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From: Richard Biener <richard.guenther@gmail.com>
Date: Fri, 09 Aug 2019 08:22:00 -0000
Message-ID: <CAFiYyc2RF3xG6fnUofVynaUOoMbF1Kqe5qanxKfnjN_od9F2-w@mail.gmail.com>
Subject: Re: [PATCH] Properly detect working jobserver in gcc driver.
To: =?UTF-8?Q?Martin_Li=C5=A1ka?= <mliska@suse.cz>
Cc: Jan Hubicka <hubicka@ucw.cz>, Jakub Jelinek <jakub@redhat.com>, Jeff Law <law@redhat.com>, 	GCC Patches <gcc-patches@gcc.gnu.org>, Michael Matz <matz@suse.de>
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On Fri, Aug 9, 2019 at 10:11 AM Martin Li=C5=A1ka <mliska@suse.cz> wrote:
>
> I'm sending slightly updated version of the patch
> where I allow -flto=3Dauto in common_handle_option.

+One can also use @option{-flto=3Dauto} to either use GNU make's
+job server mode to determine the number of parallel jobs, if available.
+Or the default value for @var{n} is automatically detected based
+on number of cores.

"Use @option{-flto=3Dauto} to use GNU make's job server, if available,
or otherwise fall back to autodetection of the number of CPU threads
present in your system."

OK with that.  I still think that making -flto use a jobserver if detected
(but _not_ use the number of CPU cores by default) makes
sense as an independent change.

> Martin