cmake

cmake and libpthread

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@Manuel was part way there. You can add the compiler option as well, like this: If you have CMake 3.1.0+, this becomes even easier: set(THREADS_PREFER_PTHREAD_FLAG ON) find_package(Threads REQUIRED) target_link_libraries(my_app PRIVATE Threads::Threads) If you are using CMake 2.8.12+, you can simplify this to: find_package(Threads REQUIRED) if(THREADS_HAVE_PTHREAD_ARG) target_compile_options(my_app PUBLIC “-pthread”) endif() if(CMAKE_THREAD_LIBS_INIT) target_link_libraries(my_app “${CMAKE_THREAD_LIBS_INIT}”) endif() Older CMake … Read more

How do I add a linker or compile flag in a CMake file?

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Note: Given CMake evolution since this was answer was written in 2012, most of the suggestions here are now outdated/deprecated and have better alternatives. Suppose you want to add those flags (better to declare them in a constant): SET(GCC_COVERAGE_COMPILE_FLAGS “-fprofile-arcs -ftest-coverage”) SET(GCC_COVERAGE_LINK_FLAGS “-lgcov”) There are several ways to add them: The easiest one (not clean, … Read more

CMake: Print out all accessible variables in a script

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Using the get_cmake_property function, the following loop will print out all CMake variables defined and their values: get_cmake_property(_variableNames VARIABLES) list (SORT _variableNames) foreach (_variableName ${_variableNames}) message(STATUS “${_variableName}=${${_variableName}}”) endforeach() This can also be embedded in a convenience function which can optionally use a regular expression to print only a subset of variables with matching names function(dump_cmake_variables) … Read more

What are the differences between Autotools, Cmake and Scons?

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In truth, Autotools’ only real ‘saving grace’ is that it is what all the GNU projects are largely using. Issues with Autotools: Truly ARCANE m4 macro syntax combined with verbose, twisted shell scripting for tests for “compatibility”, etc. If you’re not paying attention, you will mess up cross-compilation ability (It should clearly be noted that … Read more

Switching between GCC and Clang/LLVM using CMake

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CMake honors the environment variables CC and CXX upon detecting the C and C++ compiler to use: $ export CC=/usr/bin/clang $ export CXX=/usr/bin/clang++ $ cmake .. — The C compiler identification is Clang — The CXX compiler identification is Clang The compiler specific flags can be overridden by putting them into a make override file … Read more

Using CMake with GNU Make: How can I see the exact commands?

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When you run make, add VERBOSE=1 to see the full command output. For example: cmake . make VERBOSE=1 Or you can add -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON to the cmake command for permanent verbose command output from the generated Makefiles. cmake -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON . make To reduce some possibly less-interesting output you might like to use the following options. The … Read more

How to properly add include directories with CMake

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Two things must be done. First add the directory to be included: target_include_directories(test PRIVATE ${YOUR_DIRECTORY}) In case you are stuck with a very old CMake version (2.8.10 or older) without support for target_include_directories, you can also use the legacy include_directories instead: include_directories(${YOUR_DIRECTORY}) Then you also must add the header files to the list of your … Read more

Define preprocessor macro through CMake?

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For a long time, CMake had the add_definitions command for this purpose. However, recently the command has been superseded by a more fine grained approach (separate commands for compile definitions, include directories, and compiler options). An example using the new add_compile_definitions: add_compile_definitions(OPENCV_VERSION=${OpenCV_VERSION}) add_compile_definitions(WITH_OPENCV2) Or: add_compile_definitions(OPENCV_VERSION=${OpenCV_VERSION} WITH_OPENCV2) The good part about this is that it circumvents … Read more

How do I activate C++ 11 in CMake?

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CMake 3.1 introduced the CMAKE_CXX_STANDARD variable that you can use. If you know that you will always have CMake 3.1 or later available, you can just write this in your top-level CMakeLists.txt file, or put it right before any new target is defined: set (CMAKE_CXX_STANDARD 11) If you need to support older versions of CMake, … Read more

What is CMake equivalent of ‘configure –prefix=DIR && make all install ‘?

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You can pass in any CMake variable on the command line, or edit cached variables using ccmake/cmake-gui. On the command line, cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr . && make all install Would configure the project, build all targets and install to the /usr prefix. The type (PATH) is not strictly necessary, but would cause the Qt based cmake-gui … Read more

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