CODEWITHSUNDEEP
c++gccstd-filesystem
Hirek
Hirek

Reputation: 473

Linking to stdc++fs with C++20 still necessary when using filesystem?

I began using experimental::filesystem when it had just come out and I was advised to link in stdc++fs using target_link_libraries(MyTarget stdc++fs) in CMake. My programme builds either way but may I be breaking something/ doing something unnecessary if I leave out the extra link command?

This question here was asked three years ago and seems to assume that linking in stdc++fs was necessary.

Edit: compiler version is g++-9 (Homebrew GCC 9.3.0_1) 9.3.0 and CMake version is 3.16.

Many thanks!

Upvotes: 6

Views: 9218

Answers (1)

Nico J.
Nico J.

Reputation: 317

Lifted from my comment:

I guess it depends on your compiler version. From cppreference, At the very bottom of the File System Library page, you can find:

Using this library may require additional compiler/linker options. GNU implementation prior to 9.1 requires linking with -lstdc++fs and LLVM implementation prior to LLVM 9.0 requires linking with -lc++fs

en.cppreference.com/w/cpp/filesystem#Notes

As you mentioned, the following link get more in details about how to check compiler identity in cmake: How can I add a minimum compiler version requisite?

Upvotes: 7

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