ftrapuv, Qtrapuv
, Qtrapuv
Initializes stack local variables to an
unusual value to aid error detection.
Syntax
Linux:
-ftrapuv
Windows:
/Qtrapuv
(C++
only)
Windows:
None
(DPC++ only)
Arguments
None
Default
- OFF
- The compiler does not initialize local variables.
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
with
compiler option
/Qtrapuv
(C++)
O
, see the article in Intel® Developer Zone titled
Don't optimize when using -ftrapuv for uninitialized variable
detection
, which is located in
https://software.intel.com/content/www/us/en/develop/articles/dont-optimize-when-using-ftrapuv-for-uninitialized-variable-detection.html.
Another way to detect uninitialized local scalar
variables is by specifying keyword
uninit
for option
check
.
IDE Equivalent
Visual Studio:
None
Eclipse:
Run-Time > Initialize
Stack Variables to an Unusual Value
Alternate Options
None