add LLVM 18.x as a git submodule

This changeset is based on #346

Author: kvpanch

.github/workflows/generate_versions.yml

@@ -16,12 +16,14 @@ jobs:
         uses: actions/checkout@v4
         with:
           path: tmp
+          submodules: true
 
       - name: Checkout
         uses: actions/checkout@v4
         with:
           repository: paritytech/resolc-bin
           path: resolc-bin
+          submodules: true
 
       - uses: actions/create-github-app-token@v1
         id: app-token

.github/workflows/release-llvm.yml

@@ -71,6 +71,8 @@ jobs:
       contents: write # for uploading assets to release
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: true
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           # without this it will override our rust flags
@@ -96,10 +98,6 @@ jobs:
         run: |
           cargo install --locked --force --path crates/llvm-builder
 
-      - name: Clone LLVM
-        run: |
-          revive-llvm --target-env ${{ matrix.builder-arg }} clone
-
       - name: Build LLVM
         if: ${{ matrix.target != 'wasm32-unknown-emscripten' }}
         run: |

.github/workflows/release.yml

@@ -27,6 +27,8 @@ jobs:
       RELEASE_NOTES: ${{ steps.versions.outputs.RELEASE_NOTES }}
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: Check versions
         id: versions
@@ -130,6 +132,8 @@ jobs:
     environment: tags
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: Download Artifacts
         uses: actions/download-artifact@v4

.github/workflows/test-llvm-builder.yml

@@ -4,7 +4,6 @@ on:
     branches: ["main"]
     types: [opened, synchronize]
     paths:
-      - 'LLVM.lock'
       - 'crates/llvm-builder/**'
       - '.github/workflows/test-llvm-builder.yml'
     paths-ignore:
@@ -25,6 +24,8 @@ jobs:
     runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: true
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           # without this it will override our rust flags

.github/workflows/test-wasm.yml

@@ -26,6 +26,8 @@ jobs:
         shell: bash
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: true
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           target: wasm32-unknown-emscripten
@@ -72,6 +74,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: Create Target Directory
         run: mkdir -p ${{ env.REVIVE_WASM_INSTALL_DIR }}

.github/workflows/test.yml

@@ -22,6 +22,8 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: true
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           # without this it will override our rust flags

.gitignore

@@ -8,7 +8,9 @@ target-llvm
 /*.yul
 /*.ll
 /*.s
-/llvm*
+/llvm-*
+# Allow llvm submodule directory
+!/llvm
 node_modules
 artifacts
 tmp

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "llvm"]
+	path = llvm
+	url = https://github.com/llvm/llvm-project.git
+	branch = release/18.x