[Bug c/97321] add warning for pointer casts that may lead to aliasing violation when dereferenced

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97321

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
> gcc t5.c -O2 -Wstrict-aliasing=2
t5.c: In function 'g':
t5.c:5:32: warning: dereferencing type-punned pointer will break
strict-aliasing rules [-Wstrict-aliasing]
    5 |     return f((unsigned char **)&p);
      |                                ^~

so it already works.