Issue a helpful warning rather than ignoring the error in release mode
builds.
Change-Id: Iea7bf4d63f8227abaf7dcf1700c5fef62763afad
Task-number: QTBUG-17582
Reviewed-by: Rohan McGovern
(cherry picked from commit 6f082a3fdd368cd7a969b7f324354583d081da82)
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12