Building LLVM from source on Windows (MSVC)

LLVMWindowsBuild.md

Building LLVM from source on Windows (MSVC)

Prerequisites

• Git
• Visual Studio with C++ development toolchain installed

Steps

All these steps (maybe apart from 1.) must be run in Developer Command Prompt for VS

1. Clone LLVM repo

# Specify the release using --branch
git clone --config core.autocrlf=false --depth 1 --branch llvmorg-16.0.6 https://github.com/llvm/llvm-project.git
cd llvm-project

2. Configure the build with CMake

# You can add `-DLLVM_ENABLE_PROJECTS="..."` to also compile other tools, e.g. clang, lld.
# Remember to change `-DCMAKE_INSTALL_PREFIX` to a real path
cmake -S llvm -B build -G Ninja -DCMAKE_BUILD_TYPE=MinSizeRel -DLLVM_HOST_TRIPLE="x86_64-pc-windows-msvc" -DCMAKE_INSTALL_PREFIX="C:\some\path\for\llvm\binaries" -DLLVM_ENABLE_ASSERTIONS=ON

3. Build and test LLVM

# Use check-'tool' for other tools like clang
ninja -C build check-llvm

4. Install

ninja -C build install

5. Add the path from CMAKE_INSTALL_PREFIX to the PATH