Hi Spencer,
what is your compiler version and what error message you got?

In C51 version v5.50 you can get such error message:

 ACTION: PARSING INVOKE-/#PRAGMA-LINE 
 LINE:   #pragma SRC 
 ERROR:  RESPECTIFIED OR CONFLICTING CONTROL

In this case is probably problem that there are
applied two SRC directives on the one "*.C" source file such way:

1. Command line: c51.exe FILE.C SRC
2. Inside of the FILE.C: #pragma SRC

In this case is necessary to disable one of them to correct the error problem.
Vaclav

BTW: C51 v7.01 don't generate this error message and work properly.