https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71767
--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Just an FYI... Clang 3.7 and below do not witness the problem. > Clang 3.8 and above do. > ... Thanks for the tip, but I don't use MacPorts. I am building and testing gcc myself with the Apple's tools with a previous version of gcc (currently r240001) as the bootstrap compiler (to build Ada).