https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77691
--- Comment #46 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to John David Anglin from comment #45) > It seems we have 8-byte alignment specified using std::max_align_t and > 16-byte > alignment for pthread mutexes and malloc. That's not a libstdc++ issue though. std::max_align_t isn't defined by libstdc++, it comes from GCC's stddef.h
