w, W

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

Syntax

Linux:

-wn

Windows:

/Wn

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 -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

Alternate Options

None

See Also

Para obtener información más completa sobre las optimizaciones del compilador, consulte nuestro Aviso de optimización.