Specifies the level of diagnostic
messages to be generated by the compiler.
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* and
macOS*
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
-wn,
/Wn, 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
Xcode: General > Warning
Level