tce-load -i compiletc cmake libxml2-dev libffi-dev ninja zstd-dev perl5

wget https://github.com/llvm/llvm-project/releases/download/llvmorg-22.1.0/llvm-project-22.1.0.src.tar.xz

cd llvm-project-22.1.0.src

grep -rl '#!.*python' | xargs sed -i '1s/python$/python3/'

sed 's/utility/tool/' -i llvm/utils/FileCheck/CMakeLists.txt

mkdir llvm/build
cd llvm/build

CC=gcc CXX=g++ cmake -LAH -DCMAKE_C_FLAGS_RELEASE="-mtune=generic -Os -pipe" CC="gcc" CXX="g++" -DCMAKE_CXX_FLAGS_RELEASE="-mtune=generic -Os -pipe" -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_SKIP_INSTALL_RPATH=ON -DLLVM_ENABLE_FFI=ON -DCMAKE_BUILD_TYPE=Release -DLLVM_BUILD_LLVM_DYLIB=ON -DLLVM_LINK_LLVM_DYLIB=ON -DLLVM_ENABLE_RTTI=ON -DLLVM_TARGETS_TO_BUILD="host;AMDGPU" -DLLVM_ENABLE_PROJECTS=clang -DLLVM_ENABLE_RUNTIMES=compiler-rt -DLLVM_BINUTILS_INCDIR=/usr/local/include -DLLVM_INCLUDE_BENCHMARKS=OFF -DCLANG_DEFAULT_PIE_ON_LINUX=ON -DCLANG_CONFIG_FILE_SYSTEM_DIR=/usr/local/etc/clang -DCMAKE_VERBOSE_MAKEFILE=TRUE -DCMAKE_INSTALL_LIBDIR=lib -DCMAKE_INSTALL_LIBEXECDIR=lib/clang -Wno-dev -G Ninja ../

[static libs huge with -flto]

find . -name flags.make -type f -exec sed -i 's/ -O3 -g//g' {} \;
find . -name flags.make -type f -exec sed -i 's/ -O3//g' {} \;
find . -name link.txt -type f -exec sed -i 's/-Wl,-O3/-Wl -Os/g' {} \;
find . -name AddLLVM.cmake -type f -exec sed -i 's/-Wl,-O3/-Wl,-Os/g' {} \;
find . -name compile_commands.json -type f -exec sed -i 's/ -O3 -g//g' {} \;
find . -name build.make -type f -exec sed -i 's/ -O3 -g//g' {} \;

ninja [3h 4m 56s]
sudo ninja install

sudo mkdir /usr/local/lib/bfd-plugins
cd /usr/local/lib/bfd-plugins
sudo ln -s ../LLVMgold.so ./

[links against ncursesw without ncursesw-dev]