If you are running emscripten on your own c code and are trying to combine your bitcode with fmod’s bitcode, there are a bunch of flags that you will need to add, assuming WASM.
For a clue, here is how the fmodstudio.js and .wasm are made from fmod’s bitcode files.
emcc --bind -Os -s EXPORT_NAME="‘FMODModule’" -s MODULARIZE=1 -s FORCE_FILESYSTEM=1 -s EXTRA_EXPORTED_RUNTIME_METHODS="[‘cwrap’,‘setValue’,‘getValue’]" -s WASM=1 -s ALLOW_MEMORY_GROWTH=1 -o fmodstudio.js fmodstudio.bc fmod_reduced.bc
This is getting inserted into the next point release of the docs amongst other info.