https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90330
--- Comment #18 from Iain Sandoe <iains at gcc dot gnu.org> --- FWIW: this was my clang-bootstrapped test of the release candidate: https://gcc.gnu.org/ml/gcc-testresults/2019-08/msg00645.html --prefix=/opt/iains/x86_64-apple-darwin18/gcc-9-wip --with-sysroot=/opt/iains/SDKs/darwin18-2 --enable-languages=all CC='clang --sysroot=/opt/iains/SDKs/darwin18' CXX='clang++ --sysroot=/opt/iains/SDKs/darwin18' NOTE: if you have the command line tools installed you do not need to specify CC and CXX. The "--with-sysroot=/opt/iains/SDKs/darwin18-2 " is pointing to exactly the same SDK you have. i.e. I would expect --prefix=/somewhere/you/want/it --with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk to be completely sufficient. (will review your comments in a moment)
