Query of type of memcpy (and sys_errlist) on Cygwin

[Hans-Bernhard Bröker]

Am 10.04.2016 um 05:14 schrieb Tatsuro MATSUOKA:
> Hello
> The topic was discussed on gnuplot mailing list.
> http://gnuplot.10905.n7.nabble.com/stdfn-h-error-conflicting-types-for-memcopy-and-sys-errlist-on-Cygwin-build-td20061.html
> Frorm discussion there (the topic is now pending.) ,
> I decided ask here.
> In compling gnuplot I have met errors:
> ../../gnuplot/src/stdfn.h:67:8: error: conflicting types for 'memcpy'
>   char * memcpy __PROTO((char *, char *, size_t));

Before everybody gets entirely confused, let me interject that this is 
quite certainly not an actual problem about the memcpy() declaration 
itself, but rather an extremely surprising failure of an 
autoconf-generated configure script.

The configure script in question never failed like that in years of 
usage.  Well, setting aside occasional, remarkably stubborn rebase 
problems with Cygwin's Perl DLLs, that is.  See the thread "makeinfo 
causes perl error ? Cygwin X86 download today​" from last week, also 
started by Tatsuro Matsuoka.

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