def compile_c_preprocess(targets, sources = [], properties = None):
    get_manager().engine().set_target_variable( target[1], 'C++FLAGS', '' )
    get_rspline(targets, '-TC')
    sources += bjam.call('get-target-variable',targets,'PCH_FILE')
    sources += bjam.call('get-target-variable',targets,'PCH_HEADER')