PS: I’ve used CMake 3.7.1, but also tried CMake 3.17.3, and this behavior occurs with both versions. But I think it somewhat makes the set(CMAKE_CXX_STANDARD 14) line useless if I also have to explicitly specify all the features I expect from C++14 standard? I’ve noticed that I can explicitly require this particular C++ feature by adding the line target_compile_features(Tutorial PRIVATE cxx_digit_separators). How can I get CMake to require a C++14 compatible compiler version instead? I have the DevToolSet7 compiler installed (G++ 7.3.1) alongside, and I want to make sure that CMake throws an error if I accidentally use the old system compiler instead. And then at compile time g++ will throw an error because it does not support that digit separator syntax. Set(CMAKE_CXX_EXTENSIONS FALSE) # just to get c++1y instead of gnu++1y - it doesn't affect the actual problemĬMake does not throw any error when using this file with G++ 4.8.5 it simply call g++ with -std=c++1y option. I’ve used these lines in my CMakeLists.txt file: set(CMAKE_CXX_STANDARD 14) But that feature is part of C++14 standard. For example, using digit separator like int oneMillion = 1'000'000 is not supported by G++ 4.8.5 in any mode. Support is highly experimental, and will almost certainly change in incompatible ways in future releases.”.īut -std=c++1y does not enable full C++14 support with this compiler. It provides the -std=c++11 option for C++11 support, and the -std=c++1y option for “ The next revision of the ISO C++ standard, tentatively planned for 2017. My target platform (RHEL 7) ships with G++ 4.8.5, which does not support C++14 completely. Third party or platform-specific integrationsĪre useful to represent as optional dependencies.I’m just getting started with CMake and have come upon a corner case related to C++14 support with older compilers. It will not be propagated to downstream targets. (don’t) set CMAKE_CXX_STANDARD in a CMakeLists.txt:įor packagers/developers that want to use a specific version. It may be used to specify a path on the host to. The version can be made a requirement by setting to ON the variables. For each toolset that comes with this version of Visual Studio, there are variants that are themselves compiled for 32-bit ( x86) and 64-bit ( 圆4) hosts (independent. The CMAKEGENERATORTOOLSET option may be set, perhaps via the cmake (1) -T option, to specify another toolset. The CMAKESYSROOT is optional, and may be specified if a sysroot is available. These will add the needed compile options on targets (e.g. The v143 toolset that comes with VS 17 2022 is selected by default. The CMAKESYSTEMPROCESSOR is the CMake-identifier of the target architecture to build for. Set it explicitely using one of the aforementioned methods. The CMAKESYSTEMNAME is the CMake-identifier of the target platform to build for. CMake extension request you to create a CMakeLists.txt for your project, and it should be like this. In Solution Explorer wizard, right click the Source Files folder (the last one) > click Add > New Item In the Add New Item - GLFWsrc-0 wizard, click C++ File (.cpp) (the first one) from the middle of the. Click on configure, select the compiler and enter your project name. For C++ Class, C/C++ Source, and C/C++ Header file templates, CLion will prompt you to add the new file to one or several existing CMake. In CI, to make sure the minimum C++ standard is actually tested, Ctrl + Shift + P: cmake, it will show you available operation with cmake extension. See also "/root/app/build/CMakeFiles/CMakeError.log". Configuring incomplete, errors occurred! See also "/root/app/build/CMakeFiles/CMakeOutput.log". The CXX compiler identification is GNU 4.8.5 - Detecting CXX compiler ABI info - Detecting CXX compiler ABI info - done - Check for working CXX compiler: /usr/bin/c++ - skipped - Detecting CXX compile features - Detecting CXX compile features - done CMake Error at CMakeLists.txt:55 (target_compile_features): target_compile_features The compiler feature "cxx_std_17" is not known to CXX compiler "GNU" version 4.8.5. This can be done by setting CMAKE_CXX_STANDARD from a toolchain file, a packager may want to upgrade to C++20 for ABI-compatibility reasons. This allow a developer or packager to upgrade the standard seamlessly,Į.g. List of available standards in cmake-properties(7) » CXX_STANDARD. To specify the minimum standard your target requires:Ĭmake-commands(7) » target_compile_features Use target_compile_features(foo PUBLIC cxx_std_11) Set a minimum standard, not an exact standard. The goals is to minimize the boilerplate for people writing the project CMake files,Īnd to maximize the portability and easy of use for packagers or external developers. Will be consumed by packagers or external developers. We emphasize libraries that work well with the C++ Standard Library. These patterns are directed towards people writing the project CMake files,īut accounts for how the project CMake build Boost provides free peer-reviewed portable C++ source libraries.
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