Category
Pragma equivalent
#pragma options [no]initauto
Purpose
Initializes uninitialized automatic variables to a specific value, for debugging purposes.
Defaults
-qnoinitauto
Parameters
- hex_value
- A two-digit hexadecimal byte value.
Usage
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.
Predefined macros
__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.
Examples
To compile myprogram.c so that automatic variables are initialized
to hex value FF (decimal 255), enter:
xlc myprogram.c -qinitauto=FF