https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81361
--- Comment #18 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- With the patch in comment 7 applied on top of r252799, I have bootstrapped x86_64-apple-darwin16.7.0, configured with: ../work/configure --prefix=/opt/gcc/gcc8w --enable-languages=c,c++,fortran,objc,obj-c++,ada,lto --with-gmp=/opt/mp-new --with-system-zlib --with-isl=/opt/mp-new --enable-lto --enable-plugin --with-arch=corei7 --with-cpu=corei7 and check-ada gives === acats Summary === # of expected passes 2320 # of unexpected failures 0 === gnat Summary === # of expected passes 2600 # of expected failures 24 # of unsupported tests 7 Thanks for working on the issue. For the record % as --version Apple LLVM version 8.1.0 (clang-802.0.42) Target: x86_64-apple-darwin16.7.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin