36 lines
1.7 KiB
C
36 lines
1.7 KiB
C
/* Test for constant expressions: cases involving VLAs, at file scope. */
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/* Origin: Joseph Myers <joseph@codesourcery.com> */
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/* { dg-do compile } */
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/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
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/* It appears address constants may contain casts to variably modified
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types. Whether they should be permitted was discussed in
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<http://groups.google.com/group/comp.std.c/msg/923eee5ab690fd98>
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<LV7g2Vy3ARF$Ew9Q@romana.davros.org>; since static pointers to VLAs
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are definitely permitted within functions and may be initialized
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and such initialization involves implicit conversion to a variably
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modified type, allowing explicit casts seems appropriate. Thus,
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GCC allows them as long as the "evaluated" size expressions do not
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contain the various operators not permitted to be evaluated in a
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constant expression, and as long as the result is genuinely
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constant (meaning that pointer arithmetic using the size of the VLA
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is generally not permitted). */
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static int sa[100];
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volatile int nv;
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int m;
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int n;
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int f (int, int);
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static int (*a2)[] = (int (*)[n])sa;
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static int (*a8)[] = (int (*)[(m=n)])sa; /* { dg-error "constant" } */
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static int (*a9)[] = (int (*)[(m+=n)])sa; /* { dg-error "constant" } */
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static int (*a10)[] = (int (*)[f(m,n)])sa; /* { dg-error "constant" } */
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static int (*a11)[] = (int (*)[(m,n)])sa; /* { dg-error "constant" } */
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static int (*a12)[] = (int (*)[sizeof(int[n])])sa;
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static int (*a13)[] = (int (*)[sizeof(int[m++])])sa; /* { dg-error "constant" } */
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static int (*a15)[] = (int (*)[sizeof(*(int (*)[n])sa)])sa;
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static int (*a16)[] = (int (*)[sizeof(*(int (*)[m++])sa)])sa; /* { dg-error "constant" } */
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static int (*a17)[] = (int (*)[nv])sa;
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