ggml-backend : make path_str compatible with C++20 #12269
Merged
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#12144 breaks the compatibility with C++20
In C++20,
fs::path::u8string()return type changed fromstd::string(C++17) tostd::u8string(C++20+). This PR modifies thepath_strfunction to use conditional compilation to detect__cpp_lib_char8_t(a standard feature flag introduced in C++20):std::u8stringtostd::stringstd::stringdirectly