Emscripten debug flags
em++ -O0 -g4 hello_world.cpp -o hello.html --emrun -s SIMPLIFY_IFS=0 -s ASSERTIONS=2 -s SAFE_HEAP=1 -s STACK_OVERFLOW_CHECK=2 -s DEMANGLE_SUPPORT=1 -s DISABLE_EXCEPTION_CATCHING=0 -s EXPORT_ALL=1 -s EXPORT_BINDINGS=1 -s EXPORT_FUNCTION_TABLES=1 --source-map-base http://localhost:6931/