Trimming LLVM builds

[dslm4515]

Building LLVM with the least amount of cmake options yields a long build with lots of features and tools not used to build a system.

The tool chain built in MLFS is a lot smaller than the one for CMLFS:

MLFS tool chain 79MB
CMLFS tool chain 186MB

Perhaps, more cmake options should be defined to turn off unused tests and tools

[dslm4515]

cgnutools

LLVM should be built to just have the following and nothing else. It should NOT have any extra tools, tests, benchmarks, or extra features.

• clang
• compiler-rt
• LLD
• libunwind
• libcxxabi
• libcxx
• binary tools like llvm-as

CMake options

export BUILD_OFF="-DLLVM_BUILD_TESTS=OFF \
                  -DLLVM_INCLUDE_GO_TESTS=OFF \
                  -DLLVM_INCLUDE_TESTS=OFF \
                  -DCOMPILER_RT_CAN_EXECUTE_TESTS=OFF \
                  -DLLVM_INCLUDE_DOCS=OFF \
                  -DLLVM_ENABLE_OCAMLDOC=OFF \
                  -DLLVM_INCLUDE_EXAMPLES=OFF \
                  -DLLVM_INCLUDE_BENCHMARKS=OFF \
                  -DCOMPILER_RT_BUILD_SANITIZERS=OFF \
                  -DCOMPILER_RT_BUILD_XRAY=OFF \
                  -DCOMPILER_RT_BUILD_PROFILE=OFF \
                  -DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
                  -DCLANG_ENABLE_STATIC_ANALYZER=OFF \
                  -DCLANG_ENABLE_ARCMT=OFF \
                  -DCOMPILER_RT_HWASAN_WITH_INTERCEPTORS=OFF \
                  -DLIBCXX_ENABLE_DEBUG_MODE_SUPPORT=OFF \
                  -DLLVM_ENABLE_BACKTRACES=OFF \
                  -DLLVM_ENABLE_LIBPFM=OFF \
                  -DLIBCXX_INCLUDE_BENCHMARKS=OFF \
                  -DLLVM_ENABLE_CRASH_OVERRIDES=OFF \
                  -DLLVM_ENABLE_LIBEDIT=OFF \
                  -DLLVM_ENABLE_LIBXML2=OFF "

Binaries to remove:

[dslm4515]

llvmtools

LLVM should have only the following, and nothing else. It should not have any extra tools, tests, benchmarks, or extra features.

• clang
• compiler-rt
• LLD
• binary tools like llvm-as or llvm-ar

CMake options