Compiling on GNAT 20120509

GNAT 20120509 fails to compile the project when Is_Stack_Empty or
Clear_Stack are uncommented; there are errors returned from the
assembler saying things like:
Error: symbol `emptystack' is already defined
Created a GPR project file for GPS.

The Project contains variables for the CPU, OS, and Compiler; the
project's path changes accordingly so that one-button compilation works.