On 05/24/18 14:12, Nick Desaulniers wrote: > > Looks like those builtins got added to GCC around the 4.9 timeframe: > https://godbolt.org/g/9VS2E9 > > Problematically, it seems that GCC does not have __has_builtin to do > feature detection: > https://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros > https://godbolt.org/g/oku8ux >
We have support in the kernel build system for doing that, though. I just added a concurring opinion to the gcc bug report: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66970
