https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83531
--- Comment #8 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to Erik Schnetter from comment #7) > I don't think that people didn't notice. I rather think that they gave up > building the sanitizer. See also > https://github.com/spack/spack/tree/develop/var/spack/repos/builtin/packages/ > gcc and > https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/ > gcc/darwin/headers-10.13-fix.patch , which includes this fix automatically > when GCC is built via Spack. see comment #3 For the record, I build the sanitisers on all systems > Darwin10/macOS 10.6 (where it's no longer supported upstream and is now pretty broken). However, I don't build all the older systems that often - but (for example) - see https://gcc.gnu.org/ml/gcc-testresults/2019-02/msg00055.html So .. I agree that we have test issues with headers [ comment #4 ] (and those need resolving in a general way, not piecemeal) - but AFAICT bootstrap is not broken on current 10.13. [maybe someone is using a different version of the SDK from me? if so, please be specific about the version of Xcode and the SDK in use, thanks.]