https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83531
Bug ID: 83531
Summary: Build broken on macOS 10.13.2
Product: gcc
Version: 5.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: fxcoudert at gcc dot gnu.org
Target Milestone: ---
Build of GCC 5 is currently broken on x86_64-apple-darwin17.3.0 (macOS 10.13.2)
because of a failure in building libsanitizer:
In file included from ../../../../libsanitizer/asan/asan_malloc_mac.cc:17:0:
/System/Library/Frameworks/CoreFoundation.framework/Headers/CFBase.h:663:61:
error: expected initializer before 'API_AVAILABLE'
CFTypeRef CFAutorelease(CFTypeRef CF_RELEASES_ARGUMENT arg)
API_AVAILABLE(macos(10.9), ios(7.0), watchos(2.0), tvos(9.0));
The failure comes from the header file CoreFoundation/CFBase.h, which uses the
API_AVAILABLE macro, which should be defined in /usr/include/os/availability.h
but isn't: in that system header, the path followed by any non-clang compiler
(such as GCC) ends up defining
__API_AVAILABLE/__API_DEPRECATED/__API_DEPRECATED_WITH_REPLACEMENT/__API_UNAVAILABLE
where it should define the corresponding API_AVAILABLE/etc macros (without
leading underscores).
I reported this bug to Apple (radar #36176941). Hopefully, they will fix their
system headers. In the mean time, we can get bootstrap working again by
fixinclud'ing the header in question. Patch to do so is available at
https://github.com/Homebrew/formula-patches/blob/master/gcc%405/10.13_headers.patch
