How to enable preprocessing evaluation when compiling code using GreenHills? : I am trying to do the following evaluation:

    #if ( X != 0 )
    do something
    #endif

When I compile the code it throws the following errors:

#57: this operator is not allowed in a constant expression
#58: this operator is not allowed in a preprocessing expression

Am I missing any flag or something I need to set in order to be able to make this work? I am using Green Hills compiler.