Intel® C++ Compiler 19.0 Developer Guide and Reference

D

Defines a macro name that can be associated with an optional value.

Syntax

Linux and macOS:

-Dname[=value]

Windows:

/Dname[=value]

Arguments

name

Is the name of the macro.

value

Is an optional integer or an optional character string delimited by double quotes; for example, Dname=string.

Default

OFF

Only default symbols or macros are defined.

Description

Defines a macro name that can be associated with an optional value. This option is equivalent to a #define preprocessor directive.

If a value is not specified, name  is defined as "1".

CAUTION

On Linux* and macOS* systems, if you are not specifying a value, do not use D for name, because it will conflict with the -DD option.

IDE Equivalent

Visual Studio: Preprocessor > Preprocessor Definitions

Eclipse: Preprocessor > Preprocessor Definitions

Xcode: Preprocessor > Preprocessor Definitions

Alternate Options

None

Example

To define a macro called SIZE with the value 100, enter the following command:

On Windows* systems:

icl /DSIZE=100 prog1.cpp

On Linux* systems:

icpc -DSIZE=100 prog1.cpp

On macOS* systems:

icpc -DSIZE=100 prog1.cpp

If you define a macro, but do not assign a value, the compiler defaults to 1 for the value of the macro.

See Also