Executes the statements
between the !IF keyword and the next !ELSE or !ENDIF directive if <expression>
evaluates to a nonzero value.
The <expression> used with the !IF directive can consist of
integer constants, string constants, or exit codes returned by programs.
Integer constants can use the C unary operators for numerical negation
( - ), one's complement ( ~ ), and logical negation ( ! ). You can also
use any of the C binary operators listed below:
Operator
+
-
*
/
%
&
|
^^
&&
||
<<
>>
==
!=
<
>
<=
>=
Note:
You can use parentheses to group expressions.
Values are assumed to be decimal values unless specified with a leading
0 (octal) or leading 0x (hexadecimal).
Strings are enclosed by quotation marks ( " ). You can use the equality
( == ) and inequality ( != ) operators to compare two strings.
You can invoke a program in an expression by enclosing the program name
in square brackets ( [ ] ). The exit code returned by the program is used
in the expression.
!ELSE
Executes
the statements between the !ELSE and !ENDIF directives if the statements
preceding the !ELSE directive were not executed.
!ENDIF
Marks the end of the !IF, !IFDEF, or !IFNDEF block
of statements.
!IFDEF <macroname>
Executes
the statements between the !IFDEF keyword and the next !ELSE or !ENDIF directive
if <macroname> is defined in the description file. If a macro
has been defined as null, it is still considered to be defined.
!IFNDEF
<macroname>
Executes the statements between
the !IFNDEF keyword and the next !ELSE or !ENDIF directive if <macroname>
is not defined in the description file.
!UNDEF
<macroname>
Undefines a previously defined
macro.
!ERROR <text>
Prints
text and then stops execution.
!INCLUDE <filename>
Reads and evaluates the file <filename>
before continuing with the current description file. If <filename>
is enclosed by angle brackets (<>), NMAKE searches for the file
in the directories specified by the INCLUDE macro; otherwise, it looks only
in the current directory. The INCLUDE macro is initially set to the value
of the INCLUDE environment variable.
!CMDSWITCHES
{+|-}<opt>
Turns on or off one of four NMAKE
options: /D, /I, /N, and /S. If no options are specified, the options
are reset to the values they had when NMAKE was started. To turn an option
on, precede it with a plus sign (+); to turn it off, precede it with a minus
sign (-). This directive updates the MAKEFLAGS macro.
See Special Macros.
[Back: Predefined Inference Rules]
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