Date: Tue, 06 Dec 2011 23:41:34 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Martin Matuska <mm@FreeBSD.org> Cc: FreeBSD current <freebsd-current@FreeBSD.org>, FreeBSD Ports <freebsd-ports@FreeBSD.org> Subject: Re: binutils-2.22: ld and --copy-dt-needed-entries Message-ID: <4EDE8C0E.7050806@FreeBSD.org> In-Reply-To: <4EDE8816.7030505@FreeBSD.org> References: <4EDE474C.8090600@FreeBSD.org> <4EDE8816.7030505@FreeBSD.org>
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on 06/12/2011 23:24 Martin Matuska said the following:
> On 6.12.2011 17:48, Andriy Gapon wrote:
>> Just for your information.
>> It seems that ld from binutils-2.22 by default has --no-copy-dt-needed-entries
>> behavior, and so explicit --copy-dt-needed-entries is now needed where the
>> previous default behavior is relied upon.
>>
>> A short excerpt from the man page for your convenience:
>>
>>> This option also has an effect on the resolution of symbols in
>>> dynamic libraries. With --copy-dt-needed-entries dynamic libraries
>>> mentioned on the command line will be recursively searched,
>>> following their DT_NEEDED tags to other libraries, in order to
>>> resolve symbols required by the output binary. With the default
>>> setting however the searching of dynamic libraries that follow it
>>> will stop with the dynamic library itself. No DT_NEEDED links will
>>> be traversed to resolve symbols.
> What do we do with this?
> We can go back, patch to behave as before or to continue.
> Are there any serious complaints?
I am not sure. Eventually all upstreams of our ports will have to deal with
this. So far I've encountered only one problematic port (gegl) that links a
binary with -lglib-2.0 expecting that a required -liconv dependency would be
automatically picked up via DT_NEEDED. libglib-2.0.so indeed has a DT_NEEDED
entry for libiconv.so. But this dependency is not explicitly advertised via
pkg-config metadata:
$ fgrep -i Libs /usr/local/libdata/pkgconfig/glib-2.0.pc
Libs: -L${libdir} -lglib-2.0
Libs.private: -liconv
So there could be other issues related to this in the future.
Perhaps this is actually an issue with glib, maybe it should have -liconv in
Libs. I am not really knowledgeable about his stuff.
--
Andriy Gapon
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