Re: Building XML::LibXML with libs in a non-standard location

2009/9/25 Michael Ludwig <[email protected]>:
> Folks,
>
> I'm trying to build XML::LibXML with libs in a non-standard location.
> I want the linker to pick up the libraries in /usr/local/libxml2-git.

Michael, hope you got my reply from a mobile. Now in more detail for the list:

You would either have to pass correct INC and LIBS to Makefile.PL and
your LIBS would have to include -lxml2 etc. It is much easier however
to let Makefile.PL use the xml2-config script, which gets installed
under $prefix/bin where $prefix is /usr/local/libxml2-git/. This is
done by setting PATH to PATH=$prefix/bin:$PATH.

This should be basically equivalent to perl Makefile.PL
INC=`$prefix/bin/xml2-config --cflags` LIBS=`$prefix/bin/xml2-config
--libs`, only considerably simpler.

For runtime, you still have to set LD_LIBRARY_PATH to $prefix/lib:
(the colon means all default libraries follow) or edit ld.conf, so
that the dynamic linker finds the library in $prefix/lib first.

HTH,
   Petr

> Unfortunately, it always picks up the libraries in /usr/local instead.
> The XML::LibXML version is 1.69. The LibXML2 version is 2.7.4 in
> /usr/local and Git HEAD in the non-standard location.
>
> Here's what I've done:
>
> (1) Added /usr/local/libxml2-git/lib to /etc/ld.so.conf.d/bla.conf so it
> appears before /usr/local/lib. Which works, as shown by ldconfig -p:
>
>   libxml2.so.2 (libc6) => /usr/local/libxml2-git/lib/libxml2.so.2
>   libxml2.so.2 (libc6) => /usr/local/lib/libxml2.so.2
>   libxml2.so.2 (libc6) => /usr/lib/libxml2.so.2
>   libxml2.so (libc6) => /usr/local/libxml2-git/lib/libxml2.so
>   libxml2.so (libc6) => /usr/local/lib/libxml2.so
>   libxml2.so (libc6) => /usr/lib/libxml2.so
>
> (2) Defined LD_LIBRARY_PATH and even LD_RUN_PATH, only because ldconfig
> alone didn't make the linker aware of my new libs.
>
> LD_LIBRARY_PATH=/usr/local/libxml2-git/lib
> LD_RUN_PATH=/usr/local/libxml2-git/lib
>
> (3) Passed -L option to Makefile.PL:
>
> # perl Makefile.PL LIBS='-L/usr/local/libxml2-git/lib'
>
> Doing this, I get lots of errors:
>
> LibXML.xs:1459: error: 'xmlPedanticParserDefaultValue' undeclared
> (first use in this function)
>
> Not doing this, the build works fine, but against /usr/local, not
> against my non-standard location.
>
> What am I missing?
>
> How is it meant to work?
>
> What's the significance of the steps (1), (2) and (3) described above?
> Any of it good or bad or necessary or pointless?
>
> Michael
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