linux-kernel - Re: [PATCH] tools: perf: Fix liblk not built when using perf

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Date:	Tue, 3 Sep 2013 11:20:02 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Robert Richter <rric@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] tools: perf: Fix liblk not built when using perf_install target

On Tue, Sep 3, 2013 at 11:13 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Tue, Sep 3, 2013 at 10:56 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>> On Tue, Sep 3, 2013 at 10:48 AM, Namhyung Kim <namhyung@...nel.org> wrote:
>>> Hi,
>>>
>>> On Fri, 30 Aug 2013 18:49:05 +0200, Robert Richter wrote:
>>>> On 30.08.13 17:18:36, Sedat Dilek wrote:
>>>>> So, I tried to build perf the "official" way:
>>>>>
>>>>>    $ make -C tools/ perf_install
>>>>>
>>>>> Unfortunately, my build breaks like this:
>>>>> ...
>>>>> make[2]: Entering directory
>>>>> `~/src/linux-kernel/linux/tools/lib/traceevent'
>>>>> make[2]: Leaving directory
>>>>> `~/src/linux-kernel/linux/tools/lib/traceevent'
>>>>>     LINK perf
>>>>> gcc: error: ~/src/linux-kernel/linux/tools/lib/lk/liblk.a: No such file or directory
>>>>> make[1]: *** [perf] Error 1
>>>>> make[1]: Leaving directory `~/src/linux-kernel/linux/tools/perf'
>>>>> make: *** [perf_install] Error 2
>>>>>
>>>>> After some discussion on IRC with peterz and acme and a closer look at
>>>>> the targets in "tools/Makefile", I have noticed that the perf_install
>>>>> target misses liblk to be built beforehand.
>>>>
>>>> There are no build prerequisites on purpose for install targets.
>>>> Install targets are intended to be run with root permissions. We don't
>>>> want to create/overwrite files in the build directory as root while
>>>> running install rules. Thus, you always need to run:
>>>>
>>>>  $ make -C tools/ perf
>>>>
>>>> or similar first.
>>>
>>> But AFAIK install target usually depends on build targets on many
>>> projects.  And perf too already does the same:
>>>
>>>   [ tools/perf/Makefile ]
>>>   install-bin: all
>>>         ...
>>>
>>>   install: install-bin
>>>
>>>
>>> So if you really concern the permission problem, install target should
>>> not build perf itself, right?  But in this case, it tried to build perf
>>> but failed to do it on liblk.
>>>
>>>>
>>>>> On the contrary the perf_clean target invokes to clean liblk when perf
>>>>> is cleaned.
>>>>>
>>>>> [ tools/Makefile ]
>>>>> ...
>>>>> perf_clean: liblk_clean
>>>>>      $(call descend,$(@:_clean=),clean)
>>>>> ...
>>>>>
>>>>> Fix this by adding liblk target to perf_install target.
>>>>
>>>> So no, this is not the proper fix.
>>>>
>>>> Before installing you *need* to build. You might want to fix the
>>>> documenation...
>>>
>>> Hmm.. I don't know.  What I'm curious about is why it didn't build liblk
>>> during building perf.
>>>
>>
>> The day I fell over that perf stuff, I created a pile of patches
>> fixing that unbeloved tools stuff.
>> Some tools listed in tools/Makefile are not buildable via...
>>
>>      $ make -C tools/ <tool>
>>      $ make -C tools/ <tool>_install
>>
>> ...because some <tool> have no "install" target.
>>
>> I attach the patchset here. It has no "proper" changelogs.
>> The series is "incomplete"... needs some more love... eat it carefully.
>>
>
> Attached 0008 v2.
>
> * move cpupower to tools where sources are below power-dir.
> * selftests is always last target
>

Grrr, space/tabs :-(.

0008 v3 attached.

- Sedat -

Download attachment "0008-tools-Reorder-tool-_install-install-and-clean-target.patch" of type "application/octet-stream" (3576 bytes)