linux-kernel - Re: [RFC PATCH 2/2] tools build: Take CC, AS, and LD from the command line

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Date:   Wed, 4 Oct 2017 08:54:21 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Guenter Roeck <groeck@...gle.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <mmarek@...e.com>, acme@...hat.com,
        Guenter Roeck <groeck@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [RFC PATCH 2/2] tools build: Take CC, AS, and LD from the command line

Hi

On Tue, Oct 3, 2017 at 8:06 PM, Guenter Roeck <groeck@...gle.com> wrote:
> On Tue, Oct 3, 2017 at 1:48 PM, Douglas Anderson <dianders@...omium.org> wrote:
>> If the top-level tools build is called to build a tool and is passed
>> CC, AS, or LD on the command line then someone wants to use a
>> different compiler, assembler, or linker.  Let's honor that.
>>
>> This together with the change ("kbuild: Pass HOSTCC and similar to
>> tools Makefiles") allows us to properly get the HOST C Compiler used
>> when the main kernel Makefile calls into the tools.
>>
>> Signed-off-by: Douglas Anderson <dianders@...omium.org>
>> ---
>>
>>  tools/scripts/Makefile.include | 22 ++++++++++++++++++++--
>>  1 file changed, 20 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
>> index 9dc8f078a83c..00261848ec54 100644
>> --- a/tools/scripts/Makefile.include
>> +++ b/tools/scripts/Makefile.include
>> @@ -10,6 +10,20 @@ endif
>>  endif
>>  endif
>>
>> +SUBMAKE_ARGS :=
>> +
>> +# If CC, LD, or AR were passed on the command line, pass them through to the
>> +# command line of the sub-tools.
>> +ifeq ($(origin CC), command line)
>> +       SUBMAKE_ARGS += "CC=$(CC)"
>> +endif
>> +ifeq ($(origin LD), command line)
>> +       SUBMAKE_ARGS += "LD=$(LD)"
>> +endif
>> +ifeq ($(origin AR), command line)
>> +       SUBMAKE_ARGS += "AR=$(ar)"
>
> s/ar/AR/ ?

Oops!  I guess you can tell that I didn't test overriding AR, just CC and LD.

...it sounds as if my patch series was overall misguided anyway as per
<http://patchwork.kernel.org/patch/9983535>, so I won't plan to
re-spin.  Thank you for the review, though!

-Doug