Compile bug: undefined reference to std::filesystem

[Clauszy]

Git commit

9ba399d

Operating systems

Linux

GGML backends

CPU

Problem description & steps to reproduce

When compiling with gcc8 in Linux, a linking error occurred.
undefined reference to std::filesystem

First Bad Commit

No response

Relevant log output

/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `vtable for std::filesystem::__cxx11::filesystem_error'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `std::filesystem::__cxx11::directory_iterator::operator*() const'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `typeinfo for std::filesystem::__cxx11::filesystem_error'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `std::filesystem::__cxx11::path::_M_find_extension() const'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `std::filesystem::__cxx11::filesystem_error::~filesystem_error()'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `std::filesystem::status(std::filesystem::__cxx11::path const&)'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `std::filesystem::__cxx11::path::_M_split_cmpts()'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `std::filesystem::__cxx11::directory_iterator::operator++()'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `std::filesystem::__cxx11::directory_iterator::directory_iterator(std::filesystem::__cxx11::path const&, std::filesystem::directory_options, std::error_code*)'
/usr/bin/ld: ../../ggml/src/libggml.so: undefined reference to `std::filesystem::__cxx11::filesystem_error::_M_gen_what()'