Which Linux distributions are the developers of glibc using?

[nick]

On 2015-05-30 05:09 PM, james harvey wrote:
> I started with Redhat and moved to Fedora when it came out, and have
> stuck with it.
> 
> Trying to upgrade my glibc to the git master has, for the first time,
> exposed me to distribution-specific patches.
> 
> There can be quite a few conflicts trying to merge in the Fedora
> patches for their latest release of a package, and that project's
> current source tree.
> 
> I could be wrong, of course, but I assume the glibc developers are
> using a distribution that allows them to just install the glibc
> source, without distribution-specific patches on top to complicate
> their development.  Which ones are these?  I figure Linux From Scratch
> would qualify for what I'm looking for, but want to know my options.
> 
Arch Linux/Gentoo do this do otherwise there are few distributions that do 
this. 
Nick