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-Uname

Removes (undefines) any initial definition of a symbol name as defined by -Dname. You can use this method to remove a symbol name instead of using #undef in the source code. You can use more than one -Uname argument on the command line. This argument has no effect if you use the -no_cpp argument. If you define and undefine a name on the same command line, undefining takes precedence.