[PATCH] Deduce automatically number of cores for -flto option.

[Martin Liška]

On 7/23/19 11:20 AM, Jan Hubicka wrote:
> Hi,
> great you found time to make this. It should become the default for
> -flto IMO.

Works for me. Then I'm suggesting to not come up with -flto=auto and
only document that -flto passed during linking will automatically detect
number of cores. It's the same what clang does.

> 
> I think we also should auto-detect the case where jobserver is available
> and in that case let make to connect to the outer jobserver.  (We should
> also really convince make developers to invent way to connect to it w/o
> the extra + role)

Good idea, however, I don't have any experience with make and I'm leaving that
to you as a follow up improvement.

Martin
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