GCC changes for Fedora + riscv64

[Jeff Law]

On 04/10/2018 01:55 AM, Andreas Schwab wrote:
> On Apr 10 2018, Kito Cheng <kito.cheng@gmail.com> wrote:
> 
>> You can use -r option (e.g. ./qemu-riscv64 -r 4.15) or set QEMU_UNAME
>> environment variable to change the uname for qemu.
> 
> But be aware that the emulated environment still assumes that all system
> calls implemented by 4.15 are available, and qemu linux-user generally
> just passes them through to the host kernel.  If the host kernel is too
> old to provide a particular system call the emulation may malfunction.
Well understood.  For my needs it likely is a non-issue.

jeff