If you really need latest development tools, i suggest you to switch to Fedora 22. (glibc-2.21-5 and gcc 5.1.1). It will be easier and faster than trying to modify glibc stuff in Debian 8.
Regards,
I would like to but its a requirement and i have to do it. No option.
May be if i can patch the glibc with all security patches will be enough for me.