#pragma options [no]initauto
Initializes uninitialized automatic variables to a specific value, for debugging purposes.
-qnoinitauto
This option generates extra code to initialize the value of automatic variables. It reduces the runtime performance of the program and should only be used for debugging.
__INITAUTO__ is defined to the hex
value specified on the -qinitauto option or pragma;
otherwise, it is undefined.
__INITAUTO_W__ is defined to the hex
value, repeated 4 times, specified on the -qinitauto option or pragma; otherwise, it is undefined.xlc myprogram.c -qinitauto=FF