How to set c++ standard to c++17

[Alan Man Lok Ng]

Hello, I want to use the filesystem library in c++17. Thank you

[loe...@gmail.com]

I believe it's sufficient to add something like this to the top of CMakeLists.txt :

include(CheckCXXCompilerFlag)

check_cxx_compiler_flag(-std=gnu++17 HAS_CXX17)

if (HAS_CXX17)

    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++17")

endif()