linux-kernel - Re: [PATCH] kbuild: Fix silent builds with make-4

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Date:	Fri, 3 Jan 2014 10:18:49 -0600
From:	Emil Medve <Emilian.Medve@...escale.com>
To:	Michal Marek <mmarek@...e.cz>, <linux-kbuild@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: Fix silent builds with make-4

Hello Michal,


On 01/03/2014 10:01 AM, Michal Marek wrote:
> On 2013-12-05 22:56, Emil Medve wrote:
>> make-4 changed the way/order it presents the command line options
>> into MAKEFLAGS
>>
>> In make-3.8x, '-s' would always be first into a group of options
>> with the '-'/hyphen removed
>>
>> $ make -p -s 2>/dev/null | grep ^MAKEFLAGS
>> MAKEFLAGS = sp
>>
>> In make-4, '-s' seems to always be last into a group of options
>> with the '-'/hyphen removed
>>
>> $ make -s -p 2>/dev/null | grep ^MAKEFLAGS
>> MAKEFLAGS = ps
>>
>> Signed-off-by: Emil Medve <Emilian.Medve@...escale.com>
>> ---
>>  Makefile | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/Makefile b/Makefile
>> index 2c88e44..0332949 100644
>> --- a/Makefile
>> +++ b/Makefile
>> @@ -311,9 +311,15 @@ endif
>>  # If the user is running make -s (silent mode), suppress echoing of
>>  # commands
>>  
>> +ifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
>> +ifneq ($(filter %s -s%,$(MAKEFLAGS)),)
> 
> The -s% here is unnecessary for two reasons: as you say, s is always at
> the end with make 4, and even if a long option is used, the hyphen is
> omitted:
> 
> 3.82:
> $ make -s -p --no-print-directory | grep MAKEFLAGS
> MAKEFLAGS =  --no-print-directory -sp

I was wondering how to account for the '-s%' pattern so I just preserved
it for make-4

> $ ./make/make -s -p --no-print-directory | grep MAKEFLAGS
> GNUMAKEFLAGS :=
> MAKEFLAGS = ps --no-print-directory
> 
> And according to
> http://git.savannah.gnu.org/cgit/make.git/commit/?id=a674abe702cc0c017209a3186c32df050ff21f41,
> the space character is always there, even if there are no single-letter
> options. So we can do something like
> 
> ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
> 
> and avoid accidentally matching things like --debug=jobs. Does the above
> work for you?

That's fine. I'll resubmit


Cheers,

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