https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83531
Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2017-12-21 Ever confirmed|0 |1 --- Comment #1 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> --- Let's note that this issue breaks bootstrap on GCC 5, but it can also be triggered on any other compiler, including GCC 6 and 7, although for some reason there it doesn't occur during bootstrap (the libsanitizer code is different there). $ cat a.c #include <CoreFoundation/CFBase.h> $ gcc-7 a.c In file included from a.c:1:0: /System/Library/Frameworks/CoreFoundation.framework/Headers/CFBase.h: In function 'CFAutorelease': /System/Library/Frameworks/CoreFoundation.framework/Headers/CFBase.h:663:61: error: expected declaration specifiers before 'API_AVAILABLE' CFTypeRef CFAutorelease(CFTypeRef CF_RELEASES_ARGUMENT arg) API_AVAILABLE(macos(10.9), ios(7.0), watchos(2.0), tvos(9.0)); ^~~~~~~~~~~~~