[RFC] remove pre gcc-4.0 optimizations

[Mike Frysinger]

On Friday 28 December 2012 07:45:21 Andreas Jaeger wrote:
> On 12/28/2012 10:39 AM, Ondřej Bílka wrote:
> > Hello, I noticed that headers contain optimized versions for gcc as old
> > as 2.8 or before.
> > 
> > To simplify code I would remove anything older than 4.0.0 (April 20.2005)
> > as it is not relevant today.
> > 
> > Is there a minimal gcc requirement to remove more definitions?
> 
> The installed headers should support older GCC versions. I think we
> discussed this in the past (this year) but don't remember the
> resolution, please search the archives,

hmm, how old ? :)

since the switch to nptl, the installed pthread.h doesn't work with <gcc-3.  
maybe few people care though (i have seen multiple reports through Gentoo).

do you have an idea of what the thread was about that mentioned this earlier ?  
i didn't find any mention of the topic in the wiki or the manual.  seems like 
we should list it in the wiki FAQ at least.
-mike
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