Wam Build Error

Yomy · 25 December 2021 23:27

Hi everybody,

I’m trying to build a wam version of my plugin.
When running the ./makedist-web.sh on my mac I get the following error:

shared:INFO: (Emscripten: Running sanity checks)
emcc: error: EXPORT_NAME is not a valid JS identifier: AudioWorkletGlobalScope.WAM.MyNewPlugin
make: *** […/build-web/scripts/MyNewPlugin-wam.js] Error 1
emmake: error: ‘make --makefile MyNewPlugin-wam-processor.mk’ failed (returned 2)
IPlugWAM WASM compilation failed

I get the same error when trying to build the example plugins.
However it builds just fine when I build it on the docker.

One more thing - is it possible to load a .fxp preset file on the wam build? reading / writing any files on the server?

Thanks.

olilarkin · 26 December 2021 01:40

Hello,

Great to see people trying this

This is an issue with the latest versions of emscripten. You can hack emscripten to work around it by modifying the following line to return true

github.com

emscripten-core/emscripten/blob/89c98c744f555dfe53220944b087367b76890bb7/tools/shared.py#L668

    
      
          @staticmethod
          def is_legal_sig(sig):
            # with BigInt support all sigs are legal since we can use i64s.
            if settings.WASM_BIGINT:
              return True
            return sig == JS.legalize_sig(sig)
          
          
@staticmethod
          def isidentifier(name):
            # https://stackoverflow.com/questions/43244604/check-that-a-string-is-a-valid-javascript-identifier-name-using-python-3
            return name.replace('$', '_').isidentifier()
          
          
@staticmethod
          def make_dynCall(sig, args):
            # wasm2c and asyncify are not yet compatible with direct wasm table calls
            if settings.DYNCALLS or not JS.is_legal_sig(sig):
              args = ','.join(args)
              if not settings.MAIN_MODULE and not settings.SIDE_MODULE:
                # Optimize dynCall accesses in the case when not building with dynamic
                # linking enabled.
                return 'dynCall_%s(%s)' % (sig, args)

Yomy · 26 December 2021 13:58

Thanks a lot for the quick answer.
It works now.

The line is now in tools/js_manipulation.py line 97 in the latest version, if anybody run to this issue.

Any idea about loading presets files / audio files?

olilarkin · 26 December 2021 14:07

I talk about this a bit in this ADC presentation

For https://virtualcz.io, I just use MakePresetFromBlob() and bake in presets.

If you want to load presets and audio files at runtime, you’ll have to investigate the emscripten APIs for that kind of thing

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Wam Build Error

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