Linaro-toolchain-builds rebuilding sysroot

Hi, I have a usecase where linaro toolchain is used to build my executables and the sysroot is copied and used as glibc for running my embedded system. Reason for this is, I want to use the same glibc what the application is compiled against.

I found a bug fix from glibc community which I want to cherry pick and rebuild the sysroot to include this fix. But, in the README.txt published with linaro toolchain binary, there are no instructions for rebuilding sysroot.

Can anyone point me to info on rebuilding sysroot? If formal steps don't exist, could you point me to the current process being followed by linaro so that I can observe the build log and attempt to do the same?

Thanks Bharath