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Speed up LLVM SDK builds, especially Windows #14

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Merged
hughperkins merged 6 commits into from
Mar 12, 2026
Merged

Speed up LLVM SDK builds, especially Windows #14

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3250863
Speed up LLVM SDK builds, especially Windows
hughperkins Mar 1, 2026
01ce324
Update default LLVM version to 22.1.0
hughperkins Mar 1, 2026
ab3e452
Fix Windows SDK build to use MSVC instead of MinGW GCC
hughperkins Mar 1, 2026
52c003f
Use vcvarsall x64 and strip MinGW from PATH for Windows build
hughperkins Mar 1, 2026
cad413c
Use vswhere to dynamically find VS install path for Windows build
hughperkins Mar 1, 2026
75d1c7a
Set macOS deployment target to 11.0 for SDK compatibility
hughperkins Mar 2, 2026
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53 changes: 43 additions & 10 deletions .github/workflows/llvm-ci.yml
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
name: Build LLVM (matrix)

env:
DEFAULT_LLVM_VERSION: '15.0.7'
DEFAULT_LLVM_VERSION: '22.1.0'

on:
workflow_dispatch:
Expand Down Expand Up @@ -84,16 +84,29 @@ jobs:
git fetch --depth 1 origin "${LLVM_TAG}"
git checkout --detach FETCH_HEAD

extra_cmake_args=""
if [ "$(uname)" = "Darwin" ]; then
extra_cmake_args="-DCMAKE_OSX_DEPLOYMENT_TARGET=11.0"
fi

cmake -S llvm -B build -G Ninja \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX="${CMAKE_INSTALL_PREFIX}" \
-DLLVM_ENABLE_PROJECTS="clang;lld" \
-DLLVM_ENABLE_PROJECTS="clang" \
-DLLVM_ENABLE_RTTI:BOOL=ON \
-DLLVM_ENABLE_LIBXML2=OFF \
-DLLVM_ENABLE_ZLIB=OFF \
-DLLVM_ENABLE_ZSTD=OFF \
-DLLVM_TARGETS_TO_BUILD="host;NVPTX;AMDGPU" \
-DLLVM_ENABLE_TERMINFO=OFF
-DLLVM_ENABLE_TERMINFO=OFF \
-DLLVM_INCLUDE_TESTS=OFF \
-DLLVM_INCLUDE_EXAMPLES=OFF \
-DLLVM_INCLUDE_BENCHMARKS=OFF \
-DLLVM_INCLUDE_DOCS=OFF \
-DCLANG_INCLUDE_TESTS=OFF \
-DCLANG_ENABLE_STATIC_ANALYZER=OFF \
-DCLANG_ENABLE_ARCMT=OFF \
$extra_cmake_args

cmake --build build --target all -- -k 0
cmake --build build --target install
Expand All @@ -108,34 +121,54 @@ jobs:
$ErrorActionPreference = 'Stop'
Write-Host "Using LLVM_TAG=$env:LLVM_TAG"

$vsPath = "C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\Common7\Tools\VsDevCmd.bat"
cmd /c "`"$vsPath`" && set" | ForEach-Object {
# Find VS installation and set up MSVC x64 environment
$vsWhere = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe"
$vsInstall = & $vsWhere -latest -property installationPath
Write-Host "VS install path: $vsInstall"
$vcvarsall = Join-Path $vsInstall "VC\Auxiliary\Build\vcvarsall.bat"
cmd /c "`"$vcvarsall`" x64 && set" | ForEach-Object {
if ($_ -match '^([^=]+)=(.*)') {
[Environment]::SetEnvironmentVariable($matches[1], $matches[2])
}
}

# Remove MSYS2/MinGW from PATH so CMake Ninja finds MSVC cl.exe
$env:PATH = ($env:PATH -split ';' | Where-Object { $_ -notmatch 'msys|mingw' }) -join ';'

$clPath = where.exe cl 2>&1 | Select-Object -First 1
Write-Host "cl.exe at: $clPath"

New-Item -ItemType Directory -Force -Path llvm-project | Out-Null
Set-Location llvm-project
git init
git remote add origin https://github.com/llvm/llvm-project.git
git fetch --depth 1 origin "$env:LLVM_TAG"
git checkout --detach FETCH_HEAD

cmake -S llvm -B build -G "Visual Studio 17 2022" -A x64 `
cmake -S llvm -B build -G Ninja `
-DCMAKE_C_COMPILER=cl `
-DCMAKE_CXX_COMPILER=cl `
-DCMAKE_BUILD_TYPE=Release `
-DCMAKE_INSTALL_PREFIX="$env:CMAKE_INSTALL_PREFIX" `
-DLLVM_ENABLE_PROJECTS="clang;lld" `
-DLLVM_ENABLE_PROJECTS="clang" `
-DLLVM_ENABLE_RTTI:BOOL=ON `
-DLLVM_ENABLE_LIBXML2=OFF `
-DLLVM_ENABLE_ZLIB=OFF `
-DLLVM_ENABLE_ZSTD=OFF `
-DLLVM_TARGETS_TO_BUILD="host;NVPTX;AMDGPU" `
-DLLVM_ENABLE_TERMINFO=OFF `
-DCMAKE_MSVC_RUNTIME_LIBRARY="MultiThreadedDLL"
-DCMAKE_MSVC_RUNTIME_LIBRARY="MultiThreadedDLL" `
-DLLVM_INCLUDE_TESTS=OFF `
-DLLVM_INCLUDE_EXAMPLES=OFF `
-DLLVM_INCLUDE_BENCHMARKS=OFF `
-DLLVM_INCLUDE_DOCS=OFF `
-DCLANG_INCLUDE_TESTS=OFF `
-DCLANG_ENABLE_STATIC_ANALYZER=OFF `
-DCLANG_ENABLE_ARCMT=OFF `
-DLLVM_PARALLEL_LINK_JOBS=2

cmake --build build --config Release --target ALL_BUILD
cmake --build build --config Release --target INSTALL
cmake --build build --target all -- -k 0
cmake --build build --target install

# ---------- compute package naming ----------
- name: Compute package name
Expand Down