linux-kernel - Re: [PATCH v2] kbuild: check for pkg-config on make {menu,n,g,x}config

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Date:   Fri, 18 May 2018 14:10:43 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kbuild <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjørn Forsman <bjorn.forsman@...il.com>
Subject: Re: [PATCH v2] kbuild: check for pkg-config on make {menu,n,g,x}config

Hi Randy,

2018-04-07 6:37 GMT+09:00 Randy Dunlap <rdunlap@...radead.org>:
> On 03/14/2018 10:50 PM, Masahiro Yamada wrote:
>> 2018-03-13 11:30 GMT+09:00 Randy Dunlap <rdunlap@...radead.org>:
>>> From: Randy Dunlap <rdunlap@...radead.org>
>>>
>>> Each of 'make {menu,n,g,x}config' uses (needs) pkg-config to make sure
>>> that other required files are present, but none of these check that
>>> pkg-config itself is present.  Add a check for all 4 of these targets.
>>>
>>> Fixes kernel bugzilla #77511:
>>> https://bugzilla.kernel.org/show_bug.cgi?id=77511
>>>
>>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>>> ---
>>> v2: use 'command -v' instead of 'which'
>>>
>>> I'm also OK with just documenting the pkg-config requirement in
>>> Documentation/Changes (= Documentation/process/changes.rst).
>>>
>>>  scripts/kconfig/Makefile           |   15 ++++++++++++++-
>>>  scripts/kconfig/check-pkgconfig.sh |   12 ++++++++++++
>>>  2 files changed, 26 insertions(+), 1 deletion(-)
>>>
>>> --- lnx-416-rc3.orig/scripts/kconfig/Makefile
>>> +++ lnx-416-rc3/scripts/kconfig/Makefile
>>> @@ -160,6 +160,9 @@ help:
>>>         @echo  '  xenconfig       - Enable additional options for xen dom0 and guest kernel support'
>>>         @echo  '  tinyconfig      - Configure the tiniest possible kernel'
>>>
>>> +# pkg-config check
>>> +check-pkgconfig  := $(srctree)/$(src)/check-pkgconfig.sh
>>> +
>>>  # lxdialog stuff
>>>  check-lxdialog  := $(srctree)/$(src)/lxdialog/check-lxdialog.sh
>>>
>>> @@ -205,7 +208,17 @@ $(addprefix $(obj)/, mconf.o $(lxdialog)
>>>  $(obj)/dochecklxdialog:
>>>         $(Q)$(CONFIG_SHELL) $(check-lxdialog) -check $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTLOADLIBES_mconf)
>>>
>>> -always := dochecklxdialog
>>> +# Check that we have pkg-config (used by each of menu/n/g/xconfig)
>>> +PHONY += $(obj)/docheckpkgconfig
>>> +$(addprefix $(obj)/, mconf.o): $(obj)/docheckpkgconfig
>>> +$(addprefix $(obj)/, nconf.o): $(obj)/docheckpkgconfig
>>> +$(addprefix $(obj)/, gconf.o): $(obj)/docheckpkgconfig
>>> +$(addprefix $(obj)/, qconf.o): $(obj)/docheckpkgconfig
>>> +
>>> +$(obj)/docheckpkgconfig:
>>> +       $(Q)$(CONFIG_SHELL) $(check-pkgconfig)
>>> +
>>> +always := docheckpkgconfig dochecklxdialog
>>
>>
>> I did not test this patch, but does this check work as expected?
>>
>> Probably we want to run 'docheckpkgconfig'
>> before 'dochecklxdiag', '.tmp_gtkcheck', '.tmp_qtcheck', etc.
>> But, I do not see such dependencies.
>>
>>
>> Also, if we make 'pkg-config' mandatory,
>> should we entirely drop fall-back logics like follows?
>>
>> https://github.com/torvalds/linux/blob/v4.16-rc5/scripts/kconfig/lxdialog/check-lxdialog.sh#L10
>> https://github.com/torvalds/linux/blob/v4.16-rc5/scripts/kconfig/lxdialog/check-lxdialog.sh#L29
>> https://github.com/torvalds/linux/blob/v4.16-rc5/scripts/kconfig/Makefile#L230
>>
>>
>> What do you think?
>>
>
> Hi,
>
> I'm willing to keep patching/testing on this, but both pkg-config and depmod
> (for depmod, see: https://bugzilla.kernel.org/show_bug.cgi?id=198965)
> are basic requirements IMO, so just documenting their requirements is good
> enough to me, but might not be good enough for some users.
>
> Comments?

Sorry for late comments.

OK, I am fine with making pkg-config a requirement.
(and it should be documented)

But, I'd like to clean-up scripts/kconfig/Makefile first.
It is already cluttered, and hesitate to add new code based on that.
I posted the patches.

Could you send v3 after the cleaning work is done?

-- 
Best Regards
Masahiro Yamada