Sets diagnostic messages that have a specific tag to Warning severity.
The --diag_warning option behaves analogously to --diag_error, except that the compiler sets the diagnostic messages having the specified tags to warning severity rather than error severity.
This option has the #pragma equivalent #pragma diag_warning.
Where tag can be:
A diagnostic message number to set to warning severity.
error, to set all errors that can be downgraded to warnings.
--diag_warning=A1234,error causes message A1234 and all downgradable errors to be treated as warnings, providing changing the severity of A1234 is permitted.