From e7f2fe64a2c02e7db4168c6cb1754a42bbb5efc8 Mon Sep 17 00:00:00 2001
From: Nicholas Paun <npaun@cloudflare.com>
Date: Mon, 16 Dec 2024 07:51:23 -0800
Subject: [PATCH] Initial import of clang-format build (#2)

---
 .github/workflows/llvm.yml       | 124 +++++++++++++++++++++++++++++++
 build/llvm/common.args           |   6 ++
 build/llvm/default.cmake         |   1 +
 build/llvm/zig-linux-arm64.cmake |  14 ++++
 build/zig-toolchain/ar           |   1 +
 build/zig-toolchain/c++          |   1 +
 build/zig-toolchain/cc           |   1 +
 build/zig-toolchain/ranlib       |   1 +
 build/zig-toolchain/zig-tool.sh  |   3 +
 9 files changed, 152 insertions(+)
 create mode 100644 .github/workflows/llvm.yml
 create mode 100644 build/llvm/common.args
 create mode 100644 build/llvm/default.cmake
 create mode 100644 build/llvm/zig-linux-arm64.cmake
 create mode 120000 build/zig-toolchain/ar
 create mode 120000 build/zig-toolchain/c++
 create mode 120000 build/zig-toolchain/cc
 create mode 120000 build/zig-toolchain/ranlib
 create mode 100755 build/zig-toolchain/zig-tool.sh

diff --git a/.github/workflows/llvm.yml b/.github/workflows/llvm.yml
new file mode 100644
index 0000000..39b04db
--- /dev/null
+++ b/.github/workflows/llvm.yml
@@ -0,0 +1,124 @@
+name: Build LLVM
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'LLVM version to build'
+        default: '18.1.8'
+
+permissions:
+  contents: write
+
+env:
+  LLVM_VERSION: ${{ inputs.version }} 
+  LLVM_TARGETS: 'clang-format'
+  LLVM_BINS: 'clang-format'
+  LLVM_LIBS: ''
+  ZIG_VERSION: '0.14.0-dev.1651+ffd071f55'
+jobs:
+  create-release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Create Github release
+        run: |
+          gh release create -R ${{ github.repository }} llvm-$LLVM_VERSION || true
+        env:
+          GITHUB_TOKEN: ${{ github.TOKEN }}
+  build:
+    needs: create-release
+    strategy:
+      matrix:
+        platform:
+          - os: darwin-arm64
+            runner: macos-latest
+            toolchain: default
+            BIN_SUFFIX: ''
+            SO_SUFFIX: '${{ inputs.version }}.dylib'
+            STATIC_LIB_SUFFIX: 'a'
+            LLVM_TARGETS_TO_BUILD: 'ARM'
+          - os: linux-amd64
+            runner: ubuntu-latest
+            toolchain: default
+            BIN_SUFFIX: ''
+            SO_SUFFIX: 'so.${{ inputs.version }}'
+            STATIC_LIB_SUFFIX: 'a'
+            LLVM_TARGETS_TO_BUILD: 'X86'
+          - os: linux-arm64
+            runner: ubuntu-latest
+            toolchain: zig-linux-arm64
+            BIN_SUFFIX: ''
+            SO_SUFFIX: 'so.${{ inputs.version }}'
+            STATIC_LIB_SUFFIX: 'a'
+            LLVM_TARGETS_TO_BUILD: 'ARM'
+          - os: windows-amd64
+            runner: windows-latest
+            toolchain: default
+            TAR_ARGS: '--exclude=*/clang/test/Driver/Inputs/* --exclude=*/libcxx/test/std/input.output/filesystems/Inputs/static_test_env/* --exclude=*/libclc/amdgcn-mesa3d'
+            BIN_SUFFIX: '.exe'
+            SO_SUFFIX: 'dll'
+            STATIC_LIB_SUFFIX: 'lib'
+            LLVM_TARGETS_TO_BUILD: 'X86'
+    runs-on: ${{ matrix.platform.runner }}
+    name: ${{ matrix.platform.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup for macOS
+        if: runner.os == 'macOS'
+        run: |
+          brew install cmake ninja
+      - name: Setup for Linux
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get install -y cmake ninja-build
+      - name: Setup for Windows
+        if: runner.os == 'Windows'
+        run: |
+          choco install cmake ninja curl
+      - name: Get zig toolchain
+        if: startsWith(matrix.platform.toolchain, 'zig')
+        run: |
+            curl -L https://ziglang.org/builds/zig-linux-x86_64-$ZIG_VERSION.tar.xz -o zig.tar.xz
+            mkdir zig
+            tar -C zig --strip-components=1 -xJf zig.tar.xz
+            cd zig
+            pwd >> $GITHUB_PATH
+      - name: Get llvm
+        shell: bash
+        run: |
+          curl -L https://github.com/llvm/llvm-project/releases/download/llvmorg-$LLVM_VERSION/llvm-project-$LLVM_VERSION.src.tar.xz -o llvm.tar.xz
+          mkdir llvm
+          tar -C llvm --strip-components=1 ${{ matrix.platform.TAR_ARGS }} -xJf llvm.tar.xz
+      - name: Generate build files
+        shell: bash
+        run: |
+          cd llvm
+          cmake -B build llvm -GNinja \
+            -DCMAKE_TOOLCHAIN_FILE=$GITHUB_WORKSPACE/build/llvm/${{ matrix.platform.toolchain }}.cmake \ 
+            $(cat $GITHUB_WORKSPACE/build/llvm/common.args) \
+            -DLLVM_TARGETS_TO_BUILD=${{ matrix.platform.LLVM_TARGETS_TO_BUILD }}
+      - name: Build targets
+        shell: bash
+        run: |
+          cd llvm/build
+          ninja $LLVM_TARGETS
+      - name: Upload products
+        shell: bash
+        run: |
+          cd llvm/build/bin
+          for BIN in $LLVM_BINS; do
+            FILENAME=llvm-$LLVM_VERSION-${{ matrix.platform.os }}-$BIN${{ matrix.platform.BIN_SUFFIX }}
+            mv $BIN${{ matrix.platform.BIN_SUFFIX }} $FILENAME 
+            gh release upload -R ${{ github.repository }} llvm-$LLVM_VERSION $FILENAME || true
+          done
+
+          cd ../lib
+          for LIB in $LLVM_LIBS; do
+            FILENAME=llvm-$LLVM_VERSION-${{ matrix.platform.os }}-$LIB.${{ matrix.platform.SO_SUFFIX }}
+            mv $LIB.${{ matrix.platform.SO_SUFFIX }} $FILENAME
+            gh release upload -R ${{ github.repository }} llvm-$LLVM_VERSION $FILENAME || true
+          done
+        env:
+          GITHUB_TOKEN: ${{ github.TOKEN }}
+
+      
diff --git a/build/llvm/common.args b/build/llvm/common.args
new file mode 100644
index 0000000..02056ec
--- /dev/null
+++ b/build/llvm/common.args
@@ -0,0 +1,6 @@
+-DCMAKE_BUILD_TYPE=Release
+-DLLVM_ENABLE_PROJECTS=clang
+-DBUILD_SHARED_LIBS=OFF
+-DLLDB_ENABLE_PYTHON=0
+-DLLDB_INCLUDE_TESTS=0
+
diff --git a/build/llvm/default.cmake b/build/llvm/default.cmake
new file mode 100644
index 0000000..cea81b6
--- /dev/null
+++ b/build/llvm/default.cmake
@@ -0,0 +1 @@
+# An empty CMake toolchain file to use when we're not cross-compiling
diff --git a/build/llvm/zig-linux-arm64.cmake b/build/llvm/zig-linux-arm64.cmake
new file mode 100644
index 0000000..422db5b
--- /dev/null
+++ b/build/llvm/zig-linux-arm64.cmake
@@ -0,0 +1,14 @@
+# Tell CMake to cross compile
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SYSTEM_PROCESSOR aarch64)
+
+# Set up Zig toolchain
+set(CMAKE_C_COMPILER "${CMAKE_CURRENT_LIST_DIR}/../zig-toolchain/cc" -target aarch64-linux-gnu)
+set(CMAKE_CXX_COMPILER "${CMAKE_CURRENT_LIST_DIR}/../zig-toolchain/c++" -target aarch64-linux-gnu)
+set(CMAKE_AR "${CMAKE_CURRENT_LIST_DIR}/../zig-toolchain/ar")
+set(CMAKE_RANLIB "${CMAKE_CURRENT_LIST_DIR}/../zig-toolchain/ranlib")
+
+# Tell llvm it is being built for another platform
+set(LLVM_DEFAULT_TARGET_TRIPLE aarch64-linux-gnu CACHE INTERNAL "" FORCE)
+
diff --git a/build/zig-toolchain/ar b/build/zig-toolchain/ar
new file mode 120000
index 0000000..82cf569
--- /dev/null
+++ b/build/zig-toolchain/ar
@@ -0,0 +1 @@
+zig-tool.sh
\ No newline at end of file
diff --git a/build/zig-toolchain/c++ b/build/zig-toolchain/c++
new file mode 120000
index 0000000..82cf569
--- /dev/null
+++ b/build/zig-toolchain/c++
@@ -0,0 +1 @@
+zig-tool.sh
\ No newline at end of file
diff --git a/build/zig-toolchain/cc b/build/zig-toolchain/cc
new file mode 120000
index 0000000..82cf569
--- /dev/null
+++ b/build/zig-toolchain/cc
@@ -0,0 +1 @@
+zig-tool.sh
\ No newline at end of file
diff --git a/build/zig-toolchain/ranlib b/build/zig-toolchain/ranlib
new file mode 120000
index 0000000..82cf569
--- /dev/null
+++ b/build/zig-toolchain/ranlib
@@ -0,0 +1 @@
+zig-tool.sh
\ No newline at end of file
diff --git a/build/zig-toolchain/zig-tool.sh b/build/zig-toolchain/zig-tool.sh
new file mode 100755
index 0000000..caedca2
--- /dev/null
+++ b/build/zig-toolchain/zig-tool.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+zig $(basename $0) "$@"