build.ps1

$LLVM_VERSION = $args[0]
$LLVM_REPO_URL = $args[1]

if ([string]::IsNullOrEmpty($LLVM_REPO_URL)) {
    $LLVM_REPO_URL = "https://github.com/llvm/llvm-project.git"
}

if ([string]::IsNullOrEmpty($LLVM_VERSION)) {
    Write-Output "Usage: $PSCommandPath <llvm-version> <llvm-repository-url>"
    Write-Output ""
    Write-Output "# Arguments"
    Write-Output "  llvm-version         The name of a LLVM release branch without the 'release/' prefix"
    Write-Output "  llvm-repository-url  The URL used to clone LLVM sources (default: https://github.com/llvm/llvm-project.git)"

	exit 1
}

# Clone the LLVM project.
if (-not (Test-Path -Path "llvm-project" -PathType Container)) {
	git clone -b "release/$LLVM_VERSION" --single-branch --depth=1 "$LLVM_REPO_URL" llvm-project
}

Set-Location llvm-project
git fetch origin
git checkout "release/$LLVM_VERSION"
git reset --hard origin/"release/$LLVM_VERSION"

# Create a directory to build the project.
New-Item -Path "build" -Force -ItemType "directory"
Set-Location build

# Create a directory to receive the complete installation.
New-Item -Path "install" -Force -ItemType "directory"

# Adjust compilation based on the OS.
$CMAKE_ARGUMENTS = ""

# Adjust cross compilation
$CROSS_COMPILE = ""

# Run `cmake` to configure the project, using MSVC.
$CMAKE_CXX_COMPILER="cl.exe"
$CMAKE_C_COMPILER="cl.exe"
$CMAKE_LINKER_TYPE="MSVC"

cmake `
  -G "Ninja" `
  -DCMAKE_BUILD_TYPE=MinSizeRel `
  -DCMAKE_INSTALL_PREFIX=destdir `
  -DLLVM_ENABLE_PROJECTS="clang;lld" `
  -DLLVM_ENABLE_TERMINFO=OFF `
  -DLLVM_ENABLE_ZLIB=OFF `
  -DLLVM_ENABLE_LIBXML2=OFF `
  -DLLVM_INCLUDE_DOCS=OFF `
  -DLLVM_INCLUDE_EXAMPLES=OFF `
  -DLLVM_INCLUDE_GO_TESTS=OFF `
  -DLLVM_INCLUDE_TESTS=OFF `
  -DLLVM_INCLUDE_TOOLS=ON `
  -DLLVM_INCLUDE_UTILS=OFF `
  -DLLVM_OPTIMIZED_TABLEGEN=ON `
  -DLLVM_TARGETS_TO_BUILD="X86;AArch64;RISCV;WebAssembly;LoongArch" `
  $CROSS_COMPILE `
  $CMAKE_ARGUMENTS `
  ../llvm

# Showtime!
cmake --build . --config Release

# Not using DESTDIR here, quote from
# https://cmake.org/cmake/help/latest/envvar/DESTDIR.html
# > `DESTDIR` may not be used on Windows because installation prefix
# > usually contains a drive letter like in `C:/Program Files` which cannot
# > be prepended with some other prefix.
cmake --install . --strip --config Release