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Notifies the user of the externally defined symbol which is not referenced during linkage through an output message.

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When an absolute file is input, this option is invalid.

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To output a message, the message option must also be specified.

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The linkage editor may output a message for the function that was inline-expanded at compilation. To avoid this, add a static declaration for the function definition.

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In any of the following cases, references are not correctly analyzed so that information shown by output messages will be incorrect.