[intro.defs], [dcl.attr.deprecated], [cpp.error] Define the term "warning" and use where appropriate #7893
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Closes #7730.
Closes #7728.
The standard currently uses the term "warning" and "diagnostic message", but only the latter term is defined. It would be possible to purge "warning", but @jwakely suggested instead to keep both terms to retain the standard's expressiveness.
I agree with this direction, and the fix is simple.
The overwhelming majority of diagnostic messages are part of IF or IFNDR behavior, or part of an assertion or erroneous behavior, etc.. Only [cpp.error] (
#warning) and [dcl.attr.deprecated] ([[deprecated]]) say "diagnostic message" when they could clearly say "warning".