The attached patch makes ubsan emit summaries of errors it encounters. The format of these summaries is: UndefinedBehaviourSanitizer: signed-integer-overflow file:49:7 where the string is the flag name. Most of the patch is adding the flag names to all the reports all over.
This patch is stacked on top of http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20131021/091535.html , or else ubsan's tests will fail. Please review! Nick
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