https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90330
--- Comment #32 from Iain Sandoe <iains at gcc dot gnu.org> ---
Well it still Works For Me™
If this is still not working for you, I might speculate that something is
corrupted in an install somewhere, perhaps reinstall command line tools /
Xcode?
$ /src-local/gcc-9-branch/configure
--prefix=/opt/iains/x86_64-apple-darwin18/gcc-9-2c
--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk CC='clang
--sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk' CXX='clang++
--sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk' >conf.txt
configure: WARNING: using in-tree isl, disabling version check
*** This configuration is not supported in the following subdirectories:
target-libvtv target-libphobos target-libgo gnattools gotools
target-libada target-libhsail-rt target-zlib target-libffi target-liboffloadmic
(Any other directories should still work fine.)
$ time nice make -j4 >b.txt 2>e.txt && time make install >ins.txt 2>ine.txt &&
time nice make -j3 -k check >cc.txt 2>ec.txt
real 116m21.832s
user 298m14.583s
sys 37m13.525s
real 0m28.414s
user 0m11.306s
sys 0m11.122s
real 209m50.700s
user 359m34.820s
sys 170m38.173s
$ clang --version
Apple LLVM version 10.0.1 (clang-1001.0.46.3)
$ uname -v
Darwin Kernel Version 18.7.0: Thu Jun 20 18:42:21 PDT 2019;
root:xnu-4903.270.47~4/RELEASE_X86_64
$ /opt/iains/x86_64-apple-darwin18/gcc-9-2c/bin/gcc --version
gcc (GCC) 9.2.0
