Create LLVM SDK Build

[hughperkins]

High level goal:

• create LLVM SDK Build

Based on #5 from @johnnynunez

Global changes:

• disable assertions
• remove MLIR
• disable ZSTD
• disable ZLIB
• disable xml2

Linux build changes:

• switch to use manylinux for building on linux, to be compatible with our wheel building
• no longer install python
• dont install gcc

Windows build changes:

• switch to using MSVC
• install MSVC
• switch threading model

[johnnynunez]

nice work!

[duburcqa]

why || true ?

[hughperkins]

Soo...

• on Mac, this doesnt exist /Users/runner/work/_temp/llvm-install/bin/llvm-strip: error: option is not supported for MachO
  • we could presumably add some kind of condiitonal to not run on Mac
• on arm, this gives /__w/_temp/llvm-install/bin/llvm-strip: error: '/__w/_temp/taichi-llvm-15.0.7-linux-aarch64/bin/scan-build': The file was not recognized as a valid object file

[hughperkins]

(It's possible that the strip also fails on ubuntu x86 tbh, since that build didnt finish yet)

[hughperkins]

@johnnynunez thoughts on this llvm-strip error on arm?

[johnnynunez]

@hughperkins can you try:

- name: Package (Linux/macOS)
        if: runner.os != 'Windows'
        env:
          CMAKE_INSTALL_PREFIX: ${{ steps.prefix.outputs.prefix }}
        run: |
          pkgroot="${RUNNER_TEMP}/taichi-llvm-${LLVM_VERSION}-${{ steps.pkgmeta.outputs.suffix }}"
          mkdir -p "$pkgroot"
          # copy install tree
          cp -R "${CMAKE_INSTALL_PREFIX}/." "$pkgroot/"
          # bundle license
          # The llvm-project directory is not available in this step, but the license was installed.
          cp "${CMAKE_INSTALL_PREFIX}/LICENSE.TXT" "$pkgroot/LLVM-LICENSE.txt" || true
          # optional strip to shrink size
          if [ -x "${CMAKE_INSTALL_PREFIX}/bin/llvm-strip" ]; then
            # Strip only ELF binaries and shared objects, not scripts.
            find "$pkgroot/bin" -type f -exec file {} + | grep -E 'ELF.*executable|ELF.*shared object' | cut -d: -f1 | xargs --no-run-if-empty "${CMAKE_INSTALL_PREFIX}/bin/llvm-strip" --strip-unneeded
            find "$pkgroot/lib" -type f \( -name "*.so*" -o -name "*.dylib" -o -name "*.a" \) \
              -exec "${CMAKE_INSTALL_PREFIX}/bin/llvm-strip" --strip-unneeded {} +
          fi
          ( cd "${RUNNER_TEMP}" && zip -r "${GITHUB_WORKSPACE}/${{ steps.pkgmeta.outputs.zip }}" \
              "taichi-llvm-${LLVM_VERSION}-${{ steps.pkgmeta.outputs.suffix }}" )
          # sha256
          ( cd "${GITHUB_WORKSPACE}" && shasum -a 256 "${{ steps.pkgmeta.outputs.zip }}" > "${{ steps.pkgmeta.outputs.zip }}.sha256" || sha256sum "${{ steps.pkgmeta.outputs.zip }}" > "${{ steps.pkgmeta.outputs.zip }}.sha256" )

[hughperkins]

@johnnynunez Where is RUNNER_OS defined?

[hughperkins]

Oh I see, it's a standard github var:

[johnnynunez]

@hughperkins good job!