This is the "COROOT" — files in this directory are used by compis at runtime and are bundled with the distribution (in the same directory as the compis executable, sans "lib/".)

Overview:

• clangres contains clang resources like SIMD headers. It is automatically included by compis for C source files and by the cc command.
• co contains headers used by compis C sources.
• darwin contains system library .tbd index files for macOS. These are used by the linker when targeting macos.
• librt contains the "builtins" runtime library, automatically built and included for compis and cc linking.
• musl contains sources and headers for musl, the Linux libc used for linux targets
• sysinc contains system headers. sysinc is not checked into git, but is generated from sysinc-src.
• sysinc-src is compiled to a more compact format as sysinc, which is what is actually included in distributions. During development, build.sh is responsible for building the sysinc as needed. (sysinc is not checked in to git since it is generated.)
• wasi contains sources for libc (and libwasi-*) for the WASI platform.

Note: libc and librt are not used if -nostdlib is provided to cc.

etc/update-clangres.sh 

etc/update-librt.sh 

etc/update-musl.sh 

Note: public musl headers reside at musl/include rather than in sysinc. It's separated like this since it's possible to compile for linux without libc.

You need to run this script on both an x86_64 mac and an arm one since headers are resolved by clang.

Manual first steps:

1. Download all SDKs you'd like to import from https://developer.apple.com/download/all/?q=command%20line Note that you can search for specific OS versions, e.g. https://developer.apple.com/download/all/?q=command%20line%2010.13
2. Mount all downloaded disk images, so that you have e.g. "/Volumes/Command Line Developer Tools"
3. Run this script:

etc/update-macos-libs-and-headers.sh 

Needs to run on a Linux host (any distro, any arch)

etc/update-linux-headers.sh 

etc/update-wasi.sh