[patch] libstdc++/testsuite: Tweak dg-prune-output regex for out-of-tree contexts

[Olivier Hainque]

Thanks for your prompt feedback on this Jonathan.

> On 18 Dec 2020, at 23:24, Jonathan Wakely <jwakely@redhat.com> wrote:
> 
>> Is this ok to commit ?
> 
> Yes, OK, although I wonder if this would be better:
> 
> { dg-prune-output "/(functional|bits/invoke.h):" }

Probably more robust, I agree. This still works
both with build tree (tested on mainline) and install
tree (tested on our gcc-10 branch).

Same ChangeLog.

Olivier

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