LLVMCMakeTemplate

Just a simple example of how to properly link to LLVM with CMake on Windows, Linux and macos.

Requirements

• Visual Studio 2019 or a C++17 compiler that can build LLVM.
• CMake 3.15

NOTE: On Windows you may need to enable long paths to compile LLVM:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem]
"LongPathsEnabled"=dword:00000001

You will then need to reboot your machine for the changes to take effect.

Compiling LLVM

On Windows open a Visual Studio x64 command prompt:

# Checkout LLVM 15
git clone -b release/15.x --single-branch https://github.com/llvm/llvm-project.git --depth 1
cd llvm-project

# Build LLVM
cmake -G Ninja -B build -S llvm -DCMAKE_BUILD_TYPE=Release "-DLLVM_ENABLE_PROJECTS=clang;lld" -DLLVM_PARALLEL_LINK_JOBS=1 -DLLVM_BUILD_EXAMPLES=OFF -DLLVM_BUILD_TESTS=OFF
cmake --build build
cmake --install build --prefix build/install

You can ZIP the install prefix to move it between machines.

Building the project

cmake -G Ninja -B build -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_PREFIX_PATH=llvm-project/build/install
cmake --build build