experimental developments with glibc

[John Reiser]

> Is it possible to have 2 working libc libraries in the system
> and switch between them (the one that comes with my distro (feisty)
> and another one for experimental developments...) ?

The 'chroot' facility of many Linux systems can be used for such testing.
If the changes are not too large (if they are "interface compatible")
then using LD_PRELOAD may work in many cases.

For the general case of multiple glibc on one system, then see
http://bitwagon.com/rtldi/rtldi.html  for an example of an indirect
runtime loader for x86 which enables choosing the version of glibc
on an application-by-application basis.

--