Re: [PATCH 2/8] selftests: lib.mk: define CLEAN macro to allow Makefiles to override clean

[Shuah Khan <shuah@kernel.org>]

On 04/24/2017 09:45 AM, David Laight wrote:
> From: Shuah Khan
>> Sent: 22 April 2017 00:15
>> Define CLEAN macro to allow Makefiles to override common clean target
>> in lib.mk. This will help fix the following failures:
>>
>> warning: overriding recipe for target 'clean'
>> ../lib.mk:55: warning: ignoring old recipe for target 'clean'
>>
>> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
>> ---
>>  tools/testing/selftests/lib.mk | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
>> index 775c589..959273c 100644
>> --- a/tools/testing/selftests/lib.mk
>> +++ b/tools/testing/selftests/lib.mk
>> @@ -51,8 +51,12 @@ endef
>>  emit_tests:
>>  	$(EMIT_TESTS)
>>
>> -clean:
>> +define CLEAN
>>  	$(RM) -r $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES) $(EXTRA_CLEAN)
>> +endef
>> +
>> +clean:
>> +	$(CLEAN)
> 
> If might be easier to do something like:
> 
> ifneq($(NO_CLEAN),y)
> clean:
> 	$(RM) -r $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES) $(EXTRA_CLEAN)
> endif
> 
> 	David
> 

I am not sure that it is easier. Defining a macro would work well
in this case to override and also works well with what we are doing
for other overrides we already have such as EMIT_TESTS.

thanks,
-- Shuah