![]() The variable could be set in a user supplied toolchain file or via -D on the command line. I use Cmake to generate a Xcode project, in its build settings, the 'C++ Language Dialect' and 'C++ Standard Library settings' are 'Compiler Default', but I want to set 'C++ Language Dialect' to 'G. If a non-full path value is supplied then CMake will resolve the full path of the compiler. Enables many more warnings than the default, and sets stricter modes for some compiler features. If -DCMAKE_BUILD_TYPE=Debug is not passed, CMAKE_BUILD_TYPE is empty, and none of the extra CMAKE_CXX_FLAGS_XXX values are added, so we end with a build without -g. This variable can be set by the user during the first time a build tree is configured. Set useful compile and link flags for C++ (and C) code. Flags used by the CXX compiler during RELWITHDEBINFO builds.ĬMAKE_CXX_FLAGS_RELWITHDEBINFO:STRING=-O2 -g -DNDEBUG Flags used by the CXX compiler during RELEASE builds.ĬMAKE_CXX_FLAGS_RELEASE:STRING=-O3 -DNDEBUG Flags used by the CXX compiler during MINSIZEREL builds.ĬMAKE_CXX_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUG Flags used by the CXX compiler during DEBUG builds. That command also shows other values of interest which clarify the default behavior across built types: // Flags used by the CXX compiler during all build types. In normal builds, CMake automatically determines the toolchain for host builds based on system introspection and defaults. The first step, configuration, uses the configure script, or the cmake command directly, to configure the source for compiling. The toolchain utilities available are determined by the languages enabled. ![]() Flags used by the C compiler during DEBUG builds. Introduction CMake uses a toolchain of utilities to compile, link libraries and create archives, and other tasks to drive the build. The problem being that CMAKE sets and caches its own defaults for these, and if you try to overwrite the variables without using FORCE, the 'defaults' are never changed. Then you let your users tell you which set of flags they want to use: Using presets: cmake -presetmsvc cmake -presetgcc cmake -presetclang Using toolchains: cmake -S. WARNING: not this familiar with windows tooling, so you will need to adjust for your specific requirements. here is an example based off the info your provided. this should be set before the call to project (.). There are some extensive examples in the documentation. cache the strings in a toolchain file, then manually set the flags you need. Which gives: // Flags used by the CXX compiler during DEBUG builds. With a preset, its as simple as writing a CMakePresets.json file. ![]() The default values of CMAKE_C_FLAGS_DEBUG and CMAKE_CXX_FLAGS_DEBUG can be found as mentioned at: with: cmake -LAH. If you would really like to explicitly control the build flags for the debug you can also set them with cmake -DCMAKE_BUILD_TYPE=Debug O0 is not added by default to the Debug build, but -O0 is the default -O value as mentioned at: and on man gcc, so it normally doesn't matter. Which shows the GCC build commands as explained at: ĭoing that adds the -g flag as can be confirmed with: make VERBOSE=1 E.g. ![]() If you're using CMake 3.19+, the best thing to do is to create a preset.Ĭreate a file called CMakePresets.json next to your top-level CMakeLists.At invocation time, normally all that you need to make a debug build with CMake is: cmake -DCMAKE_BUILD_TYPE=Debug. CMake 3.15 or later supports overriding the default generator by setting the environment variable CMAKEGENERATOR. 1 I try to create CMake toolchain file for Tasking Aurix compiler (ctc) in which -c. This is actually not the best/most modern way. Select Build Configurations>Set Active> 3 External GCC - Release. ![]() Target_compile_features(foo PRIVATE cxx_std_17) Anyway, to force CMake to use the default compilers on the system path, add the following code to the beginning of your. These probably refer to GNU version 4.1 compilers on your system. Now, I know that the modern way to set compiler flags is target-specific: target_compile_options(foo PRIVATE -Werror -Wall -Wextra -pedantic) As is already written in the answer to the other question, CMake prefers the generic compiler names cc and c++ when searching for the C and C++ compilers. ![]()
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