https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90834
--- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> --- I don't have 10.15 or xcode 11 yet .. does ... configure --prefix ... --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" work? (without the symlink hacks) === The version-specific /Library/Developer/CommandLineTools/SDKs/MacOSX.10.XX.sdk is (so far) just a symlink to the generic name (presumably, you can't make the symlink hacks without switching SIP off .. and [IMO] switching SIP off should not be a pre-requisite for building / testing a toolchain FWIW, SIP is on all my systems except a Darwin17 one with VirtualBox which won't function there under SIP... * I don't have Xcode installed on most of my systems, nor the command line tools, so most of my config lines look something like the above [with paths for the SDK to where I've placed it] (if that no longer works, then ...) === (not disagreeing that we need a way to handle this, but neither turning gcc's driver into xcrun ... nor using several extra process launches, per invocation.. seems a useful way)
