RISC-V glibc Port v1

[Florian Weimer]

On 06/14/2017 10:15 PM, Palmer Dabbelt wrote:
> Do you have an idea of when there will be a 64-bit time_t clean release?  I'd
> be OK holding off on the 32-bit port for a bit, as we don't expect RV32I-based
> Linux-compatible systems to be popular.

Sorry, no idea.  I'm Cc:ing Arnd, who believe worked on the kernel side
of things.

> One sticking point is that the RV32I and RV64I base ISAs are very similar, and
> as such share a lot of code.  I'd prefer to avoid removing the rv32 code just
> to add it back in later, as that will be a big headache.
> 
> Would it be sufficient to just disallow RV32I in our preconfigure with a patch
> like this, and then turn RV32I back on when we can support a 64-bit time_t
> clean ABI?

I think that would be acceptable.  aarch64 is basically in the same boat
today (but they want to use a 32-bit time_t for their ILP32 port).

Thanks,
Florian