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

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Date:	Tue, 3 Sep 2013 11:13:52 +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 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

- Sedat -

Download attachment "0008-tools-Reorder-tool-_install-install-and-clean-target.patch" of type "application/octet-stream" (3604 bytes)