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/* Test to verify that -Wzero-length-bounds and not -Warray-bounds is
issued for accesses to interior zero-length array members that are
within the bounds of the enclosing struct.
{ dg-do compile }
{ dg-options "-O2 -Wall -fno-tree-vectorize" } */
void sink (void*);
struct A { int i; };
struct B { int j; struct A a[0]; };
struct C
{
struct B b1;
struct B b2;
};
char cbuf1[1 * sizeof (struct C)];
char cbuf2[2 * sizeof (struct C)] = { };
void test_C_global_buf (void)
{
struct C *p = (struct C*)&cbuf1;
p->b1.a[-1].i = 0; // { dg-warning "\\\[-Warray-bounds" }
p->b1.a[ 0].i = 0; // { dg-warning "\\\[-Wzero-length-bounds" }
p->b1.a[ 1].i = 0; // { dg-warning "\\\[-Warray-bounds" }
sink (p);
p->b2.a[ 0].i = 0; // { dg-warning "\\\[-Warray-bounds" }
p->b2.a[ 1].i = 0; // { dg-warning "\\\[-Warray-bounds" }
sink (p);
p = (struct C*)&cbuf2;
p->b1.a[-1].i = 0; // { dg-warning "\\\[-Warray-bounds" }
p->b1.a[ 0].i = 0; // { dg-warning "\\\[-Wzero-length-bounds" }
p->b1.a[ 1].i = 0; // { dg-warning "\\\[-Wzero-length-bounds" }
sink (p);
p->b2.a[ 0].i = 0;
p->b2.a[ 1].i = 0;
p->b2.a[ 2].i = 0; // { dg-warning "\\\[-Warray-bounds" }
p->b2.a[ 3].i = 0; // { dg-warning "\\\[-Warray-bounds" }
sink (p);
}
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