Description

This option initializes stack local variables to an unusual value to aid error detection. Normally, these local variables should be initialized in the application. It also unmasks the floating-point invalid exception.

The option sets any uninitialized local variables that are allocated on the stack to a value that is typically interpreted as a very large integer or an invalid address. References to these variables are then likely to cause run-time errors that can help you detect coding errors.

This option sets option

-g

(Linux*) and

/Zi

or

/Z7

(Windows*), which changes the default optimization level from

O2

to

-O0

(Linux) or

/Od

(Windows). You can override this effect by explicitly specifying an

O

option setting.

For more details on using options

-ftrapuv

and

/Qtrapuv

(C++)

with compiler option

O

, see the article titled Don't optimize when using -ftrapuv for uninitialized variable detection.

Another way to detect uninitialized local scalar variables is by specifying keyword

uninit

for option

check

.