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This option provides the same function as #define specified in the source file.

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<string> can be defined as a macro name by specifying <macro name>=<string>.

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When only <macro name> is specified as a suboption, the macro name is assumed to be defined. Names or integer constants can be written in <string>.

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If the macro name specified by this option has already been defined in the source file by #define, #define takes priority.

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If this option is specified for more than one time, all specified macro names are valid.