1 files changed, 118 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/cpp/paste2.c b/gcc/testsuite/gcc.dg/cpp/paste2.c
new file mode 100644
index 000000000..788e4eb51
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/cpp/paste2.c
@@ -0,0 +1,118 @@
+/* Copyright (C) 2000 Free Software Foundation, Inc.  */
+
+/* { dg-do run } */
+/* { dg-options "-std=c99 -pedantic-errors" } */
+
+/* Test ## behavior and corner cases thoroughly.  The macro expander
+   failed many of these during development.  */
+
+#ifndef __WCHAR_TYPE__
+#define __WCHAR_TYPE__ int
+#endif
+typedef __WCHAR_TYPE__ wchar_t;
+
+extern int strcmp (const char *, const char *);
+extern int puts (const char *);
+extern void abort (void);
+#define err(str) do { puts(str); abort(); } while (0)
+
+#define EMPTY
+#define str(x) #x
+#define xstr(x) str(x)
+#define glue(x, y) x ## y
+#define xglue(x, y) glue (x, y)
+#define glue3(x, y, z) x ## y ## z
+#define glue_var(x, ...) x ## __VA_ARGS__
+
+#define __muldi3 __NDW(mul, 3 = 50)
+#define __NDW(a,b) __ ## a ## di ## b
+#define m3 NDW()
+#define NDW(x) m3 ## x = 50
+#define five 5
+#define fifty int fif ## ty
+
+/* Defines a function called glue, returning what it is passed.  */
+int glue (glue,) (int x)
+{
+  return x;
+}
+
+int main ()
+{
+  /* m3 and __muldi3 would sometimes cause an infinite loop.  Ensure
+     we only expand fifty once.  */
+  fifty = 50, m3, __muldi3;
+
+  /* General glue and macro expanding test.  */
+  int five0 = xglue (glue (fi, ve), 0);
+
+  /* Tests only first and last tokens are pasted, and pasting to form
+     the != operator.  Should expand to: if (five0 != 50).  */
+  if (glue3 (fi, ve0 !,= glue (EMPTY 5, 0)))
+    err ("five0 != 50");
+
+  /* Test varags pasting, and pasting to form the >> operator.  */
+  if (glue_var(50 >, > 1 != 25))
+    err ("Operator >> pasting");
+
+  /* The LHS should not attempt to expand twice, and thus becomes a
+     call to the function glue.  */
+  if (glue (gl, ue) (12) != 12)
+    err ("Recursive macros");
+
+  /* Test placemarker pasting.  The glued lines should all appear
+     neatly in the same column and below each other, though we don't
+     test that here.  */
+  {
+    int glue3(a, b, ) = 1, glue3(a,,) = 1;
+    glue3(a, , b)++;
+    glue3(, a, b)++;
+    glue3(,a,)++;
+    glue3(,,a)++;
+    if (a != 3 || ab != 3 glue3(,,))
+      err ("Placemarker pasting");
+  }
+
+  /* Test that macros in arguments are not expanded.  */
+  {
+    int glue (EMPTY,1) = 123, glue (T, EMPTY) = 123;
+    if (EMPTY1 != 123 || TEMPTY != 123)
+      err ("Pasted arguments macro expanding");
+  }
+
+  /* Test various paste combinations.  */
+  {
+    const wchar_t* wc_array = glue(L, "wide string");
+    wchar_t wc = glue(L, 'w');
+    const char * hh = xstr(xglue(glue(%, :), glue(%, :)));
+    int array glue (<, :) 1 glue (:, >) = glue(<, %) 1 glue(%, >);
+    int x = 4;
+
+    if (array[0] != 1)
+      err ("Digraph pasting");
+
+    x glue (>>, =) 1;		/* 2 */
+    x glue (<<, =) 1;		/* 4 */
+    x glue (*, =) 2;		/* 8 */
+    x glue (+, =) 100;		/* 108 */
+    x glue (-, =) 50;		/* 58 */
+    x glue (/, =) 2;		/* 29 */
+    x glue (%, =) 20;		/* 9 */
+    x glue (&, =) 254;		/* 8 */
+    x glue (|, =) 16;		/* 24 */
+    x glue (^, =) 18;		/* 10 */
+    
+    if (x != 10 || 0 glue (>, =) 1 glue (|, |) 1 glue (<, =) 0)
+      err ("Various operator pasting");
+    if (strcmp (hh, "%:%:"))
+      err ("Pasted digraph spelling");
+    if ((glue (., 1) glue (!, =) .1))
+      err ("Pasted numbers 1");
+    /* glue3 here will only work if we paste left-to-right.  If a
+       future implementation does not do this, change the test.  */
+    if (glue3 (1.0e, +, 1) != 10.0)
+      err ("Pasted numbers 2");
+  }
+
+  return 0;
+}