add_koan(string_view)
if(MSVC)
    target_compile_options(string_view PRIVATE /std:c++17)
endif()

add_koan(string_view)
if(MSVC)
    target_compile_options(string_view PRIVATE /std:c++17)
endif()
if("${CMAKE_CXX_COMPILER_ID}" MATCHES "(GNU|Clang)")
    set(CMAKE_CXX_FLAGS "-std=c++17")
endif()

Use C++17 gcc/clang flags for string_view
Use C++17 gcc/clang flags for string_view
