Jim Apple has posted comments on this change.

Change subject: Add a build flag for the undefined behavior sanitizer, aka 
"ubsan".
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Patch Set 2:

> (1 comment)

Yeah, it's counterintuitive.

Given that new information, if I can remove any overflows from our testsuite 
using UBSAN and show -fwrapv does not hurt our benchmarks and get codegenned 
code to use -fwrap just like non-codegenned code can with just this flag, wold 
you be OK with using -fwrapv?

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Gerrit-MessageType: comment
Gerrit-Change-Id: I88c7234bd7c5eb7404490a0913d90470c10835e7
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Jim Apple <[email protected]>
Gerrit-Reviewer: Dan Hecht <[email protected]>
Gerrit-Reviewer: Jim Apple <[email protected]>
Gerrit-Reviewer: Tim Armstrong <[email protected]>
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