[cfe-dev] New warnings work, improvements to default warning behavior

[Richard Trieu via cfe-dev]

Thanks for testing out the warnings.  Always nice to get more data on how
well they are working.

On Tue, Aug 13, 2019 at 7:15 AM Nico Weber <thakis at chromium.org> wrote:

> Thanks for the heads-up!
>
> akhuang gave the combined patch a try on Chromium. The improved warnings
> found two bugs and had no false positives :)
>
> (https://bugs.chromium.org/p/chromium/issues/detail?id=992863#c1 has the
> details.)
>
> On Fri, Aug 9, 2019 at 10:16 PM Richard Trieu via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> I have been working on several patches to improve Clang warnings.  The
>> changes touch warnings that are in the default warning set or in common
>> build configurations.  I am posting these patches so interested people can
>> test the warning behavior before they committed.  In my testing, these
>> warnings have caught many interesting and hard to find bugs already.
>>
>> I've combined all the patches into one for easy testing:
>> https://reviews.llvm.org/D66048
>>
>> Individual patches, spread out:
>> https://reviews.llvm.org/D66043 - New precedence warning for mixing
>> bitwise and/or with conditional operator
>> https://reviews.llvm.org/D66044 - -Wtautological-overlap-compare to work
>> on negative numbers
>> https://reviews.llvm.org/D66045 - Better detection of same value
>> operands for tautological warnings
>> https://reviews.llvm.org/D66046 - New warning
>> -Wtautological-bitwise-compare to check for non-zero value bitwise-or in
>> bool context
>>
>> These are improvements to -Wparentheses, -Wtautological-compare, and
>> -Wtautological-overlap-compare with new warning
>> -Wtautological-bitwise-compare.
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>>
>
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