| /* { dg-do compile } |
| * { dg-options "-std=c23 -O2" } |
| */ |
| |
| /* The structs are incompatible so can be assumed not to |
| * alias, but this is not exploited. So do not check for |
| * this below but check the error about incompatibility. */ |
| |
| struct bar { int x; int f[]; }; |
| |
| int test_bar3(struct bar* a, void* b) |
| { |
| a->x = 1; |
| |
| struct bar { int x; int f[1]; }* p = b; |
| struct bar* q = a; /* { dg-error "incompatible" } */ |
| p->x = 2; |
| |
| return a->x; |
| } |
| |
| |
| int main() |
| { |
| struct bar z; |
| |
| // allow both results here |
| int r = test_bar3(&z, &z); |
| |
| // UB but could be expected to return 1 with optimization |
| // exploiting the UB (not done at time of writing) or 2 |
| |
| return r; |
| } |
| |
| |
