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The best, most up-to-date and comprehensive open-source toolchains on the market!
They target musl libc, the better C standard library, and include Linux kernel headers.

From OS X / macOS, cross-compile your C, C++, and Fortran applications
for Linux on ARM, Motorola 68000, MIPS, OpenRISC, PowerPC, RISC-V, S/390,
SuperH, x86-based, and (very soon) SPARC.

While these toolchains work well out of the box, they're intended to supplement
a Homebrew development environment (which includes common build tools).
Use Docker? We've got you covered.

Installation is easy: extract a toolchain and update your $PATH environment variable.

Ingredients:

• musl: git-0a005f4 (2020-07-05)
• GCC: 9.3.0
• binutils: 2.34
• GMP: 6.2.0
• MPFR: 4.0.2
• MPC: 1.1.0
• Linux: 5.4.50
• MinGW-w64: git-82a466 (2020-07-04)

Toolchains:

Toolchains support the following languages: C, C++, Fortran except where noted^a.
They are cryptographically signed with the following key: 0xB1D0B4566FBBDB40

For Linux-Linux, Linux-Windows, and Windows-Windows toolchains: homepage.
Archived versions are here (cue laughter). Something else? Contact me.

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TEMPORARILY_UNAVAILABLE                            06-Mar-2021 22:06                   0

Notes:

• Currently built on a very old Mac Pro until I can work out how to cross-compile from Linux to Darwin.
• All toolchains on this website were built using this script (thanks Richard L. Campbell for your help with the Homebrew issue).
• Gatekeeper (Catalina forward) is annoying. Workaround from toolchain root directory: find . -perm +111 -type f | while read k; do cat $k > .tmp && chmod +x .tmp && mv .tmp $k; done
• On Mojave, macsimum may require sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /