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Date: Sun, 15 Feb 2015 10:18:19 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: __mempcpy
Message-ID: <20150215091819.GD7225@calimero.vinschen.de>
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On Feb 14 23:17, Marco Atzeri wrote:
> On 2/14/2015 10:58 PM, V=C3=A1clav Zeman wrote:
> >On 14.2.2015 22:55, V=C3=A1clav Zeman wrote:
> >>On 14.2.2015 09:20, Marco Atzeri wrote:
> >>>I am trying to upgrade proftpd and also build the 64bit version.
> >>>However when building the 64bit one, I catch:
> >>>
> >>>/pub/devel/proftpd/proftpd-1.3.5-1.x86_64/build/lib/pr_fnmatch_loop.c:=
1142:
> >>>undefined reference to `__mempcpy'
> >>>
> >>>I see this difference in exported symbols for the the two archs
> >>>
> >>>32bit
> >>>$ nm /usr/lib/libcygwin.a |grep " T " |sort | grep mempcpy
> >>>00000000 T ___mempcpy
> >>>00000000 T _mempcpy
> >>>
> >>>64bit
> >>>$ nm /usr/lib/libcygwin.a |grep " T " |sort | grep mempcpy
> >>>0000000000000000 T mempcpy
> >>>
> >>>
> >>>any idea ?
> >>
> >>`__memcpy()` is their invention:
>=20
> you missed the point
>=20
> __mempcpy is exported by cygwin lib at 32bit
> but not at 64 bit.
>=20
> For both the the two arch HAVE_MEMPCPY is defined.

The 32 bit variant exports lots of underscored versions of standard
POSIX functions for historical reasons.  We didn't want to reproduce
this for the 64 bit version so the whole lot was restricted to the 32
bit export definition file.  However, __mempcpy is a GNU symbol just as
the non-underscored variant.  This has gone unnoticed when we created
the export definitions for 64 bit.

I fixed that in CVS.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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