[llvm] r291918 - Fix UBSan bots by blacklisting bits/stl_tree.h.

[Hans Wennborg via llvm-commits]

The source is also released, so a user might build it with UBSan
themselves, perhaps as part of a larger project they'd like to be
UBSan clean?

On Fri, Jan 27, 2017 at 9:58 AM, Ivan Krasin <krasin at google.com> wrote:
> Probably not. This blacklist only applies to Clang profiled with UBSan,
> which is not what we release. The end users won't see or use this blacklist.
> Sorry, if the naming is confusing.
>
> On Fri, Jan 27, 2017 at 9:54 AM, Hans Wennborg <hans at chromium.org> wrote:
>>
>> On Fri, Jan 13, 2017 at 9:30 AM, Ivan Krasin via llvm-commits
>> <llvm-commits at lists.llvm.org> wrote:
>> > Author: krasin
>> > Date: Fri Jan 13 11:30:10 2017
>> > New Revision: 291918
>> >
>> > URL: http://llvm.org/viewvc/llvm-project?rev=291918&view=rev
>> > Log:
>> > Fix UBSan bots by blacklisting bits/stl_tree.h.
>> >
>> > Summary:
>> > libstdc++ has some undefined behavior in bits/stl_tree.h that
>> > has recently became excercised by some of the LLVM code.
>> > Given that fixing libstdc++ will take years, adding the file
>> > into a blacklist to fix bots seems like a necessity.
>> >
>> > Reviewers: vitalybuka
>> >
>> > Subscribers: llvm-commits, mgorny
>> >
>> > Differential Revision: https://reviews.llvm.org/D28686
>>
>> Should we merge this to 4.0?
>>
>> Probably not a huge benefit, but it seems pretty risk free, and maybe
>> nice to have if someone tries to run ubsan on the released version.
>
>