Why am I getting a linker error when using `std::experimental::filesystem` in GCC 6.0?

linker error for experimental::filesystem

When attempting to utilize the novel c 1z features in the current development version of gcc 6.0, an example program encounters a linker error:

#include <iostream>
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;

int main()
{
    fs::path p1 = "/home/pete/checkit";

    std::cout << "p1 = " << p1 << std::endl;
}

Results in the following error:

/opt/linux-gnu_6-20151011/bin/g++ --std=c++1z main.cpp -O2 -g -o go
/tmp/ccaGzqFO.o: In function \`std::experimental::filesystem::v1::__cxx11::path::path(char const (&) [36])':
/opt/linux-gnu_6-20151011/include/c++/6.0.0/experimental/bits/fs_path.h:167: undefined reference to `std::experimental::filesystem::v1::__cxx11::path::_M_split_cmpts()'
collect2: error: ld returned 1 exit status

Resolution

The Filesystem TS is distinct from C 1z support and is not part of the C 1z working draft. The linking issue can be resolved by linking with -lstdc fs to access the library.

Updates

• In GCC 8.x, the C 17 Filesystem implementation is also available in namespace std::filesystem with -std=gnu 17 or -std=c 17, but requires linking to -lstdc fs.
• In GCC 9, the C 17 filesystem components can be used without -lstdc fs.
• In GCC 13.3, the std::experimental::filesystem symbols are also available in -lstdc exp.

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