[Bug tree-optimization/124148] Potential faulty strict aliasing check ending up with wrong dead store elimination (DSE)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124148

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note GCC's fix for this looks more complex because of the GCC has a program
which generates marker functions from the type (GTY) and vec can be in the GC
memory.


But the correct fix is to do:

typedef struct ChainBase {
    ChainType sType;
    const void *pNext;
} ChainBase;

typedef struct A {
    ChainBase base;
    uint32_t dummy;
} A;

typedef struct B {
    ChainBase base;
    uint32_t dummy;
} B;