[Bug libstdc++/69744] OpenBSD does not define max_align_t

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69744

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> stddef.h is provided by GCC itself and thus likely needs "fixing" for OpenBSD
> (see gcc/ginclude/stddef.h)

Yeah, for some reason that header isn't used for this target:

# 1
"/home/vext01/research/warmup_experiment/work/gcc/sd_build/x86_64-unknown-openbsd5.8/libstdc++-v3/include/cstddef"
1
# 42
"/home/vext01/research/warmup_experiment/work/gcc/sd_build/x86_64-unknown-openbsd5.8/libstdc++-v3/include/cstddef"

# 43
"/home/vext01/research/warmup_experiment/work/gcc/sd_build/x86_64-unknown-openbsd5.8/libstdc++-v3/include/cstddef"
3


# 1
"/home/vext01/research/warmup_experiment/work/gcc/sd_build/gcc/include-fixed/stddef.h"
1 3 4
# 54
"/home/vext01/research/warmup_experiment/work/gcc/sd_build/gcc/include-fixed/stddef.h"
3 4
typedef long int ptrdiff_t;
# 80
"/home/vext01/research/warmup_experiment/work/gcc/sd_build/gcc/include-fixed/stddef.h"
3 4
typedef __wint_t wint_t;




typedef __mbstate_t mbstate_t;
# 46
"/home/vext01/research/warmup_experiment/work/gcc/sd_build/x86_64-unknown-openbsd5.8/libstdc++-v3/include/cstddef"
2 3


namespace std
{

  using ::max_align_t;
}


Does include-fixed/stddef.h take priority over GCC's own stddef.h ?