Getting Started

Develop

To build FORMOSA LLVM, you have to ensure you have successfully install nix package manger on your machine and follow these steps:

Enter the development shell
```
nix develop
```

configure

cmake -G Ninja -S llvm -B build \
    -DLLVM_ENABLE_PROJECTS="clang;lld;libclc" \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_C_COMPILER="gcc" \
    -DCMAKE_CXX_COMPILER="g++" \
    -DLLVM_DEFAULT_TARGET_TRIPLE=riscv64-unknown-elf \
    -DLLVM_TARGETS_TO_BUILD="RISCV;X86" \
    -DLLVM_USE_LINKER=lld \
    -DLIBCLC_TARGETS_TO_BUILD="riscv64-unknown-elf" \
    -DLLVM_BUILD_LLVM_DYLIB=ON

Note: If you don't have lld, you could install with:

sudo apt install lld

Using lld is strongly suggested to save your time and memory.

build
```
cmake --build build
```
Note: If your memory is not enough for parallel linking, consider adding -DLLVM_PARALLEL_LINK_JOBS=2 to restrict the jobs for linking.