fhahn added a comment. I had to revert this, as libstdc++ 4.8 does not have the is_trivially_XXX<T> helpers https://gcc.gnu.org/onlinedocs/gcc-4.8.3/libstdc++/manual/manual/status.html#status.iso.2011 :( Repository: rL LLVM https://reviews.llvm.org/D47942