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upgrade-llvm.md

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Upgrading LLVM

To upgrade the underlying LLVM version you need to:

  • Update the submodule in this project (see below)
  • Update the version in docker/sysroot.dockerfile
  • Update the version in faasmtools
  • Update Makefile
  • Grep the project for any other mentions of the LLVM version
  • Run the inv container.toolchain task
  • Test it out
  • Run the inv container.push-toolchain task

Updating the LLVM submodule

Find the commit related to tag name for the desired release in the LLVM repo (e.g. llvmorg-10.0.1), then:

cd third-party/llvm-project
git checkout main
git fetch origin
git checkout <tag-name>

Rebuilding LLVM

To rebuild LLVM, there a couple of options. To rebuild just libc:

make clean-libc
make

To rebuilding all the libs, i.e. libc, libcxx, libcxxabi and compiler-rt:

make clean-libs
make

The final option is to rebuild everything, including Clang. This only necessary if you need to change the underlying LLVM or Clang configuration:

make clean-all
make

Troubleshooting the build

If a given project fails you need to go to the build dir (e.g. for libcxx this would be third-party/llvm-project/build/libcxx) then look at CMakeFiles/CMakeError.log and CMakeFiles/CMakeOutput.log.

One thing to check for is the magic libclang_rt.builtins-wasm32.tar.gz file. This should get built by the build process but if you need to fiddle with it you can download it as part of the WASI SDK Release.