D
Defines a
macro name
that can be
associated with an optional value.
Syntax
Linux:
-D
name
[
=
value
]
Windows:
/D
name
[
=
value
]
Arguments
- name
- Is the name of themacro.
- 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".
IDE Equivalent
Visual Studio:
Preprocessor >
Preprocessor Definitions
Eclipse:
Preprocessor >
Preprocessor Definitions
Alternate Options
None
Example
To define a macro called SIZE with the value 100, enter the following
command:
On Windows* systems:
icx /DSIZE=100 prog1.cpp ! specific to C++
dpcpp-cl /DSIZE=100 prog1.cpp ! specific to DPC++
On Linux* systems:
icpx -DSIZE=100 prog1.cpp ! specific to C++
dpcpp -DSIZE=100 prog1.cpp ! specific to DPC++
If you define a macro, but do not assign a value, the
compiler defaults to 1 for the value of the macro.