libc on osx not found

[aahmed-se]

05:00 PM|alia-zstd$ export CC="/usr/local/bin/zig cc"
05:00 PM|alia-zstd$ make
/usr/local/bin/zig cc -O3   -I. -I./common -DXXH_NAMESPACE=ZSTD_ -I./legacy -DZSTD_LEGACY_SUPPORT=5  -c -o common/debug.o common/debug.c
Zig attempted to find the path to native system libc headers by executing this command:
/usr/local/bin/zig cc -E -Wp,-v -xc /dev/null
Unable to link against libc: Unable to find libc installation: unable to spawn system C compiler
See `zig libc --help` for more details.
make[1]: *** [common/debug.o] Error 1
make: *** [lib-release] Error 2

[aahmed-se]

zig version
0.6.0

[mikdusan]

reductions

CC="zig cc" zig libc

CC="`which zig` cc" zig libc

Zig attempted to find the path to native system libc headers by executing this command:
/Users/mike/project/zig/work/main/_build/zig cc -E -Wp,-v -xc /dev/null
unable to find native libc file: unable to spawn system C compiler

[andrewrk]

The good news is with 2eee058 the example in the OP works: I just built zstd with zig cc. In fact, I can even cross compile it targeting macOS, but the executable isn't viable until #3295 is solved.

The bad news is that this is a 0.8.0 milestone issue, and won't be fixed for 0.7.1 because it depends on some non-trivial improvements to Zig's ability to provide macOS C header files.

Will try @mikdusan's reduction next.

[andrewrk]

I don't think we can make CC="zig cc" zig libc work. However there is something you can do as a user if you want this to work. It is a viable workaround for 0.7.0. The key is to save the output of zig libc into a file before setting the env var.

zig libc >$FOO/libc.txt
export ZIG_LIBC=$FOO/libc.txt
export CC="zig cc"