GCC 5 compatibility problems: GCC 4.10?

[Paolo Bonzini]

Hi all,

I'm encountering a few problems with GCC 5 due to code that fails to
work with GCC major releases above 4.  In particular, there are at least
problems with the kernel and with Coverity.

Unfortunately, downgrading to Fedora 21's GCC 4.9 is very hard in Fedora
22, unless you only care about the C compiler.  This is because the C++
compiler wants a matching libstdc++, and most C++ packages need the GCC
5 libstdc++ (maybe because of the ABI changes, I don't know).

Is it outrageous to ask for a "compatibility" GCC package that declares
itself as 4.10?  This is similar to how kernel 3.0 was initially
packaged as 2.6.40.  Or perhaps there is another possibility that I
haven't thought of?

Thanks,

Paolo