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| author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
|---|---|---|
| committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
| commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
| tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/testsuite/gcc.dg/c99-const-expr-14.c | |
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Diffstat (limited to 'gcc/testsuite/gcc.dg/c99-const-expr-14.c')
| -rw-r--r-- | gcc/testsuite/gcc.dg/c99-const-expr-14.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/c99-const-expr-14.c b/gcc/testsuite/gcc.dg/c99-const-expr-14.c new file mode 100644 index 000000000..0c4f1b69b --- /dev/null +++ b/gcc/testsuite/gcc.dg/c99-const-expr-14.c @@ -0,0 +1,35 @@ +/* Test for constant expressions: cases involving VLAs, at file scope. */ +/* Origin: Joseph Myers <joseph@codesourcery.com> */ +/* { dg-do compile } */ +/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */ + +/* It appears address constants may contain casts to variably modified + types. Whether they should be permitted was discussed in + <http://groups.google.com/group/comp.std.c/msg/923eee5ab690fd98> + <LV7g2Vy3ARF$Ew9Q@romana.davros.org>; since static pointers to VLAs + are definitely permitted within functions and may be initialized + and such initialization involves implicit conversion to a variably + modified type, allowing explicit casts seems appropriate. Thus, + GCC allows them as long as the "evaluated" size expressions do not + contain the various operators not permitted to be evaluated in a + constant expression, and as long as the result is genuinely + constant (meaning that pointer arithmetic using the size of the VLA + is generally not permitted). */ + +static int sa[100]; + +volatile int nv; +int m; +int n; +int f (int, int); + +static int (*a2)[] = (int (*)[n])sa; +static int (*a8)[] = (int (*)[(m=n)])sa; /* { dg-error "constant" } */ +static int (*a9)[] = (int (*)[(m+=n)])sa; /* { dg-error "constant" } */ +static int (*a10)[] = (int (*)[f(m,n)])sa; /* { dg-error "constant" } */ +static int (*a11)[] = (int (*)[(m,n)])sa; /* { dg-error "constant" } */ +static int (*a12)[] = (int (*)[sizeof(int[n])])sa; +static int (*a13)[] = (int (*)[sizeof(int[m++])])sa; /* { dg-error "constant" } */ +static int (*a15)[] = (int (*)[sizeof(*(int (*)[n])sa)])sa; +static int (*a16)[] = (int (*)[sizeof(*(int (*)[m++])sa)])sa; /* { dg-error "constant" } */ +static int (*a17)[] = (int (*)[nv])sa; |