linux-kernel - Re: [PATCH] kbuild: Allow to combine multiple W= levels

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Message-ID: <BANLkTikLfXCKKqgrHKy4T7JvumWc_gi7mg@mail.gmail.com>
Date:	Mon, 2 May 2011 12:17:52 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Valdis.Kletnieks@...edu, bp@...en8.de, sam@...nborg.org,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	davej@...hat.com
Subject: Re: [PATCH] kbuild: Allow to combine multiple W= levels

Hi,

On Mon, May 2, 2011 at 12:05 PM, Michal Marek <mmarek@...e.cz> wrote:
> On 2.5.2011 17:53, Arnaud Lacombe wrote:
>>
>> Hi Michal,
>>
>> On Mon, May 2, 2011 at 11:38 AM, Michal Marek<mmarek@...e.cz>  wrote:
>>>
>>> On Fri, Apr 29, 2011 at 03:31:33PM +0200, Michal Marek wrote:
>>>>
>>>> Add support for make W=12, make W=123 and so on, to enable warnings from
>>>> multiple W= levels. Normally, make W=<level>  does not include warnings
>>>> from the previous level.
>>>>
>>>> Signed-off-by: Michal Marek<mmarek@...e.cz>
>>>> ---
>>>>  scripts/Makefile.build |    8 ++++++--
>>>>  1 files changed, 6 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
>>>> index 9c0c481..28cef2a 100644
>>>> --- a/scripts/Makefile.build
>>>> +++ b/scripts/Makefile.build
>>>> @@ -60,6 +60,8 @@ endif
>>>>  # $(call cc-option, -W...) handles gcc -W.. options which
>>>>  # are not supported by all versions of the compiler
>>>>  ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
>>>> +warning-  := $(empty)
>>>> +
>>>>  warning-1 := -Wextra -Wunused -Wno-unused-parameter
>>>>  warning-1 += -Wmissing-declarations
>>>>  warning-1 += -Wmissing-format-attribute
>>>> @@ -85,9 +87,11 @@ warning-3 += -Wswitch-default
>>>>  warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
>>>>  warning-3 += $(call cc-option, -Wvla)
>>>>
>>>> -warning := $(warning-$(KBUILD_ENABLE_EXTRA_GCC_CHECKS))
>>>> +warning := $(warning-$(findstring 1,
>>>> $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
>>>> +warning += $(warning-$(findstring 2,
>>>> $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
>>>> +warning += $(warning-$(findstring 3,
>>>> $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
>>>>
>>>> -ifeq ("$(warning)","")
>>>> +ifeq ("$(strip $(warning))","")
>>>>          $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
>>>>  endif
>>>
>>> Pushed to kbuild-2.6.git#kbuild with the following make help update:
>>>
>> you did not comment on the point I raised.
>
> Valdis did. Why is it a problem that W=123 can be interchanged with W=321?
>
Because 321 != 123 and 321 > 123. As I am a dumb human being, I would
expect 321 to have a different meaning than 123, but also 321 to be
more verbose than 123. Said otherwise, humans tends to naturally
interpret 321 and 123 as number rather than concatenation of
character.

 - Arnaud

> Michal
>
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