removed stdc++fs

[JaredTweed]

Why drop -lstdc++fs from whisper.cpp’s CMakeLists?

1. The extra library vanished from modern GCC – beginning with GCC 13 the standalone libstdc++fs archive was removed; the symbols are now built into the normal C++ runtime, so the linker flag causes hard failures on any tool-chain ≥ 13 ( /usr/bin/ld: cannot find -lstdc++fs ).

2. C++17 made it obsolete – since GCC 9, std::filesystem is a fully-standard header in <filesystem> and no longer lives in <experimental/filesystem>, so no explicit link option is required.

3. Keeping the flag blocks Flatpak and cross-arch builds – many Flatpak runners (e.g. GNOME 48) already ship GCC 14; the flag currently breaks both x86-64 and aarch64 sandbox builds of whisper.cpp.

4. Upstream consensus – other OSS projects (LLVM, CMake, Dolphin Emu, etc.) have removed the flag for exactly the same reason.

5. No functional downside – when using older GCC (< 9) the flag is still unnecessary because those versions fall back to the static archive automatically when std::filesystem symbols are unresolved.

[ggerganov]

The flag was added in ggml-org/llama.cpp#12094

cc @ericcurtin We should recommend to upgrade the compiler when the issue appears again.

[ggerganov]

We still have to keep dl:

target_link_libraries(ggml PRIVATE dl)

[ericcurtin]

@hbuxiaofei does this work for you?

Maybe you can put in a little conditional to add the flag for your centos8 case

I wouldn't block on @hbuxiaofei responding, we should favour the newest distros, centos8 is a bit long in the tooth for llama.cpp

[ericcurtin]

Maybe the centos8 solution is upgrade the compiler like @ggerganov says, I think you can do that by installing one of the Developer Toolsets

[ericcurtin]

Ignore my approval, need the dl

[danielzgtg]

hard failures on any tool-chain ≥ 13 ( /usr/bin/ld: cannot find -lstdc++fs ).
Keeping the flag blocks Flatpak

Can you provide logs and the exact steps to get the error? It links fine on g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0 / -- The CXX compiler identification is GNU 14.2.0, which is "≥ 13".

The linker command used is:

$ cd build; rg 'stdc\+\+fs'
ggml/src/CMakeFiles/ggml.dir/link.txt
1:/usr/bin/c++ -fPIC -O3 -DNDEBUG -shared -Wl,-soname,libggml.so -o libggml.so "CMakeFiles/ggml.dir/ggml-backend-reg.cpp.o"  -Wl,-rpath,/home/home/CLionProjects/whisper.cpp/build/ggml/src: -ldl -lstdc++fs libggml-cpu.so libggml-base.so

Aside from the lack of logs, I'm not opposed to this change as the build still succeeds with it.

[JaredTweed]

Ignore my approval, need the dl

Great, I just added the dl.