linux-kernel - Re: [PATCH] gen_compile_command: Add support for separate KBUILD

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Message-ID: <CAD=FV=WcH=dVeVWznO7Ti5A8HBDRM=rPvvH=-XJ2o1PKXvHAQw@mail.gmail.com>
Date:   Thu, 20 Jun 2019 13:13:12 -0700
From:   Doug Anderson <dianders@...gle.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        Tom Roeder <tmroeder@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Raul E Rangel <rrangel@...omium.org>,
        Tom Hughes <tomhughes@...omium.org>,
        Ryan Case <ryandcase@...omium.org>, Yu Liu <yudiliu@...gle.com>
Subject: Re: [PATCH] gen_compile_command: Add support for separate
 KBUILD_OUTPUT directory

Hi,

On Thu, Jun 20, 2019 at 12:53 PM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> I do miss Doug's Kbuild caching patches' speedup.

You actually get quite a bit of this by grabbing a new version of
ccache (assuming you use ccache).  :-P  You still have to pay the
penalty (twice) for all the options that are tested that the compiler
_doesn't_ support, but at least you get the cache for the commands
that the compiler does support.

Specifically, make sure you have a ccache with:

    * https://github.com/ccache/ccache/pull/365
    * https://github.com/ccache/ccache/pull/370

I still have it in my thoughts to avoid the penalty for options that
the compiler doesn't support but haven't had time to work on it
recently.

-Doug