3 Stage comilation of llvm (on VUC)

compile-llvm.md

Build LLVM

LLVM Build Bot compiling

Stage 1

Git clone llvm-project

git clone https://github.com/llvm/llvm-project.git

cd llvm-project

git config --local advice.detachedHead false

git fetch --depth 100 origin main

Building directory llvm_build0 (not inside llvm-project)

mkdir llvm_build0 && cd llvm_build0

cmake -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF /build/pchaudha/llvm-project/llvm -DLLVM_ENABLE_PROJECTS='clang;compiler-rt;lld' -DBUILD_SHARED_LIBS=On 

ninja

Stage 2

(Only asan build instructions are put here)

1. build libcxx_build_asan directory

mkdir libcxx_build_asan && cd libcxx_build_asan

export ASAN_SYMBOLIZER_PATH="/build/pchaudha/llvm_build0/bin/llvm-symbolizer" 

export ASAN_OPTIONS="check_initialization_order=true:detect_stack_use_after_return=1:detect_leaks=1"

llvm_use_sanitizer="Address"

fsanitize_flag="-fsanitize=address"

cmake_libcxx_cflags="-mllvm -asan-use-private-alias=1"

sanitizer_cflags+=" $sanitizer_ldflags -w"

cmake -GNinja -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF -DCMAKE_C_COMPILER=/build/pchaudha/llvm_build0/bin/clang -DCMAKE_CXX_COMPILER=/build/pchaudha/llvm_build0/bin/clang++ -DLLVM_USE_LINKER=lld -DLLVM_ENABLE_PROJECTS='libcxx;libcxxabi' -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_SANITIZER=${llvm_use_sanitizer} -DCMAKE_C_FLAGS="${fsanitize_flag} ${cmake_libcxx_cflags}" -DCMAKE_CXX_FLAGS="${fsanitize_flag} ${cmake_libcxx_cflags}" -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DBUILD_SHARED_LIBS=On /build/pchaudha/llvm-project/llvm

ninja cxx cxxabi

2. Build llvm_build_asan directory

cd llvm_build_asan && llvm_build_asan

export  ROOT=/build/pchaudha

export libcxx_build_dir=libcxx_build_asan

libcxx_runtime_path=$(dirname $(find ${ROOT}/${libcxx_build_dir} -name libc++.so))

sanitizer_ldflags="-lc++abi -Wl,--rpath=${libcxx_runtime_path} -L${libcxx_runtime_path}"

sanitizer_cflags="-nostdinc++ -isystem ${ROOT}/${libcxx_build_dir}/include -isystem ${ROOT}/${libcxx_build_dir}/include/c++/v1 $fsanitize_flag"

cmake -GNinja -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF -DCMAKE_C_COMPILER=/build/pchaudha/llvm_build0/bin/clang -DCMAKE_CXX_COMPILER=/build/pchaudha/llvm_build0/bin/clang++ -DLLVM_USE_LINKER=lld -DLLVM_ENABLE_PROJECTS='clang;lld;clang-tools-extra;mlir' -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_SANITIZER=${llvm_use_sanitizer} -DLLVM_ENABLE_LIBCXX=ON -DCMAKE_C_FLAGS="${sanitizer_cflags}" -DCMAKE_CXX_FLAGS="${sanitizer_cflags}" -DCMAKE_EXE_LINKER_FLAGS="${sanitizer_ldflags}" -DBUILD_SHARED_LIBS=On /build/pchaudha/llvm-project/llvm

ninja

Ref