After the update CMake no longer sets the right command line option for the c++ standard. From CMake 3.22 onward, CXX_EXTENSIONS is honoured whether CXX_STANDARD is set or not. CMake does not set the compiler option -std to gnu17 or c++17 although I set the targetcompilefeatures to cxxstd17 comp:gcc theshmoo I updated the versions of GCC and CMake. With CMake 3.21 or earlier, CXX_EXTENSIONS would only take effect if CXX_STANDARD was also specified, for most common compilers (since they are specified together with the one compiler flag). Note also that earlier versions of the CMake documentation did not accurately reflect the way CXX_EXTENSIONS interacts with compile features. In fact, CMake will always pick the stronger language requirement specified by either the CXX_STANDARD target property or the compile feature requirements set on the target. You can also set it from the command line or from. NOTE: If your Microsoft Visual Studio default CMake version is older than 3.23.0, you need to install CMake 3.23 (or above) and update Microsoft Visual. Then run the install step by using the install option of the cmake command (introduced in 3.15, older versions of CMake must use make install) from the command line. Now run the cmake executable or the cmake-gui to configure the project and then build it with your chosen build tool. The use of compile feature requirements (as mentioned in answer) can raise the language standard requirement. To set the standard using the default C++ toolchain in Bazel you can set environment variable BAZELCXXOPTS, e.g. That is all that is needed to create a basic local install of the tutorial. It should also be noted that CMake may upgrade the target to use a later language standard than the one specified by its CXX_STANDARD target property. Full details can be found here, but the short version goes something like this: cmake_minimum_required(VERSION 3.1)ĬMake should then select the appropriate compiler flag for the requested C++ standard based on what the compiler supports, or error out if it doesn't support the requested standard. When wanting to specify a particular C++ version, the recommended way to do this with CMake 3.1 and later is to use the CXX_STANDARD, CXX_STANDARD_REQUIRED and CXX_EXTENSIONS target properties, or their variable equivalents to specify target defaults.
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