WIP: LLVM release workflows

.github/workflows/release-llvm.yml

@@ -0,0 +1,101 @@
+name: Release LLVM
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "version to use in tag name; without the leading 'v', or prefix"
+        required: false
+  push:
+    branches: ["yuri/release-llvm"]
+
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build-macos-gnu:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install macos deps
+        run: |
+          brew install ninja
+
+      - name: versions
+        run: |
+          rustup show
+          cargo --version
+          rustup +nightly show
+          cargo +nightly --version
+          cmake --version
+          echo "bash:" && bash --version
+          echo "ninja:" && ninja --version
+          echo "clang:" && clang --version
+
+      - name: Build LLVM
+        run: |
+          make install-llvm
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: llvm-macos
+          path: target-llvm/gnu/target-final
+          if-no-files-found: error
+          compression-level: 9
+
+  build-windows-gnu:
+#    runs-on: windows-latest
+    runs-on: lorwyn
+    env:
+      MSYSTEM: "MINGW"
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install win deps
+        run: |
+          choco install ninja
+
+      - name: Setup msys2
+        uses: msys2/setup-msys2@v2
+        with:
+          path-type: inherit
+          install: >-
+            base-devel
+            mingw-w64-x86_64-clang
+            mingw-w64-x86_64-lld
+            mingw-w64-x86_64-rust
+            mingw-w64-x86_64-cmake
+            mingw-w64-x86_64-gcc
+            mingw-w64-x86_64-gcc-libs
+            mingw-w64-x86_64-python
+
+      - name: Prepare env
+        shell: "msys2 {0}"
+        run: |
+          echo "/c/Users/runneradmin/.cargo/bin" >> "${GITHUB_PATH}"
+
+      - name: versions
+        run: |
+          rustup show
+          cargo --version
+          rustup +nightly show
+          cargo +nightly --version
+          cmake --version
+
+      - name: Build LLVM
+        shell: 'msys2 {0}'
+        env:
+          VERBOSE: 1
+          LIBSTDCPP_SOURCE_PATH: "C:/a/_temp/msys64/mingw64/lib/libstdc++.a"
+        run: |
+          make install-llvm-builder
+          revive-llvm clone
+          revive-llvm build --llvm-projects lld --llvm-projects clang --extra-args='-DLLVM_HOST_TRIPLE=x86_64-pc-windows-msvc'  
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: llvm-windows
+          path: target-llvm/gnu/target-final
+          if-no-files-found: error
+          compression-level: 9