https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69152
--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> --- This macro is about the typedef _WordT in bitset (currently "long", so __SIZEOF_LONG__ is exactly what we want), not about the compiler notion of "word". Using "long" for that typedef is suboptimal on x32, but also on win64. I think there is already a PR asking to change it, but since it would break the ABI...
