[cfe-dev] Testing libc++ ToT against Clang ToT

[Eric Fiselier via cfe-dev]

I maintain most of the bots in question here.

I attempt to keep the Clang version under test as close to ToT as possible,
but it's still a manual process.

I don't want to force most libc++ bots to build Clang before running the
tests, as rebuilding Clang all the time will take a long time.
However, I'll look into setting up a bot that does a full bootstrap which
includes testing libc++.

On Tue, Oct 9, 2018 at 4:41 PM Louis Dionne via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Note: I'm sending this to cfe-dev because I want to have more exposure
> than only libcxx-dev.
>
> Hi,
>
> Two recent changes in Clang broke libc++ tests:
>
> r343131: https://bugs.llvm.org/show_bug.cgi?id=39232
> r342605: http://bugs.llvm.org/show_bug.cgi?id=39234
>
> Those failures were apparently not caught by the builders because we don't
> seem to test libc++ ToT against Clang ToT (aka Stage 2 build). In the
> future, it would be great to catch those failures earlier and notify the
> commit authors instead of having to painstakingly bisect the errors after
> the fact.
>
> I have the following questions:
> 1. Is there currently a build bot that tests libc++ ToT against Clang ToT?
> 2. If not, is it easy for someone to set one up?
>
> Louis
>
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>
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