linux-kernel - Re: [PATCH 2/2] selftests/gpio: Fix OUTPUT directory in Makefile

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Date:   Wed, 21 Feb 2018 16:11:16 -0700
From:   Shuah Khan <shuahkh@....samsung.com>
To:     Daniel Díaz <daniel.diaz@...aro.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>
Cc:     linux-kselftest@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Shuah Khan <shuah@...nel.org>,
        "open list:GPIO MOCKUP DRIVER" <linux-gpio@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] selftests/gpio: Fix OUTPUT directory in Makefile

On 02/21/2018 04:04 PM, Daniel Díaz wrote:
> Hello!
> 
> 
> On 02/21/2018 04:09 PM, Andy Shevchenko wrote:
>> On Wed, Feb 21, 2018 at 11:52 PM, Daniel Díaz <daniel.diaz@...aro.org> wrote:
>>> When simply running `make' from the selftests top dir, this
>>> error shows up:
>>>
>>>   cc -O2 -g -std=gnu99 -Wall -I../../../../usr/include/ -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/uuid    gpio-mockup-chardev.c ../../../gpio/gpio-utils.o  -lmount -o gpio-mockup-chardev
>>>   cc: error: ../../../gpio/gpio-utils.o: No such file or directory
>>>   <builtin>: recipe for target 'gpio-mockup-chardev' failed
>>>   make[1]: *** [gpio-mockup-chardev] Error 1
>>>
>>> because the output directory is set to "selftests/gpio" and
>>> all binaries built from ../../../gpio/ end up there. In fact,
>>> they appear as, exempli gratia:
>>> * gpiogpio-event-mon
>>> * gpiogpio-hammer
>>> * gpioinclude/
>>> * gpiolsgpio
>>> which is wrong, as it's missing directory separator somewhere.
>>>
>>> This patch sets straight the output directory when building
>>> ../../../gpio/ so that binaries don't cross paths.
>>
>> This patch doesn't sound right like previous one.
>> Does selftest infrastructure have it's own build system like tools?
> 
> Yes. See linux/Documentation/dev-tools/kselftest.rst § "Contributing new
> tests (details)" or linux/tools/testing/selftests/lib.mk itself, which
> starts saying:
> # This mimics the top-level Makefile. We do it explicitly here so that this
> # Makefile can operate with or without the kbuild infrastructure.
> 
> 
>> Does it use tools' one?
> 
> No, as far as I can tell. If anything, it uses it only to build inside
> tools/gpio/ whatever is needed.
> 
> 
>> What's wrong with the current approach?
> 
> When building from the tools/testing/selftests/ directory, binaries end
> up in the current directory (and with an improper name), which is
> undesirable. The gpio/ selftest fails to build when make'ing from there.
> 
> This is with current master:
>   /linux/tools/testing/selftests$ make
>   make[1]: Entering directory '/linux/tools/testing/selftests/gpio'
>   [...]
>   gcc -O2 -g -std=gnu99 -Wall -I../../../../usr/include/
> gpio-mockup-chardev.c ../../../gpio/gpio-utils.o
> ../../../../usr/include/linux/gpio.h  -lmount -I/usr/include/libmount -o
> gpio-mockup-chardev
>   gcc: error: ../../../gpio/gpio-utils.o: No such file or directory
>   <builtin>: recipe for target 'gpio-mockup-chardev' failed
>   make[1]: *** [gpio-mockup-chardev] Error 1
>   make[1]: Leaving directory '/linux/tools/testing/selftests/gpio'
>   Makefile:32: recipe for target 'all' failed
>   make: *** [all] Error 2
> 
> 
>> Why do you need tools in selftests?
> 
> I'll leave that to the test author to answer, as this is only a fix in
> the Makefile, but the only part of tools needed here is tools/gpio/*,
> for make'ing the object files this test will be built against.
> 

This test depends on tools/libs built in tools/gpio. The original
commit has details on the benefits of adding this test. Adding author
to the thread for further comments.

22f6592b23ef8a0c09283bcb13087340721e1154
commit 22f6592b23ef8a0c09283bcb13087340721e1154
Author: Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>

thanks,
-- Shuah