[oe] New kmod {libdir} breaks udev 182 build

[Thilo Fromm]

Hello Khem,

>> I've got an issue with
>> openembedded-core/meta/recipes-kernel/kmod/kmod_git.bb, with the way
>> {libdir} is set in line 19:
>>
>> libdir = "${base_libdir}"
>>
>> "git blame" claims this was added by Khem Raj on 2012-05-08. This line
>> causes libkmod to put its pkgconfig ".pc" file in the staging area at
>> "/lib/pkgconfig/libkmod.pc". This is sad because other recipes would
>> only look at /usr/lib/pkgconfig/ and /usr/share/pkgconfig.
>>
>> Take meta-openembedded/meta-oe/recipes-core/udev/udev_182.bb, for
>> example. The build predictably fails with
>>
>> checking for KMOD... no
>> configure: error: Package requirements (libkmod >= 5) were not met:
>>
>> No package 'libkmod' found
>>
>>
>> So what's the right thing do do here? Use a different package install
>> path for libkmod, or point udev to /lib/pkgconfig by extending its
>> PKG_CONFIG_PATH correspondingly?
>
> One solution is to fix kmod to install pc files in /usr/lib with right paths
> to access libkmod
>
> second solution is to look for pc files in ${base_libdir} while building udev
> can you try this option.

Yes, I was trying to state these two possible resolutions in my first
mail. I already tried adding

PKG_CONFIG_PATH =
"${PKG_CONFIG_DIR}:${STAGING_DATADIR}/pkgconfig:${PKG_CONFIG_SYSROOT_DIR}/${base_libdir}/pkgconfig/"

to udev-182 and systemd (which is also affected) recipes. It works
around the bug. Still, I think kmod is publishing its .pc files in the
wrong directory.

Regards,
Thilo

-- 
Dipl.-Ing (FH) Thilo Fromm, MSc., Embedded Systems Architect
DResearch Fahrzeugelektronik GmbH
Otto-Schmirgal-Str. 3, D-10319 Berlin, Germany
Tel: +49 (30) 515 932 228   mailto:fromm at dresearch-fe.de
Fax: +49 (30) 515 932 77    http://www.dresearch.de
Amtsgericht: Berlin Charlottenburg, HRB 130120 B
Ust.-IDNr. DE273952058
Geschäftsführer: Dr. M. Weber, W. Mögle