This may save you some trouble by knowing ahead of time what hardware and The check-$subproj and install build targets are supported for theĬLANG_INCLUDE_TESTS=ON (Required for check-clang only)īuild_llvm=`pwd`/build-llvm build_clang=`pwd`/build-clang installprefix=`pwd`/install llvm=`pwd`/llvm-project mkdir -p $build_llvm mkdir -p $installprefix cmake -G Ninja -S $llvm/llvm -B $build_llvm \ -DLLVM_INSTALL_UTILS=ON \ -DCMAKE_INSTALL_PREFIX=$installprefix \ -DCMAKE_BUILD_TYPE=Release ninja -C $build_llvm install cmake -G Ninja -S $llvm/clang -B $build_clang \ -DLLVM_EXTERNAL_LIT=$build_llvm/utils/lit \ -DLLVM_ROOT=$installprefix ninja -C $build_clang Requirements ¶īefore you begin to use the LLVM system, review the requirements given below. Required options for each sub-project can be found in the table Required to do stand-alone builds for all sub-projects. usr/lib64, then you should pass -DLLVM_ROOT=/usr/.īoth the LLVM_ROOT and LLVM_EXTERNAL_LIT options are So for example, if llvm is installed into /usr/bin and LLVM_ROOT should point to the prefix of your llvm installation, The stand-alone build needs to happen in a folder that is not the This could be a distro provided LLVM install, or you can build it yourself,Ĭmake -G Ninja -S path/to/llvm-project/$subproj \ -B $buildir_subproj \ -DLLVM_EXTERNAL_LIT=/path/to/lit \ -DLLVM_ROOT=/path/to/llvm/install/prefix Properly to be consumable by stand-alone builds of the other projects. (as described above) to do stand-alone builds, but you may also buildįor stand-alone builds, you must have an llvm install that is configured You can use the source code from a standard checkout of the llvm-project Version of the clang or llvm libraries that is already present on your Stand-alone builds allow you to build a sub-project against a pre-built Go to Directory Layout to learn about the If you get build or test failures, see below.Ĭonsult the Getting Started with LLVM section for detailed information onĬonfiguring and compiling LLVM. This will setup an LLVM build with debugging info, then compile LLVM andįor more detailed information on CMake options, see CMake theĪ basic CMake and build/test invocation which only builds LLVM and no otherĬmake -S llvm -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug Option -j NN, where NN is the number of parallel jobs, e.g. That’s done by default in Ninja for make, use the LLVM sub-projects generate their own check- target. Regression tests to ensure everything is in working order.ĬMake will generate build targets for each tool and library, and most Maximum number of compile/link jobs running at the same time.Ĭmake -build build or the build system specified You run into memory issues building LLVM, try setting this to limit the This isĮspecially important for linking since linking can use lots of memory. DLLVM_PARALLEL_JOBS=N - Limit the number ofĬompile/link jobs running in parallel at the same time. This can dramatically speed up link times DLLVM_USE_LINKER=lld - Link with the lld linker, assuming it (default is ON for Debug builds, OFF for all other build types). DLLVM_ENABLE_ASSERTIONS=ON - Compile with assertion checks enabled DCMAKE_BUILD_TYPE=type - Controls optimization level and debug Pathname of where you want the LLVM tools and libraries to be installed DCMAKE_INSTALL_PREFIX=directory - Specify for directory the full Can include any of: clang,Ĭlang-tools-extra, lldb, lld, polly, or cross-project-tests.įor example, to build LLVM, Clang, and LLD, use Subprojects you’d like to additionally build. DLLVM_ENABLE_PROJECTS='.' - semicolon-separated list of the LLVM Visual Studio - for generating Visual Studio projects and Unix Makefiles - for generating make-compatible parallel makefiles. To save storage and speed-up the checkout time, you may want to do aįor example, to get the latest revision of the LLVM project, useīuild files. Getting the Source Code and Building LLVM ¶Ĭheck out LLVM (including subprojects like Clang): – and from there into object files, using LLVM. ThisĬomponent compiles C, C++, Objective C, and Objective C++ code into LLVM bitcode It also contains basic regression tests.Ĭ-like languages use the Clang front end. Tools include an assembler, disassembler, bitcode analyzer, andīitcode optimizer. This contains all of the tools, libraries, and headerįiles needed to process intermediate representations and converts it into The LLVM project has multiple components. Host C++ Toolchain, both Compiler and Standard Library Getting the Source Code and Building LLVM
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