[Buildroot] libcec needs to be patched to provide a correct libcec.pc
Yann E. MORIN
yann.morin.1998 at free.fr
Sat Jun 14 10:13:35 UTC 2014
Bernd, All,
On 2014-06-14 05:52 +0200, Bernd Kuhls spake thusly:
> "Yann E. MORIN" <yann.morin.1998 at free.fr> wrote in
> news:20140613212754.GB16169 at free.fr:
> > Can you elaborate a bit on why and how we should patch libcec.pc,
> > please?
>
> when libcec finds libudev during configure
> output/staging/usr/lib/pkgconfig/libcec.pc will contain
>
> Requires: udev
>
> When xbmc configure searches for libcec it finds this requirement and tries
> to find udev.pc, which fails when only libudev is present:
>
> checking for UDEV... yes
> configure: == libusb disabled. ==
> checking for CEC... no
> configure: error: == libcec disabled. CEC adapter support will not be
> available. ==
>
> xbmc/config.log shows:
>
> configure:29084: $PKG_CONFIG --exists --print-errors "libcec >= 2.1.0"
> Package udev was not found in the pkg-config search path.
> Perhaps you should add the directory containing `udev.pc'
> to the PKG_CONFIG_PATH environment variable
> No package 'udev' found
>
> So we need to patch libcec/configure.ac in line 237 from
>
> REQUIRES="$REQUIRES udev"
>
> to
>
> REQUIRES="$REQUIRES libudev"
>
> to make xbmc happy.
Ah! OK, I get it now! Thanks for the thorough explanations. :-)
And indeed, my libudev-only small test-case obviously demonstrates the
above:
$ ls -l staging/usr/lib/pkgconfig/
total 8
-rw-r--r-- 1 ymorin ymorin 278 Jun 13 22:58 libcec.pc
-> -rw-r--r-- 1 ymorin ymorin 509 Jun 13 22:49 libudev.pc
$ cat staging/usr/lib/pkgconfig/libcec.pc
prefix=/usr
exec_prefix=/usr
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libcec
Description: Pulse-Eight CEC adapter library
URL: http://www.pulse-eight.com/
Version: 2:1:0
-> Requires: udev
Libs: -L${libdir} -lcec
Cflags: -I${includedir} -I${includedir}/libcec
So, in case we only provide a libudev, can't we just simlink udev.pc to
libudev.pc (or the other way around) as we won't patch every and all
packages in the wild?
I'll do the symlinking unless there is a good reason not to.
Regards,
Yann E. MORIN.
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