https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71767
--- Comment #43 from Jack Howarth <howarth.at.gcc at gmail dot com> --- (In reply to Eric Gallager from comment #33) > I'm not sure if this is due to the patches from this bug report, or if it's > due to some other change made to GCC recently, but my fork of Emacs now > fails to build with LTO due to a bunch of undefined local symbols: > This issue appears to be PR57438 because passing -D__builtin_unreachable=__builtin_trap to the build on OS X 10.11 allows emac 25.1 to build against the Xcode 8.1 GM linker using stock gcc 6.2.0 compiler with... $ ../configure --enable-link-time-optimization --without-ns CC=/sw/bin/gcc-fsf-6 CXX=/sw/bin/g++-fsf-6 CPPFLAGS="-D__builtin_unreachable=__builtin_trap -I/sw/include" LDFLAGS="-L/sw/lib"
