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Postings from November 2003
On Tue, 21 Oct 2003 08:25:58 +0100, Alan Burlison wrote:
> Jonathan Leffler wrote:
>
>> I'll only comment that one of my problems with DBD::Informix on Solaris
>> 8 is precisely the presence of -z lazyload; for reasons I do not
>> understand, it breaks DBD::Informix. Removing the option pair from the
>> linking line (twice since it appears twice) fixes the problem. I dunno
>> what's up - it is probably an issue somewhere else in practice - but the
>> way I've got my working Perl at the moment carefully excludes -z lazyload.
>>
>> I'll take any information...
>
> Are you sure it is '-z lazyload' and not '-z ignore' that is causing the
> problem? As for diagnosis, there are a couple of tools you can use:
>
> 'dump -Lv' to examine the dependencies in an object file.
> 'ldd -r' to examine the full dependency tree
> 'export LD_DEBUG=files ' to trace the run-time linkers execution
I'm seeing this problem when linking against any shareable object which
itself links against another shareable object. For example, in my
environment, the PGPLOT package links against a shareable libpng and libz.
I can confirm that in this case, it is the '-z ignore' which causes the
problem:
==============================================
with '-z lazyload -z combreloc':
frrpt% ldd ./blib/arch/auto/PGPLOT/PGPLOT.so
libpgplot.so => /proj/axaf/sun4u-SunOS-5/lib/libpgplot.so
libpng.so.3 => /proj/axaf/sun4u-SunOS-5/lib/libpng.so.3
libz.so => /proj/axaf/sun4u-SunOS-5/lib/libz.so
libX11.so.4 => /usr/lib/libX11.so.4
libm.so.1 => /usr/lib/libm.so.1
libnsl.so.1 => /usr/lib/libnsl.so.1
libsocket.so.1 => /usr/lib/libsocket.so.1
libc.so.1 => /usr/lib/libc.so.1
libXext.so.0 => /usr/openwin/lib/libXext.so.0
libdl.so.1 => /usr/lib/libdl.so.1
libmp.so.2 => /usr/lib/libmp.so.2
libdga.so.1 => /usr/openwin/lib/libdga.so.1
/usr/platform/SUNW,Ultra-80/lib/libc_psr.so.1
frrpt% dump -Lv ./blib/arch/auto/PGPLOT/PGPLOT.so
./blib/arch/auto/PGPLOT/PGPLOT.so:
**** DYNAMIC SECTION INFORMATION ****
.dynamic:
[INDEX] Tag Value
[1] POSFLAG_1 LAZYLOAD
[2] NEEDED libpgplot.so
[3] POSFLAG_1 LAZYLOAD
[4] NEEDED libpng.so.3
[5] POSFLAG_1 LAZYLOAD
[6] NEEDED libz.so
[7] POSFLAG_1 LAZYLOAD
[8] NEEDED libX11.so.4
[9] POSFLAG_1 LAZYLOAD
[10] NEEDED libm.so.1
[11] INIT 0x60830
[12] FINI 0x6083c
[13] RUNPATH /proj/axaf/sun4u-SunOS-5/lib:/proj/axaf/sparc-SunOS-5/lib
[14] RPATH /proj/axaf/sun4u-SunOS-5/lib:/proj/axaf/sparc-SunOS-5/lib
[...]
==============================================
with '-z ignore -z lazyload -z combreloc':
frrpt% ldd ./blib/arch/auto/PGPLOT/PGPLOT.so libpgplot.so => /proj/axaf/sun4u-SunOS-5/lib/libpgplot.so
libm.so.1 => /usr/lib/libm.so.1
libX11.so.4 => /usr/openwin/lib/libX11.so.4
libnsl.so.1 => /usr/lib/libnsl.so.1
libsocket.so.1 => /usr/lib/libsocket.so.1
libc.so.1 => /usr/lib/libc.so.1
libXext.so.0 => /usr/openwin/lib/libXext.so.0
libdl.so.1 => /usr/lib/libdl.so.1
libmp.so.2 => /usr/lib/libmp.so.2
libdga.so.1 => /usr/openwin/lib/libdga.so.1
/usr/platform/SUNW,Ultra-80/lib/libc_psr.so.1
frrpt% dump -Lv ./blib/arch/auto/PGPLOT/PGPLOT.so
./blib/arch/auto/PGPLOT/PGPLOT.so:
**** DYNAMIC SECTION INFORMATION ****
.dynamic:
[INDEX] Tag Value
[1] POSFLAG_1 LAZYLOAD
[2] NEEDED libpgplot.so
[3] POSFLAG_1 LAZYLOAD
[4] NEEDED libm.so.1
[5] INIT 0x60810
[6] FINI 0x6081c
[7] RUNPATH /proj/axaf/sun4u-SunOS-5/lib:/proj/axaf/sparc-SunOS-5/lib
[8] RPATH /proj/axaf/sun4u-SunOS-5/lib:/proj/axaf/sparc-SunOS-5/lib
[...]
==============================================
Note that libpng.so and libz.so are missing when '-z ignore' is present.
I haven't had a chance to try out the DBD::Sybase module; I'll report on
that when I do.
--
Diab Jerius djerius at cfa dot harvard dot edu
vox: 617 496 7575 Harvard-Smithsonian Center for Astrophysics
fax: 617 495 7356 60 Garden St, MS 70, Cambridge MA 02138 USA
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