Problem adding std::filesystem to CMake Project

Question

I am new to CMake projects and I want to use the file system library in my project. I am running Ubuntu 18.04 with GCC 8.2 and CMake 3.13. In order to achieve this I tried t

Answer 1

Gcc 8.2. comes with , so there is no need to investigate with regard to the availability. Next, option 1 is sufficient, but needs a fix:

set(CMAKE_CXX_STANDARD 17) # no need to manually adjust the CXXFLAGS

add_executable(yourExecutable yourSourceFile.cpp)

target_link_libraries(yourExecutable stdc++fs)

This should result in compiling the sources with -std=c++17 or -std=gnu++17 and adding -lstdc++fs when linking.

Edit: Note that as @Ashkan has pointed out in the comments, setting CMAKE_CXX_STANDARD_REQUIRED to true results in an immediate error at configure time if C++17 isn't supported by the compiler, instead of a compilation error (due to the missing header) or at link time (due to the missing shared library). This might be desirable.