How to Resolve Linker Errors When Using `experimental::filesystem` in GCC?

Fixing Linker Error for experimental::filesystem

When attempting to utilize the latest C 1z features with GCC 6.0, particularly with the experimental::filesystem library, you may encounter a linker error like this:

undefined reference to `std::experimental::filesystem::v1::__cxx11::path::_M_split_cmpts()'

The Difference between Filesystem TS and C 1z

It's important to note that the Filesystem TS (Technical Specification) is not part of the C 1z (now C 20) standard. Hence, the error is not related to C 1z support but to linking with the appropriate library.

Linking with the Filesystem TS Library

To resolve the issue, link your code with the static library -lstdc fs. This will provide the necessary implementation for the experimental::filesystem features. Remember to place it after any objects that depend on it in the linker command.

Updates on Filesystem Support in GCC

November 2017:
GCC 8.x introduces a C 17-compliant Filesystem library under the namespace std::filesystem. It requires both -std=gnu 17 and -lstdc fs for usage.

January 2019:
GCC 9 allows the use of std::filesystem components without -lstdc fs.

April 2024:
GCC 13.3 presents experimental::filesystem symbols in -lstdc exp, alongside other experimental definitions.

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