em++  -s EXPORTED_FUNCTIONS="['_main', '_worker_function' , '_worker_function2' ]" \
    -s NO_EXIT_RUNTIME=1 \
    -s DEMANGLE_SUPPORT=1 \
    -s BUILD_AS_WORKER=1 -DBUILD_AS_WORKER  \
    -pedantic -std=c++14 \
    e3_emworker.cpp \
    -o ./e3_emworker.compiled.js