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Contributing to Null-Safe Clang

Development branch: nullsafe-clang-dev

Building

Standard (x86)

Clang only:

mkdir build && cd build
cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang" ../llvm
ninja clang

Clang + clangd (language server):

mkdir build && cd build
cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" ../llvm
ninja clang clangd

WASM (playground)

# Clone and setup Emscripten (first time only)
git clone https://github.com/emscripten-core/emsdk.git
cd emsdk
./emsdk install latest
./emsdk activate latest
source ./emsdk_env.sh
cd ..

# Build WASM
mkdir build-wasm && cd build-wasm
export PATH="/path/to/emsdk/upstream/emscripten:$PATH"
emcmake cmake -G Ninja -DCMAKE_BUILD_TYPE=Release \
  -DLLVM_ENABLE_PROJECTS="clang" -DLLVM_TARGETS_TO_BUILD="WebAssembly" \
  -DLLVM_ENABLE_THREADS=OFF \
  -DCMAKE_EXE_LINKER_FLAGS="-sEXPORTED_RUNTIME_METHODS=callMain -sEXIT_RUNTIME=0 -sALLOW_MEMORY_GROWTH=1" \
  ../llvm
ninja clang

# Output: bin/clang.wasm and bin/clang.js

Testing

cd build
ninja FileCheck count not split-file llvm-config
./bin/llvm-lit -v ../clang/test/Sema/strict-nullability.c

Releases

Playground: Push to nullsafe-clang-dev → deploys GitHub Pages automatically.

WASM files: git tag playground-v1.0 && git push origin playground-v1.0

Binaries: git tag v1.0.0 && git push origin v1.0.0

Downloads: https://github.com/cs01/llvm-project/releases