[Mesa-dev] [PATCH] Revert "configure: ask vdpau.pc for the default location of the vdpau drivers"

Christian K├Ânig deathsimple at vodafone.de
Tue Oct 7 06:36:14 PDT 2014

Am 07.10.2014 um 15:19 schrieb Ilia Mirkin:
> On Tue, Oct 7, 2014 at 9:13 AM, Christian König <deathsimple at vodafone.de> wrote:
>> Am 07.10.2014 um 15:07 schrieb Ilia Mirkin:
>>> On Tue, Oct 7, 2014 at 9:04 AM, Christian König <deathsimple at vodafone.de>
>>> wrote:
>>>> Am 07.10.2014 um 03:11 schrieb Ilia Mirkin:
>>>>> I'm under the assumption that OMX/etc don't do anything ridiculous. If
>>>>> they do, it's a bug just like this vdpau situation, and should be
>>>>> addressed as such. However addressing them should not preclude vdpau
>>>>> from being fixed.
>>>> Well, that was the whole point of the change. For OMX you don't have a
>>>> standardized sub directory where to put the loadable modules, e.g. it's
>>>> named libomxil-bellagio0 on Ubuntu and completely different on Fedora.
>>>> So what I did was just to use the $pluginsdir from libomxil-bellagio.pc
>>>> to
>>>> determine where to install the OMX files and ignored $prefix. But Emil
>>>> wanted all generated plugins to be installed consistently so he changed
>>>> VDPAU to the same behavior as OMX.
>>>> I'm perfectly fine with either approach, but it should just be
>>>> consistent.
>>> How about just failing the configure if you enable OMX (or anything
>>> else we don't know what to do with) but don't specify an install dir?
>> Would work for me as well, but doesn't sounds like the ideal solution.
>> Looking into the libomxil-bellagio.pc we have a whole chain of definitions
>> like:
>> prefix=/usr
>> exec_prefix=${prefix}
>> libdir=${exec_prefix}/lib
>> includedir=${prefix}/include
>> toolsdir=${exec_prefix}/bin
>> pluginsdir=${libdir}/libomxil-bellagio0
>> Isn't it somehow possible to let pkg-config assume a different $prefix while
>> evaluating the $pluginsdir variable (I honestly have no idea how pkg-config
>> works)?
>> That would solve the problem for OMX and make the behavior consistent again.
> Not sure about pkg-config either, but seems like defaulting it to
> ${libdir}/libomxil-bellagio0 is the right thing then (similarly to
> vdpau defaulting to ${libdir}/vdpau). That way you can set --libdir to
> /usr/lib/weirdo/place/that/debian/likes and everything will work out
> as expected. Right?

Nope, that won't work neither for Ubuntu nor Fedora.

Ubuntu usually sets $libdir to /usr/lib/x86_64-linux-gnu/ but the OMX 
dir is /usr/lib/libomxil-bellagio0/. And for Fedora the subdirectory is 
named differently than libomxil-bellagio0.

I've checked the pkg-config man page in the meantime, all we need to do 
is using "--define-variable=prefix=$prefix" for OMX.

At least on Ubuntu running "pkg-config --variable=pluginsdir 
--define-variable=prefix=/foo libomxil-bellagio" gives me 
"/foo/lib/libomxil-bellagio0" which is exactly what we wanted to know.

I'm pretty sure that's the right approach here,

>    -ilia

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