Old compiler optimizations in installed headers

[Paul Eggert]

On 05/22/2015 08:03 AM, Joseph Myers wrote:
> (b) where such optimizations are present in glibc headers and only
> relevant for GCC versions before some baseline (maybe 4.1 or 4.3), we
> should be willing to remove them to simplify the code

This all sounds reasonable.  How much of a maintenance difference would 
it be to select 4.1 vs 4.3 for the baseline?  If that's significant, the 
last GCC 4.3.x release was in 2009 which is quite a while ago if we're 
talking about development environments, so I suggest going with 4.3.