Minimum GCC version for building glibc

[Joseph Myers]

On Tue, 4 Nov 2014, Paul Eggert wrote:

> 4.6 added anonymous structures and unions, _Static_assert, __attribute__

I don't think it added anonymous structures and unions in any sense 
relevant to glibc - rather, -std=c1x -pedantic in 4.6 allowed exactly the 
subset of anonymous structures and unions permitted in C11, which was 
already allowed as an extension in -std=gnuNN modes (and so can already be 
used in glibc, and is already used in various places).

-- 
Joseph S. Myers
joseph@codesourcery.com