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LLD+LLVM packages for Windows

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Abstract

LLVM is huge, and it's getting bigger with each and every release. Building it together with a project that depends on it (e.g., a programming language) during a CI build is not an option -- building just LLVM eats most (earlier LLVM releases), and all (recent LLVM releases) of the allotted CI build time.

So why not use pre-built packages from the official LLVM download page Unfortunately, the official binaries cover just a tiny fraction of possible build configurations on Microsoft Windows. There are no Debug libraries, no builds for the static LIBCMT, and only a single toolchain per LLVM release.

The llvm-package-windows project builds all major versions of LLVM on GitHub Actions for the following, much more complete matrix:

  • Toolchain:

    • Visual Studio 2019

  • Configuration:

    • Release

  • Target CPU:

    • AMD64 (a.k.a. x86_64)

  • C/C++ Runtime:

    • MSVCRT (dynamic)

The resulting LLVM binary packages are uploaded as GitHub Release artifacts. Compiler developers can now thoroughly test their LLVM-dependent projects on GitHub CI or AppVeyor CI simply by downloading and unpacking an archive with the required LLVM prebuilt binaries during the CI installation stage.