-qignerrno
Category
Purpose
Allows the compiler to perform optimizations as if system calls would not modify errno.
Some system library functions set errno when an exception occurs. When ignerrno is in effect, the setting and subsequent side effects of errno are ignored. This option allows the compiler to perform optimizations without regard to what happens to errno.
Defaults
- -qnoignerrno
- -qignerrno when the -O3 or higher optimization level is in effect.
Usage
If you require both -O3 or higher and the ability to set errno, you should specify -qnoignerrno after the optimization option on the command line.
Predefined macros
__IGNERRNO__ is defined to 1 when -qignerrno is
in effect; otherwise, it is undefined.
Related information
