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Cmake compiler flags specific files11/20/2023 ![]() Printf("You are here because you have NOT defined DEFINED_IN_CLI when running cmake -DCMAKE_C_FLAGS.\n") ĬMakeLists.txt cmake_minimum_required(VERSION 3.4.1 FATAL_ERROR) Printf("You are here because you defined DEFINED_IN_CLI when running cmake -DCMAKE_C_FLAGS.\n") Printf("You are here because CLI CMAKE_C_FLAGS overwrote DEFINED_IN_CMAKELISTS, or you have NOT defined DEFINED_IN_CMAKELISTS.\n") Printf("You are here because you defined DEFINED_IN_CMAKELISTS in CMakeLists and it is not overwritten.\n") ![]() Prepare files under folder hello_world hello.c #include Change default value of CMAKE_CXX_FLAGS_DEBUG and friends in CMakeĬommand line options like CMAKE_C_FLAGS and CMAKE_CXX_FLAGS always append and never overwrite.Unfortunately, there is none for the compiler's warning level ( yet) References ![]() So you don't need to know the specific compiler/linker option. Just be aware that CMake does provide a special variable to set complier/linker flags in a platform independent way. īuild type-specific parts are appended: cmake -DCMAKE_SHARED_LINKER_FLAGS_MY_RPATH:STRING="-rpath=/home/abcd/libs/" -DCMAKE_BUILD_TYPE=MY_RPATH. So you can e.g call: cmake -E env LDFLAGS="-rpath=/home/abcd/libs/" cmake. The CMAKE_EXE_LINKER_FLAGS_INIT, CMAKE_SHARED_LINKER_FLAGS_INIT or CMAKE_MODULE_LINKER_FLAGS_INIT do combine with the evironment variable LDFLAGS to CMAKE_EXE_LINKER_FLAGS, CMAKE_SHARED_LINKER_FLAGS and CMAKE_MODULE_LINKER_FLAGS. Just that CMake's variable names depend on the target type ( EXE, SHARED or MODULE). The linker options are more or less equivalent to the compiler options. The build type specific parts are appended: cmake -DCMAKE_CXX_FLAGS_ALL_WARNINGS:STRING="-Wall" -DCMAKE_BUILD_TYPE=ALL_WARNINGS. You can easily introduce your own build type like ALL_WARNINGS. Later, CMake would expect that the user modifies the CMAKE_CXX_FLAGS cached variable directly to append things, e.g., by using an editor like ccmake commit with CMake. So you can initially call: cmake -E env CXXFLAGS="-Wall" cmake. The initial content from the cached CMAKE_CXX_FLAGS variable is a combination of CMAKE_CXX_FLAGS_INIT set by CMake itself during OS/toolchain detection and whatever is set in the CXXFLAGS environment variable. Here are some of the possibilities (excluding the more complex toolchain variants): Append Compiler Flags But there are two things you have to differentiate in CMake: the first call to generate the build environment and all consecutive calls for regenerating that build environment after changes to your CMakeLists.txt files or dependencies. Yes, you can append compiler and linker options.
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