Hi, Running libc++ 3.4 rc1 "testit" on 32-bit Linux fails for test: test/language.support/support.types/max_align_t.pass.cpp max_align_t is typedef'd to "long double" type in <cstddef>. But... alignment_of(long double)=4, sizeof(long double)=12 alignment_of(long long)=8, sizeof(long long)=8 Thanks, Kal