Our GNU libstdc++ headers enable float128 types on at least i386 and amd64. Clang/NetBSD using libstdc++ is not prepared to use these types, it results in build failures of popular applications like CMake. Solutions: 1. Teach Clang to use float128 [Functional and pending patch has been submitted upstream] 2. Restrict float128 in libstdc++ to GCC (or at least disable on Clang) /usr/include/g++/bits/*/c++config.h #if !defined(__clang__) /* Define if __float128 is supported on this host. */ #define _GLIBCXX_USE_FLOAT128 1 #endif 3. Disable float128 in libstdc++ for everybody. The first solution is being rejected by Joerg on LLVM review as there might be incomplete support in lib[std]c++. I have no personal preference which way to go. Other systems go for (1.) [OpenBSD, Linux, Cygwin etc.].
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