Cannot set exception-handling-method to "js"

[tritao]

emscripten.jam has the following:

toolset.flags emscripten.compile.c++ OPTIONS <exception-handling>on/<exception-handling-method>js : -fexceptions ;
toolset.flags emscripten.link        OPTIONS <exception-handling>on/<exception-handling-method>js : -fexceptions ;
toolset.flags emscripten.compile.c++ OPTIONS <exception-handling>on/<exception-handling-method> : -fwasm-exceptions ;
toolset.flags emscripten.link        OPTIONS <exception-handling>on/<exception-handling-method> : -fwasm-exceptions ;

I am trying to get boost to compile with -fexceptions flag, right now it is defaulting to -fwasm-exceptions.

I have tried to call b2 with b2 exception-handling-method=js ....

I have also tried to add option.set exception-handling-method : js ; to project-config.jam.

Neither option seems to work, only way I have gotten a workaround is to hardcode -fwasm-exceptions to -fexceptions in emscripten.jam.

Does anyone know the right way to fix this?

[grisumbras]

Does b2 exception-handling-method=js generate any errors or does it simply not work?