               Next_Line (1 .. Nlast) /= "-lgnarl" and then
               Next_Line (1 .. Nlast) /= "-lgnat" and then
               Next_Line
                 (1 .. Natural'Min (Nlast, 10 + Library_Version'Length)) /=
                   Shared_Lib ("decgnat") and then
               Next_Line
                 (1 .. Natural'Min (Nlast, 8 + Library_Version'Length)) /=
                   Shared_Lib ("gnarl") and then
               Next_Line
                 (1 .. Natural'Min (Nlast, 7 + Library_Version'Length)) /=
                   Shared_Lib ("gnat")
            then
               if Next_Line (1) /= '-' then

                  --  This is not an option, should we add it?

                  if Add_Object_Files then
                     Opts.Increment_Last;
                     Opts.Table (Opts.Last) :=
                       new String'(Next_Line (1 .. Nlast));
                  end if;

               else
                  --  Add all other options

                  Opts.Increment_Last;
                  Opts.Table (Opts.Last) :=
                    new String'(Next_Line (1 .. Nlast));
               end if;
            end if;

            --  Next option, if any

            Get_Next_Line;
            exit when Next_Line (1 .. Nlast) = End_Info;

            --  Remove first eight characters "   --   "

            Next_Line (1 .. Nlast - 8) := Next_Line (9 .. Nlast);
            Nlast := Nlast - 8;
         end loop;
      end if;

      Status := fclose (Fd);

      --  Is it really right to ignore any close error ???

   end Process_Binder_File;

   ------------------
   -- Reset_Tables --
   ------------------

   procedure Reset_Tables is
   begin
      Objects.Init;
      Objects_Htable.Reset;
      ALIs.Init;
      Opts.Init;
      Processed_Projects.Reset;
      Library_Projs.Init;
   end Reset_Tables;

   ---------------------------
   -- SALs_Use_Constructors --
   ---------------------------

   function SALs_Use_Constructors return Boolean is
      function C_SALs_Init_Using_Constructors return Integer;
      pragma Import (C, C_SALs_Init_Using_Constructors,
                     "__gnat_sals_init_using_constructors");
   begin
      return C_SALs_Init_Using_Constructors /= 0;
   end SALs_Use_Constructors;

end MLib.Prj;