For instance use lld withīUILD_SHARED_LIBS is only recommended for use by LLVM developers. LLVM_USE_LINKER:STRING Override the system’s default linker. Your native target with, for example, -DLLVM_TARGETS_TO_BUILD=X86. LLVM_TARGETS_TO_BUILD:STRING Control which targets are enabled. Into swap, permit only one link job per 15GB of RAM available on aģ2GB machine, specify -G Ninja -DLLVM_PARALLEL_LINK_JOBS=2. These options, when you use the Ninja generator, allow you CMAKE_JOBS:STRING Building the llvm toolchain can use a lot of resources, particularly CMAKE_INSTALL_PREFIX:PATH Path where LLVM will be installed when the “install” target is built. If you are using an IDE such as Visual Studio or Xcode, you should use To override the default from CMAKE_BUILD_TYPE. You can manually set LLVM_ENABLE_ASSERTIONS They typically slowĭown LLVM and Clang when enabled, but can be useful during development. ![]() Assertions are internal checks to help you find bugs.You can improve RAM usage by using lld, see Builds with debug information can use a lot of RAM and disk space and is.Optimizations make LLVM/Clang run faster, but can be an impediment for.This configures the optimization level for make or ninja builds. Used variables that control features of LLVM and enabled subprojects. Used LLVM-related Variables below for information about commonly Or execute cmake -help-variable VARIABLE_NAME. For full documentation, consult the CMake manual, Here are some of the CMake variables that are used often, along with aīrief explanation. You mayĪlso wish to control which targets LLVM enables, or which LLVMĬomponents are built see the Frequently Used LLVM-relatedĪfter CMake has finished running, proceed to use IDE project files, or start Tool for instructions, see the Usage section, below. To build MinGW makefiles if you have a POSIX shell reachable through the PATHĮnvironment variable, for instance. Itself is the correct one for your development environment. You intend to use is the only one reachable from the shell, and that the shell In this case, make sure that the toolset that This can fail if CMake can’t detect your toolset, or if it thinks that theĮnvironment is not sane enough. See the Options and variables section forĪ list of build parameters that you can modify. CMake will use default valuesįor all build parameters. Generate the files required for building LLVM. There are several methods for debugging your CMake code.ĬMake can help you debug and profile your source code.CMake will detect your development environment, perform a series of tests, and You can set these when building if you want. CMAKE_CXX_INCLUDE_WHAT_YOU_USE for iwyu.CMAKE_CXX_CLANG_TIDY can run clang-tidy to help you clean up your code.CMAKE_CXX_COMPILER_LAUNCHER can set up a compiler launcher, like ccache, to speed up your.There are several common utilities that CMake can integrate with to help you with your builds. ![]() Otherwise, you can set the release and debug flags separately. This feature is often used by package management software, in conjunction with the already mentioned CC, CXX, CUDACXX, and CUDAHOSTCXX environment variables. You canĪdopting a convention from Linux, all build types append compiler flags from the environment variables CFLAGS, CXXFLAGS, CUDAFLAGS, and LDFLAGS ( full list). Note that CMake defaults to an “empty” build type, which is neither optimized nor debug. ![]() # If there is a -lm, let's use it if (MATH_LIBRARY ) target_link_libraries (simple_lib PUBLIC $ ) endif () Optimized release build, or MinSizeRel for a minimum size release (which I’ve never used). RelWithDebInfo for a release build with some extra debug info. You can run CMake with CMAKE_BUILD_TYPE=Debug for full debugging, or To run a C++ debugger, you need to set several flags in your build. You can print extra find call information during the cmake run to standard error by adding -debug-find (CMake 3.17+).Īlternatively, CMAKE_FIND_DEBUG_MODE can be set around sections of your CMakeLists.txt to limit debug printing to a specific region. More details on this will be shown in the next section.įor now, let’s watch where CMake searches for find_. trace-source=CMakeLists.txt with -trace? Find call informationĬMake scripts can search for dependent libraries, executables and more. What is the difference? How about replacing
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