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How to build LLVM, libclang, and liblld from source
Alternately use the pre-built binaries.
Download llvm, clang, and lld and unzip each to their own directory. Ensure no directories have spaces in them. For example:
C:\Users\Andy\llvm-10.0.0.srcC:\Users\Andy\clang-10.0.0.srcC:\Users\Andy\lld-10.0.0.src
Install Build Tools for Visual Studio 2019. Be sure to select "C++ build tools" when prompted.
- You must additionally check the optional component labeled C++ ATL for v142 build tools.
Install Python 2.7.
Install CMake 3.17.
Using the start menu, run x64 Native Tools Command Prompt for VS 2019 and execute these commands, replacing C:\Users\Andy with the correct value.
mkdir C:\Users\Andy\llvm-10.0.0.src\build-release
cd C:\Users\Andy\llvm-10.0.0.src\build-release
"c:\Program Files\CMake\bin\cmake.exe" .. -Thost=x64 -G "Visual Studio 16 2019" -A x64 -DCMAKE_INSTALL_PREFIX=C:\Users\Andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-release-mt -DCMAKE_PREFIX_PATH=C:\Users\Andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-release-mt -DCMAKE_BUILD_TYPE=Release -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="AVR" -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_USE_CRT_RELEASE=MT
msbuild /m -p:Configuration=Release INSTALL.vcxproj
mkdir C:\Users\Andy\llvm-10.0.0.src\build-debug
cd C:\Users\Andy\llvm-10.0.0.src\build-debug
"c:\Program Files\CMake\bin\cmake.exe" .. -Thost=x64 -G "Visual Studio 16 2019" -A x64 -DCMAKE_INSTALL_PREFIX=C:\Users\andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-debug -DCMAKE_PREFIX_PATH=C:\Users\andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-debug -DCMAKE_BUILD_TYPE=Debug -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="AVR" -DLLVM_ENABLE_LIBXML2=OFF -DLLVM_USE_CRT_DEBUG=MTd
msbuild /m INSTALL.vcxproj
Using the start menu, run x64 Native Tools Command Prompt for VS 2019 and execute these commands, replacing C:\Users\Andy with the correct value.
mkdir C:\Users\Andy\lld-10.0.0.src\build-release
cd C:\Users\Andy\lld-10.0.0.src\build-release
"c:\Program Files\CMake\bin\cmake.exe" .. -Thost=x64 -G "Visual Studio 16 2019" -A x64 -DCMAKE_INSTALL_PREFIX=C:/Users/Andy/llvm+clang+lld-10.0.0-x86_64-windows-msvc-release-mt -DCMAKE_PREFIX_PATH=C:/Users/Andy/llvm+clang+lld-10.0.0-x86_64-windows-msvc-release-mt -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_CRT_RELEASE=MT
msbuild /m -p:Configuration=Release INSTALL.vcxproj
mkdir C:\Users\Andy\lld-10.0.0.src\build-debug
cd C:\Users\Andy\lld-10.0.0.src\build-debug
"c:\Program Files\CMake\bin\cmake.exe" .. -Thost=x64 -G "Visual Studio 16 2019" -A x64 -DCMAKE_INSTALL_PREFIX=C:\Users\andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-debug -DCMAKE_PREFIX_PATH=C:\Users\andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-debug -DCMAKE_BUILD_TYPE=Debug -DLLVM_USE_CRT_DEBUG=MTd
msbuild /m INSTALL.vcxproj
Using the start menu, run x64 Native Tools Command Prompt for VS 2019 and execute these commands, replacing C:\Users\Andy with the correct value.
mkdir C:\Users\Andy\clang-10.0.0.src\build-release
cd C:\Users\Andy\clang-10.0.0.src\build-release
"c:\Program Files\CMake\bin\cmake.exe" .. -Thost=x64 -G "Visual Studio 16 2019" -A x64 -DCMAKE_INSTALL_PREFIX=C:\Users\Andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-release-mt -DCMAKE_PREFIX_PATH=C:\Users\Andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-release-mt -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_CRT_RELEASE=MT
msbuild /m -p:Configuration=Release INSTALL.vcxproj
mkdir C:\Users\Andy\clang-10.0.0.src\build-debug
cd C:\Users\Andy\clang-10.0.0.src\build-debug
"c:\Program Files\CMake\bin\cmake.exe" .. -Thost=x64 -G "Visual Studio 16 2019" -A x64 -DCMAKE_INSTALL_PREFIX=C:\Users\andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-debug -DCMAKE_PREFIX_PATH=C:\Users\andy\llvm+clang+lld-10.0.0-x86_64-windows-msvc-debug -DCMAKE_BUILD_TYPE=Debug -DLLVM_USE_CRT_DEBUG=MTd
msbuild /m INSTALL.vcxproj
Typically I use the path ~/local since it does not require root to install, and it's sandboxed away from the rest of my system. If there's garbage in that directory then I just wipe it and start over.
cd llvm-10.0.0.src/
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=$HOME/local -DCMAKE_PREFIX_PATH=$HOME/local -DCMAKE_BUILD_TYPE=Release -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="AVR" -DLLVM_ENABLE_LIBXML2=OFF
make install
cd lld-10.0.0.src/
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=$HOME/local -DCMAKE_PREFIX_PATH=$HOME/local -DCMAKE_BUILD_TYPE=Release
make install
cd clang-10.0.0.src/
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=$HOME/local -DCMAKE_PREFIX_PATH=$HOME/local -DCMAKE_BUILD_TYPE=Release
make install
Then add to your zig cmake line that you got from the readme:
-DCMAKE_PREFIX_PATH=$HOME/local
If you get stuck you can look at the CI testing scripts for inspiration, keeping in mind that your environment might be different: https://github.com/zig-lang/zig/tree/master/ci