https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61407
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #1) > Looks like the Mac OS X's headers are not C99/C++98 compatible at all: > > /Applications/Xcode6-Beta.app/Contents/Developer/Platforms/MacOSX.platform/ > Developer/SDKs/MacOSX10.10.sdk/usr/include/Availability.h:174:44: error: > missing binary operator before token "(" > #if defined(__has_feature) && > __has_feature(attribute_availability_with_message) > ^ This error is correct because with the preprocessor && does not short cutting if the first operand is true. So look like we need a fixincludes of this issue. You should also report this bug to Apple too since their headers don't support C99/C++98 preprocessors correctly.