XL Fortran Enterprise Edition for AIX : User's Guide - IBM

-qkeepparm Option
Syntax
-qkeepparm | -qnokeepparm
Background Information
A procedure usually stores its incoming parameters on the stack at the entry point.
When you compile code with optimization, however, the optimizer may remove
the stores into the stack if it sees opportunities to do so.
Specifying the -qkeepparm compiler option ensures that the parameters are stored
on the stack even when optimizing. This may negatively impact execution
performance. This option then provides access to the values of incoming
parameters to tools, such as debuggers, simply by preserving those values on the
stack.
188 XL Fortran Enterprise Edition for AIX : User’s Guide