Loading wasm built with C++ fails: missing fd_close and fd_seek

[ivannp]

A simple wasm module loads when build with C, malloc and free, but fails to load when build with C++, new and delete. The runtime error from wasmer is:

Error: 3 link errors: (1 of 3) Import not found, namespace: wasi_snapshot_preview1, name: fd_close (2 of 3) Import not found, namespace: wasi_snapshot_preview1, name: fd_seek (3 of 3) Import not found, namespace: wasi_snapshot_preview1, name: fd_write

[sbc100]

What wasi runtime are you trying to run the binary under?

It looks like the runtime is missing fd_seek and fd_write syscalls.

[ivannp]

wasmer. Opened an issue there, although I see these functions in their repo. Thanks!

[KestutisMa]

Same issue. I opened stackoverflow question: https://stackoverflow.com/questions/62680774/webassembly-instantiate-fails-when-wasm-file-was-compiled-with-clang-but-wo
I use sysroot from https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-11/wasi-sdk-11.0-mingw.tar.gz
Any progress?

[ivannp]

After the above advise, I opened an issues against wasmer. The solution proposed there worked for me.

The following changes made my code work on wasmer:

// Compile the module
wasmer_module_t *module = nullptr;
wasmer_result_t res = wasmer_compile(&module, bytes, len);

// Get the WASI version
Version version = wasmer_wasi_get_version(module);

wasmer_import_object_t *importObj = wasmer_wasi_generate_import_object_for_version(
    static_cast<unsigned char>(version),
    nullptr,
    0,
    nullptr,
    0,
    nullptr,
    0,
    nullptr,
    0);

wasmer_instance_t *instance = NULL;
res = wasmer_module_import_instantiate(&instance, module, importObj);

[sbc100]

I don't think this is an issue with the wasi-sdk is it? can we close this issue?

[sunfishcode]

This appears to be resolved; feel free to re-open if there's any followup!