https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122645
Bug ID: 122645
Summary: Code breaks between 15.2 and 16.0
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: eczbek.void at gmail dot com
Target Milestone: ---
https://godbolt.org/z/e8E7d9s3E
This code runs fine when compiled with GCC 15.2 but segfaults when compiled
with GCC 16.0
```
#include <stdint.h>
typedef struct {
const uint16_t mov1;
const uint32_t addr;
const uint16_t mov2;
const void* const chain;
} __attribute__((packed)) thunk_struct;
int main() {
struct { void(*fun)(void*, int); } e;
if (!({
__label__ trgt;
int xsetjmp_ret = 0;
void jmp(void* self, int r) {
if (self != jmp) {
__builtin_call_with_static_chain(
((typeof(jmp)*)(intptr_t)((thunk_struct*)self)->addr)(self, r),
((thunk_struct*)self)->chain
);
}
xsetjmp_ret = r ? r : 1;
goto trgt;
}
e.fun = jmp;
trgt:;
xsetjmp_ret;
})) {
((typeof(e.fun))(intptr_t)((thunk_struct*)(void*)e.fun)->addr)(e.fun, 1);
}
}
```
