linux-kernel - Re: [RFC PATCH 1/2] kbuild: Add a cache for generated variables

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Date:   Thu, 5 Oct 2017 13:58:47 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Michal Marek <mmarek@...e.com>,
        Guenter Roeck <groeck@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        Marcin Nowakowski <marcin.nowakowski@...tec.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Behan Webster <behanw@...verseincode.com>,
        Arnd Bergmann <arnd@...db.de>,
        Mark Charlebois <charlebm@...il.com>,
        Cao jin <caoj.fnst@...fujitsu.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFC PATCH 1/2] kbuild: Add a cache for generated variables

Hi,

On Thu, Oct 5, 2017 at 12:26 AM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> As far as I tested, I always see only one space after ":=" in v2.
>
> I did not consider this deeply,
> but something is working nicely behind the scene.

Try adding this to the end of the main Makefile:

+$(info LDFLAGS_BUILD_ID = $(LDFLAGS_BUILD_ID))
+$(info KBUILD_ARFLAGS = $(KBUILD_ARFLAGS))
+$(info KBUILD_CFLAGS = $(KBUILD_CFLAGS))
+$(info KBUILD_AFLAGS = $(KBUILD_AFLAGS))
+$(info KBUILD_CPPFLAGS = $(KBUILD_CPPFLAGS))
+$(info REALMODE_CFLAGS = $(REALMODE_CFLAGS))
+
 endif  # skip-makefile

Record what you see.  Then apply my patches and run your build again
(actually, run it twice and look at the 2nd time, just to be sure).  I
think you'll see slightly different spacing in the flags for the two
runs.  I don't think this is terribly important, though.

-Doug