8000 protoc.js fails to generate CPP files from .proto file in WASM compilation · Issue #232 · protocolbuffers/protobuf-javascript · GitHub
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BottleHe opened this issue Mar 18, 2025 · 2 comments
Open

protoc.js fails to generate CPP files from .proto file in WASM compilation #232

BottleHe opened this issue Mar 18, 2025 · 2 comments
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@BottleHe
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Hello,

While attempting to compile the library into WebAssembly (WASM), I found that the generated protoc.js cannot generate CPP files. It reports an error indicating that the proto file cannot be found. I used emsdk for the compilation.

The compilation process is as follows:

emcmake cmake -S protobuf-30.1/ -B build/ -DCMAKE_BUILD_TYPE=Release -Dprotobuf_BUILD_TESTS=OFF -Dprotobuf_BUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX=/home/username/WASM/protobuf-30.1 -DCMAKE_TOOLCHAIN_FILE=$(dirname $(which emcc))/cmake/Modules/Platform/Emscripten.cmake

cd build && emmake make -j 12

My .proto file content:

syntax = "proto2";

message test {
    required int32 mid = 1;
    required string content = 2;
}

When I try to use node protoc.js --cpp_out=. message.proto in the compilation directory, the following error occurs:

username@UserPC:~/Source/protobuf/build$ node protoc.js --cpp_out=. message.proto 
Could not make proto path relative: message.proto: No such file or directory

username@UserPC:~/Source/protobuf/build$ node -v
v21.7.3

I have tried this on both Ubuntu 22.04 and MacOS 13.6, and the results are consistent.
@dibenede
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This library only generates js code for proto messages (via --js_out. We are the protoc-gen-js plugin for protoc.

It sounds like your issue is with protoc itself. Could you please file an issue against https://github.com/protocolbuffers/protobuf ?

@dibenede dibenede added question Further information is requested triaged Issue has been triaged labels Mar 18, 2025
@BottleHe
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Ok, Thanks. I seem to have filled this question in the wrong place

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