One-click static-friendly musl-based GCC macOS-to-Linux cross-compilers based on FiloSottile/homebrew-musl-cross and richfelker/musl-cross-make.
brew install richard-vd/musl-cross/musl-cross
By default it will build a full cross compiler toolchain targeting musl Linux amd64.
You can then use x86_64-linux-musl- versions of the tools to build for the target.
For example x86_64-linux-musl-cc will compile C code to run on musl Linux amd64.
The "musl" part of the target is important: the binaries will ONLY run on a musl-based system, like Alpine.
However, if you build them as static binaries by passing -static as an LDFLAG they will run anywhere.
Musl is specifically engineered to support static binaries.
Other architectures are supported. For example you can build a Raspberry Pi cross-compiler:
brew install richard-vd/musl-cross/musl-cross --without-x86_64 --with-arm-hf
You can also use --with-i486 (x86 32-bit), --with-aarch64 (ARM 64-bit), --with-arm (ARM soft-float), --with-mips and --with-powerpc.
(Note: a custom build can take up to several hours and gigabytes of disk space, depending on the selected architectures and on the host CPU. The default installed size is between 200MB and 300MB.)
If you encounter issues with a missing musl-gcc binary, the build system might be assuming the presence of the musl host compiler wrapper. That should be reported as an issue, but you might be able to workaround it by creating a symlink:
ln -s /usr/local/opt/musl-cross/bin/x86_64-linux-musl-gcc /usr/local/bin/musl-gcc