https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69725
--- Comment #9 from Martin Sebor <msebor at gcc dot gnu.org> --- Just to make a record of my last attempt before I sign off for the day, the following still fails with the __gmpn_get_d error. I'll try your other suggestion and --disable-werror tomorrow to see how far that gets. This is all on Fedora 23 x86_64. $ rm -rf * $ /src/gcc/trunk/configure --enable-languages=c,c++,fortran,go,lto,obj-c++ --enable-checking=release --disable-werror --with-build-config=bootstrap-lto ... $ nice time make -j10 BOOT_CFLAGS='-O2' profiledbootstrap ... get_d.c: In function '__gmpn_get_d': get_d.c:490:1: error: the control flow of function '__gmpn_get_d' does not match its profile data (counter 'arcs') [-Werror=coverage-mismatch] } ^ get_d.c:490:1: error: the control flow of function '__gmpn_get_d' does not match its profile data (counter 'time_profiler') [-Werror=coverage-mismatch] cc1: some warnings being treated as errors
