kees added a comment.
In D126864#3564519 <https://reviews.llvm.org/D126864#3564519>, @efriedma wrote:
> Do we want some builtin define so headers can check if we're in
> -fstrict-flex-arrays mode? It might be hard to mess with the definitions
> otherwise.
Hm, maybe? It wonder if that's more confusing, as code would need to do really
careful management of allocation sizes.
struct foo {
u32 len;
#ifndef STRICT_FLEX_ARRAYS
u32 array[14];
#else
u32 array[];
#endif
};
`sizeof(struct foo)` will change. Or, even more ugly:
struct foo {
union {
struct {
u32 len_old;
u32 array_old[14];
};
struct {
u32 len;
u32 array[];
};
};
};
But then `sizeof(struct foo)` stays the same.
(FWIW, the kernel is effectively doing the latter without any define.)
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https://reviews.llvm.org/D126864/new/
https://reviews.llvm.org/D126864
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