[FFmpeg-devel] [PATCH] Use pkgconfig for dirac libs

[Diego 'Flameeyes' Pettenò]

M?ns Rullg?rd <mans at mansr.com> writes:

>>> Use of pkgconfig is discouraged; it creates more problems than it
>>> solves, especially when cross-compiling.
>>
>> How so?
>
> It tries to link with /usr/lib/libfoo.so instead of
> /usr/arm-unknown-linux-gnueabi/usr/lib/libfoo.so.  I'm sure you
> understand why that doesn't work too well.

Are you using the command as "pkg-config" ? pkg-config is a tool that,
akin to gcc, ld and others, have a CTARGET as well as a CHOST; this
means that you should have an arm-unknown-linux-gnueabi-pkg-config
command that looks in /usr/arm-unknown-linux-gnueabi/usr/lib/pkgconfig
rather than in /usr/lib/pkgconfig .

I'm sure of what I say because I _did_ engineer a crosscompiling
toolchain for work two years ago and I had pkg-config working perfectly
fine that way...

I just checked the configure and it uses pkg-config directly; instead it
should use "${cross_prefix}pkg-config", and then it wouldn't "lie" to you
anymore. Yes I know it's no the most intuitive of things, but if you
think a bit about how crosscompiling is done it does fit in.

I know it's like asking a poisoned person to look up a digitalis flower,
but if you check pkg.m4 or the output of an autoconf ./configure that
uses pkg-config, it looks for $host-pkg-config before checking for
pkg-config itself.

-- 
Diego "Flameeyes" Petten?
http://blog.flameeyes.eu/
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