I am trying to compile C++ code to wasm and then embed it in other C++ code with wee8 (v8's wasm-api). Currently I'm getting a Segfault on instantiating the module:
auto instance = wasm::Instance::make(store, module.get(), imports);
Note that I have no problem embedding code that I write as .wat and convert to .wasm, so the problem is specifically with embedding code compiled with emcc.
I am guessing that what I'm missing is WASI support in wee8? Does it exist? How can I enable it? Alternatively: can I ask emcc not to generate any WASI calls?
Here is a minimal example which results in:
Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)
In cpp42.cpp:
int main() {
return 42;
}
Compiling this to wasm with:
emcc -O3 cpp42.cpp -o cpp42.wasm
Inspecting the compiled wasm module with wabt's wasm2wat shows that it contains the following import
(import "wasi_snapshot_preview1" "proc_exit" (func (;0;) (type 0)))
Which I suspect to be the cause of the problem.
Then embedding with wee8 like in the examples in the repo and like I do with other wasm files causes the segfault mentioned above.
Just as another check: running
wasmer cpp42.wasm
echo $?
> 42
Works without a problem.