Preprocessing Directive Equivalents

You can use the -A, -D, and -U options as equivalents to preprocessing directives:

-A is equivalent to a #assert preprocessing directive
-D is equivalent to a #define preprocessing directive
-U is equivalent to a #undef preprocessing directive

Using -A

Use the -A option to make an assertion. Syntax: -Aname[(value)].

Argument	Description
name	Indicates an identifier for the assertion
value	Indicates a value for the assertion. If a value is specified, it should be quoted, along with the parentheses delimiting it.

For example, to make an assertion for the identifier fruit with the associated values orange and banana use the following command:

IA-32 Systems: prompt>icc -A"fruit(orange,banana)" prog1.c
Itanium®-based Systems: prompt>ecc -A"fruit(orange,banana)" prog1.c

Using -D

Use the -D option to define a macro. Syntax: -Dname[=value].

Argument	Description
name	The name of the macro to define.
value	Indicates a value to be substituted for name. If you do not enter a value, name is set to 1. The value should be quoted if it contains non-alphanumerics.

For example, to define a macro called SIZE with the value 100 use the following command:

IA-32 Systems: prompt>icc -DSIZE=100 prog1.c
Itanium®-based Systems: prompt>ecc -DSIZE=100 prog1.c

The -D option can also be used to define functions. For example, icc -D"f(x)=x" prog1.c.

Using -U

Use the -U option to remove (undefine) a pre-defined macro. Syntax: -Uname.

Argument	Description
name	The name of the macro to undefine.

Note

If you use -D and -U in the same compilation, the compiler processes the -D option before -U, rather than processing them in the order they appear on the command line.