[PATCH v4] configure.ac: Avoid empty subexpression in grep

[Alexey Neyman]

On 03/12/2017 11:29 AM, Paul Eggert wrote:
> Alexey Neyman wrote:
>>>
>>>> replace all the /dev/null redirects with a -q flag.
>>>
>>> That also works.
>>>
>> Version 3 of the patch attached.
>
> Hmm, sorry, I forgot about this issue:
>
> https://bugs.gnu.org/24941
>
> The problem is that in many cases
>
>    FOO | grep -q BAR
>
> will cause FOO to output a "Broken pipe" diagnostic, whereas
>
>    FOO | grep BAR >/dev/null
>
> will be quiet (and also less efficient, but nobody cares about 
> performance here). So perhaps we'd better avoid the 
> /dev/null-to-minus-q part of the change, and stick to just fixing the 
> bug at hand for now.
>
v4 attached. Using ERE and 'grep -F' instead of fgrep.

Regards,
Alexey.
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