Compile and use glibc-2.13 from source for ubuntu x86_64 architecture?

That's easy: configure --prefix=/u && make && make install Congratulations, you now have a separate libc/lipthreads under u.

I want to create a separate libc/nptl/libpthreads That's easy: . /configure --prefix=/u && make && make install. Congratulations, you now have a separate libc/lipthreads under /u and want to use it for an existing application (like apache) It's not quite clear whether you want to use your new libc with existing (prebuilt) binary, or with one you can rebuild.

If the latter, simply add -Wl,--dynamic-linker=/u/lib64/ld-linux-x86-64.so.2 (for 64-bit binaries), and you are done. If the former, and the application does not execve itself, you can invoke it like this: /u/lib64/ld-linux-x86-64.so.2 /path/to/app. If the application does exec itself, or gets invoked by multitude of shell scripts which you don't want to modify, then you'll have to binary-patch the application: replace /lib64/ld-linux-x86-64.so.2 string in the .

Dynstr section of the binary with /u/lib64/ld-2.13. So (new string has to be not longer than the old one). I am new to kernel programming Your question has nothing whatsoever to do with kernel programming.

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