linux-kernel - Re: [PATCH v2 1/4] selftests/Makefile: append a slash to env variable OUTPUT

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Date:   Wed, 28 Mar 2018 09:45:25 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     Shuah Khan <shuah@...nel.org>
Cc:     changbin.du@...el.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH v2 1/4] selftests/Makefile: append a slash to env
 variable OUTPUT

On Tue, Mar 27, 2018 at 03:19:26PM -0600, Shuah Khan wrote:
> On 03/26/2018 09:11 PM, changbin.du@...el.com wrote:
> > From: Changbin Du <changbin.du@...el.com>
> > 
> > The tools/build/Makefile.build use 'OUTPUT' variable as below example:
> > objprefix    := $(subst ./,,$(OUTPUT)$(dir)/)
> > 
> > So it requires the 'OUTPUT' already has a slash at the end.
> > 
> > This patch can kill below odd paths:
> > make[3]: Entering directory '/home/changbin/work/linux/tools/gpio'
> >   CC       /home/changbin/work/linux/tools/testing/selftests/gpiolsgpio.o
> >   CC       /home/changbin/work/linux/tools/testing/selftests/gpiogpio-utils.o
> >   LD       /home/changbin/work/linux/tools/testing/selftests/gpiolsgpio-in.o
> > 
> > A correct path should be:
> > /home/changbin/work/linux/tools/testing/selftests/gpio/lsgpio.o
> > 
> > Signed-off-by: Changbin Du <changbin.du@...el.com>
> 
> Are you seeing this when you run "make kselftest" - if gpio is the
> only test compile that fails, it should be fixed in gpio/Makefile,
> not is the common Makefile.
>
I only saw error in gpio, but I also saw some kselftest Makefiles having string concatenation
as '$(OUTPUT)$(dir)'. So the rule is not aligned all over. They just didn't produce any errors
so far.

By the way, is there a basic test for kselftest infrastructure? It seems it was always
reporting error when building it :(

> thanks,
> -- Shuah

-- 
Thanks,
Changbin Du