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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: gcc-5.0 ?
Date: Sat, 25 Apr 2015 19:20:42 +0300
Organization: Lucas Barks
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On 21/04/15 20:09, james wrote:
> [installing  gcc 5 system-wide through portage]

Now that 5.1 is in Portage (masked), you should keep in mind that 
emerging it will result in the 5.1 libraries being used, even if you 
keep 4.9 (or 4.8) as the default compiler.

This is not really guaranteed to work well. AFAIK, the only 
fully-supported configuration is having the latest emerged gcc version 
be the default compiler. It might still be best to install 5.1 locally 
outside of portage if you don't intent to make 5.1 the default system 
compiler.