Developer Guide and Reference

Contents

w, W

Specifies the level of diagnostic messages to be generated by the compiler.

Syntax

Linux:
-w
n
Windows:
/W
n
Arguments
n
Is the level of diagnostic messages to be generated. Possible values are:
0
Enables diagnostics for errors. Disables diagnostics for warnings.
1
Enables diagnostics for warnings and errors.
2
Enables diagnostics for warnings and errors. On Linux* systems, additional warnings are enabled. On Windows* systems, this setting is equivalent to level 1 (
n
= 1).
3
Enables diagnostics for remarks, warnings, and errors. Additional warnings are also enabled above level 2 (
n
= 2). This level is recommended for production purposes.
4
Enables diagnostics for all level 3 (
n
= 3) warnings plus informational warnings and remarks, which in most cases can be safely ignored. This value is only available on Windows* systems.
5
Enables diagnostics for all remarks, warnings, and errors. This setting produces the most diagnostic messages. This value is only available on Windows* systems.
Default
n=1
The compiler displays diagnostics for warnings and errors.
Description
This option specifies the level of diagnostic messages to be generated by the compiler.
On Windows systems, option /W4 is equivalent to option /Wall.
The
-w
n
,
/W
n
, and
Wall
options can override each other. The last option specified on the command line takes precedence.
IDE Equivalent
Visual Studio:
General > Warning Level
Eclipse:
General > Warning Level
Alternate Options
None

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.