search for: __gcc_gnu_inline__

...gt; >[0] https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute >[1] >https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#Common-Function-Attributes >[2] https://bugs.llvm.org/show_bug.cgi?id=37784 Please fix clang. It isn't all that hard to fix. However, __GCC_GNU_INLINE__ means you are in GNU mode by default, on gcc's new enough to have multiple misses. The right thing to look for is __GCC_STDC_INLINE__ in which case you need the attribute. By the way, you should check clang against gcc's predefined macros by doing: gcc [options] -x c -Wp,-dM -E /dev/null...