Possibly, but see tips in

http://kripken.github.io/emscripten-site/docs/porting/Debugging.html

, building with SAFE_HEAP and ASSERTIONS etc. can find undefined behavior.
It is possible it only shows up in optimized builds (optimizer can take
advantage of undefined behavior).

- Alon


On Sun, Dec 7, 2014 at 12:31 PM, Arve Knudsen <[email protected]>
wrote:

> Hi
>
> When including optimized (-O3) ChucK (https://github.com/aknuds1/chuck)
> code in my app, it invariably breaks when loaded, with the following error
> message:
>
>      Invalid function pointer '0' called with signature 'ii'. Perhaps this
> is an invalid value (e.g. caused by calling a virtual method on a NULL
> pointer)? Or calling a function with an incorrect type, which will fail?
> (it is worth building your source files with -Werror (warnings are errors),
> as warnings can indicate undefined behavior which can cause this)
>
> The code doesn't break if I compile without optimization. I'm using
> Emscripten 1.27.0. I've tested with both Chrome and Firefox on OS X. You
> can try for yourselves at http://104.131.177.17/ (just check the console
> after loading the page).
>
> Is this due to a bug in Emscripten?
>
> Arve
>
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