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/UName, /u - Remove Predefined Names

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These options undefine previously defined symbols. /U undefines the specified symbol. /u undefines all previously defined symbols.

These names are useful in writing portable programs. For instance, you can use them with compiler directives to conditionally compile parts of a program, depending what processor and operating system you use.

One or more spaces can separate /U and Name. You can specify more than one /U option on the same command line. You can define an unlimited number of identifiers.

Neither option can undefine symbols created with the #define directive.

See Also

Predefined Preprocessor Identifiers

 Last updated on Thursday, April 08, 2004

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