lucor/osxcross

OSXCross lets you build software for macOS while sitting on a Linux, FreeBSD, OpenBSD, or Android machine. Instead of needing a Mac to compile code that runs on macOS, this toolchain handles the translation for you, similar to how a translator lets you write documents in one language that end up in another. At its core, the toolchain provides three essential pieces: the Clang/LLVM compiler (which already knows how to produce code for different targets), a set of macOS-specific build tools like a linker and file manipulator, and the macOS SDK, basically a library of code that macOS programs depend on. The project includes scripts that automate the tedious work of gathering these pieces, configuring them correctly, and stitching them together into a working compiler setup. Once installed, you can compile C, C++, or other code just as you would on a Mac, but the resulting programs run on macOS instead of your current system. The toolchain supports multiple processor architectures: it can run on Intel or ARM-based Linux machines and produce binaries for Intel (32-bit or 64-bit), ARM64, or even Apple's specialized ARM64e chips. This makes it especially useful for open-source projects that need macOS builds but don't have Mac hardware available, or for continuous integration systems that want to test macOS compatibility without owning multiple machines. Projects like Smartmontools and Docker-based build systems use it to compile for macOS as part of larger cross-platform workflows. Getting started requires extracting Apple's macOS SDK (legally obtained from Xcode) and running the build scripts. The process involves a few dependencies like CMake and development libraries, but the project provides automated setup for most common Linux distributions. Once running, you use familiar compiler commands like o64-clang++ instead of clang++ to specify that you're targeting macOS.