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Sets diagnostic messages that have a specific tag to Error severity.


This option has the #pragma equivalent #pragma diag_error.



Where tag can be:

  • A diagnostic message number to set to error severity. This is the four-digit number, nnnn, with the tool letter prefix, but without the letter suffix indicating the severity.

  • warning, to treat all warnings as errors.


The severity of the following types of diagnostic messages can be changed:

  • Messages with the number format #nnnn-D.

  • Warning messages with the number format CnnnnW.