Automatic -x flag generation when compiling precompiled headers

[ravisumit33]

I am trying to compile a header file as precompiled header.

em++ command for this is:
em++ -x c++-header header.h -o header.pch

But this plugin is automatically adding -x c flag at end overwriting -x c++-header flag given by me. This is causing issues and emscripten is not compiling. Is there a way to turn automatic flag adding off?