Undefines any definition currently in effect for the specified macro.
Linux: | -Uname |
Windows: | /Uname |
name |
Is the name of the macro to be undefined. |
OFF |
Macro definitions are in effect until they are undefined. |
This option undefines any definition currently in effect for the specified macro. It is equivalent to an #undef preprocessing directive.
On Windows systems, use the /u option to undefine all previously defined preprocessor values.
Visual Studio: Preprocessor > Undefine Preprocessor Definitions
Eclipse: Preprocessor > Undefine Preprocessor Definitions
None
To undefine a macro, enter the following command:
On Windows* systems:
icx /Uia64 prog1.cpp ! specific to C++
dpcpp-cl /Uia64 prog1.cpp ! specific to DPC++
On Linux* systems:
icpx -Uia64 prog1.cpp ! specific to C++
dpcpp -Uia64 prog1.cpp ! specific to DPC++
If you attempt to undefine an ANSI C macro, the compiler will emit an error:
invalid macro undefinition: <name of macro>