how to use two versions of glibc simultaneously?

hi, I am currently using ubuntu 9.10 with the glibc version 2.11.1-0, well i am doing a project, that i want to test with the another version of glibc that is 2.5-58, i wanted to know following things regarding this:

How to compile the version of 2.5-58, however keeping the previous version?

How to link the existing programs with the binaries of newer version of glibc?

I would be highly obl开发者_开发知识库iged if anybody can help me!!!

Let me know if my question is not specific. Please it wud be really helpful if anybody can answer me. Thanks

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Don't mix glibc versions installed in your system. Especially don't mix programs linked against one or the other version. You will most probably break your system if you do.

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I'm not an expert at this stuff, but maybe this will help.

http://www.bitwagon.com/rtldi/rtldi.html

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There no solution in ubuntu:

http://brainstorm.ubuntu.com/idea/14774

There is "portage" to manage multiple version's libary in Gentoo:

http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=2&chap=1