Re: update to latest gnulib, with its new dfa API

[Jim Meyering]

On Mon, Dec 19, 2016 at 2:45 PM, Norihiro Tanaka <address@hidden> wrote:
>
> On Mon, 19 Dec 2016 03:02:18 -0800
> Jim Meyering <address@hidden> wrote:
>
>> On Sun, Dec 18, 2016 at 2:45 PM, Norihiro Tanaka <address@hidden> wrote:
>> >
>> > On Sun, 18 Dec 2016 11:19:04 -0800
>> > Jim Meyering <address@hidden> wrote:
>> >
>> >> I expect to push this tomorrow, and will make a new (final?) snapshot 
>> >> then, too:
>> >
>> > If RE_ICASE is not defined as regex library is too old, it does not work.
>> > It seems that sed supports it still.
>>
>> Hi Norihiro,
>> Thanks for the feedback. Can you point to a specific type of system on
>> which sed (with this change) fails to build?
>
> No, but I seem that sed leaves support for glibc 2.2 or prior and does
> not assume that RE_ICASE macro is defined always.
>
> Now if you hope to remove it, I think "#ifdef RE_ICASE" should be
> removed.

Thanks. Removing that #ifdef is a good idea, and I've done it in the attached.
I've left the following "#ifdef RE_NO_SUB" because it is merely an
optimization, and I did not look

Any glibc-based system that is old enough to lack an RE_ICASE
definition will also be so old that it will fail the configure-time
checks for known glibc regex bugs, and that will provoke the use of
the included replacement regex functions. So there should be no
problem here. By the same argument, I have also removed the "#ifdef
RE_NO_SUB". That symbol was added to glibc back in 2004.

sed-maint-remove-useless-ifdefs.diff
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