linux-kernel - Re: [PATCH 3/3] selftests: kcmp build fails when invoked from kselftest target

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Date:	Tue, 10 Mar 2015 16:41:39 -0600
From:	Shuah Khan <shuahkh@....samsung.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	akpm@...ux-foundation.org, tranmanphong@...il.com,
	mpe@...erman.id.au, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH 3/3] selftests: kcmp build fails when invoked from kselftest
 target

On 03/10/2015 04:09 PM, Cyrill Gorcunov wrote:
> On Tue, Mar 10, 2015 at 04:00:59PM -0600, Shuah Khan wrote:
>> kcmp Makefile doesn't have an explicit build rule. As a result,
>> kcmp build fails, when it is run from top level Makefile target
>> kselftest. Without the explicit rule, make works only when it is
>> run in the current directory or from selftests directory. Add an
>> explicit build rule to fix the problem. In addition, build fails
>> as it can't find kcmp.h. Fix it by passing CFLAGS.
>>
>> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
>> ---
>>  tools/testing/selftests/kcmp/Makefile | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/testing/selftests/kcmp/Makefile b/tools/testing/selftests/kcmp/Makefile
>> index ff0eefd..83383eb 100644
>> --- a/tools/testing/selftests/kcmp/Makefile
>> +++ b/tools/testing/selftests/kcmp/Makefile
>> @@ -1,7 +1,8 @@
>>  CC := $(CROSS_COMPILE)$(CC)
>> -CFLAGS += -I../../../../usr/include/
>> +CFLAGS += -I../../../../include/uapi -I../../../../usr/include/
>>  
>> -all: kcmp_test
>> +all:
>> +	$(CC) $(CFLAGS) kcmp_test.c -o kcmp_test
>>  
>>  run_tests: all
>>  	@./kcmp_test || echo "kcmp_test: [FAIL]"
> 
> Ho Shuah! Thanks for looking into it. I've a small question --
> why kcmp_test prerequsite is dropped? As to me it should remain
> here, except explicit build rule added.
> 

Are you looking for something like this:

all: kcmp_test

kcmp_test:
	$(CC) $(CFLAGS) kcmp_test.c -o kcmp_test

I just simplified it and removed the prerequsite.
If you prefer, I can make the change to keep the
prereq.


thanks,
-- Shuah

-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
--
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