What version of protobuf and what language are you using? Version: v3.9.0 (also reproduces on master). Generate Javascript code for the message definition. Create an instance of the message, set a ...

#include <emscripten.h> #include <stdio.h> extern void testFloatCallback(void(*func)(float)); void callback(float a){ printf("callback: %f\n", a); } int main(int argc ...