Hi, this question follows the solved one with node id 942437. On a Debian VM I've compiled the latest Perl and installed a lot of CPAN modules - including XML::Parser - into a custom folder /root/perl5.

Now I want to copy that folder on a QNAP NAS with embedded Linux (on a folder named /share/FTP/xmltv) and, following the advice of building Perl from sources by Eliya, it works quite perfectly.

There is only a problem: I'm forced to export LD_LIBRARY_PATH to run XML::Parser and that's not what I want because I want to use my spefic versions of the libraries (on /share/FTP/xmltv/lib) and not those on the QNAP (/usr/lib). Look at this code:

[/share/FTP/xmltv/bin] # export PERL5LIB=/share/FTP/xmltv/lib:/share/F
+TP/xmltv/lib/site_perl
[/share/FTP/xmltv/bin] # ./perl -e "use XML::Parser"
[/share/FTP/xmltv/bin] # find .. -name Expat.so
../lib/site_perl/5.14.2/i686-linux/auto/XML/Parser/Expat/Expat.so
[/share/FTP/xmltv/bin] # find .. -name Expat.so | xargs ldd
        linux-gate.so.1 =>  (0xb770b000)
        libexpat.so.1 => /usr/lib/libexpat.so.1 (0xb76d4000)
        libc.so.6 => /lib/libc.so.6 (0xb75a0000)
        /lib/ld-linux.so.2 (0xb770c000)
(this is NOT correct because of /usr/lib...)


[/share/FTP/xmltv/bin] # export LD_LIBRARY_PATH=/share/FTP/xmltv/lib
[/share/FTP/xmltv/bin] # find .. -name Expat.so | xargs ldd
        linux-gate.so.1 =>  (0xb7753000)
        libexpat.so.1 => /share/FTP/xmltv/lib/libexpat.so.1 (0xb771c00
+0)
        libc.so.6 => /lib/libc.so.6 (0xb75e2000)
        /lib/ld-linux.so.2 (0xb7754000)
[/share/FTP/xmltv/bin] # ./perl -e "use XML::Parser"
(this works but only because I've exported LD_LIBRARY_PATH)

[/share/FTP/xmltv/bin] # find .. -name Expat.so | xargs readelf -d | g
+rep RPATH
 0x0000000f (RPATH)          Library rpath: [/root/perl5/lib]

[download]

If you see the RPATH of the Expat.so library, which should be part of XML::Parser, it corresponds to the path of the Debian Virtual Machine where I've compiled the module.

I want to have a single root folder which can be placed anywhere (in this case /share/FTP/xmltv) on the NAS from which I can launch ./bin/perl (after exporting PERL5LIB) and all the modules have to look for their libraries inside ./lib.

I think that this could be done by specifying LDFLAGS="-R$ORIGIN/../lib" but while it does work for C, I'm not able to do this with Perl/CPAN. How can I do?

I've compiled XML::Parser in this way on the VM:

debian:~/dev# cd expat-2.0.1
debian:~/dev/expat-2.0.1# LDFLAGS="-R$ORIGIN/../lib" ./configure --pre
+fix=/root/perl5
debian:~/dev/expat-2.0.1# make && make install
debian:~/dev/expat-2.0.1# cd ..

debian:~/dev# cpan
cpan[1]> look XML::Parser
debian:~/.cpan/build/XML-Parser-2.41-dCfdKY# export LD_LIBRARY_PATH=/r
+oot/perl5/lib
debian:~/.cpan/build/XML-Parser-2.41-dCfdKY# perl Makefile.PL EXPATLIB
+PATH=/root/perl5/lib EXPATINCPATH=/root/perl5/include
debian:~/.cpan/build/XML-Parser-2.41-dCfdKY# make && make install
debian:~/.cpan/build/XML-Parser-2.41-dCfdKY# exit

[download]

As I will have to do the same for XML::LibXML and XML::LibXSLT will the eventual solution work too? Thank you.

In reply to Editing RPATH of Perl module XML::Parser by virtualdj

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