https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90558

--- Comment #5 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Rich Townsend from comment #0)
> I'm running into a bug building on OSX Mojave, which seems to be tied into
> the problems with _Atomic in Apple's system headers. The error itself is:

> /Users/townsend/devel/sdk2/build/gcc/configure CC=
> --build=x86_64-apple-darwin18.5.0 --prefix=/Applications/mesasdk-dev
> --with-gmp=/Applications/mesasdk-dev --with-mpfr=/Applications/mesasdk-dev
> --with-mpc=/Applications/mesasdk-dev --enable-languages=c,c++,fortran
> --disable-multilib --disable-nls --disable-libsanitizer --with-sysroot=/
> --with-build-sysroot=/Users/townsend/devel/sdk2/build/xcode
> 
> The messing around with --with-sysroot and --with-build-sysroot is so that
> the resulting compiler can be used on older OSX versions, without any
> undefined symbols cropping up. My understanding of these flags is that:

This part is a duplicate of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79885

there's an experimental patch at comment #10

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