llvm build from source github

stackoverflow.com › questions › 68752972 › how-do-you-build-all-of-llvm

To build everything, do this:

$ git clone --depth 1 --branch llvmorg-19.1.0 https://github.com/llvm/llvm-project.git
$ cmake -S llvm-project/llvm -B llvm-project/build \
        -DCMAKE_BUILD_TYPE=Release \
        -DLLVM_ENABLE_PROJECTS=all \
        -DLLVM_ENABLE_RUNTIMES=all
$ cmake --build llvm-project/build -j8
$ cmake --install llvm-project/build --prefix /usr/local  # or somewhere else

You might also be interested in the following build flags for the first CMake command:

-DLLVM_ENABLE_ASSERTIONS=ON -- good for debugging
-DLLVM_ENABLE_EH=ON -- enable if your application uses C++ exceptions
-DLLVM_ENABLE_RTTI=ON -- enable if your application uses C++ RTTI

Also see the upstream documentation: https://llvm.org/docs/CMake.html

Note that some of the LLVM projects can only be built with clang. I won't get into bootstrapping issues, but if the build fails, you can winnow down the list of projects from all to a subset of the following: clang, clang-tools-extra, cross-project-tests, libc, libclc, lld, lldb, openmp, polly, and pstl.

You can also reduce the list of runtimes to a subset of compiler-rt, libc, libcxx, libcxxabi, libunwind, and openmp.

Note that LLVM_ENABLE_PROJECTS and LLVM_ENABLE_RUNTIMES should not overlap. The latter builds each target with the just-built clang.

Answer from Alex Reinking on Stack Overflow

LLVM

llvm.org › docs › GettingStarted.html

Getting Started with the LLVM System — LLVM 23.0.0git documentation

This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode – and from there into object files, using LLVM. Other components include: the libc++ C++ standard library, the LLD linker, and more. Check out LLVM (including subprojects like Clang): git clone ...

Arthur O’Dwyer

quuxplusone.github.io › blog › 2018 › 04 › 16 › building-llvm-from-source

How to build LLVM from source – Arthur O'Dwyer

April 16, 2018 - Making clang will build both clang and clang++. Making cxx will build libc++ (and also libc++abi, which is included in the libcxx repo). Making check-$FOO will build and run the test suite for $FOO: ... cd $ROOT/llvm/build ./bin/llvm-lit -sv ../test/Analysis ./bin/llvm-lit -sv ../tools/clang/test/ARCMT ./bin/llvm-lit -sv ../projects/libcxx/test/std/re

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