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

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Message-ID: <4DBED641.8080605@suse.cz>
Date:	Mon, 02 May 2011 18:05:21 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Arnaud Lacombe <lacombar@...il.com>
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

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?

Michal
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