Re: [Tinycc-devel] Miscompiled code (when building GCC)

[Herman ten Brugge]

On 4/29/24 23:29, Andrius Štikonas wrote:
> Hi,
>
> When trying to compile gcc, we stumbled upon strange segfault that seem to be
> coming from tcc.
>
> This is the reproducer:
>
> struct thing {
>      unsigned index;
>      char mem[1];
> };
>
> struct function {
>      struct thing* t;
> };
>
> static inline struct thing* obtain (const struct function *f) {
>      return f->t;
> }
>
> int main () {
>      char *ptr;
>      struct thing u = {.index = 0, .mem = {'a'}};
>      struct function g = {.t = &u};
>      struct function *f = &g;
>      ptr = &(obtain(f)->mem[obtain(f)->index]);
>      return *ptr;
> }

I pushed a fix for this on mob.

    Herman