pkgconfiguration lost

[thedayofcondor]

Hi, it am not sure if this is done on purpose, but it looks like the Dockerfile sets pkgconfig correctly, but then "forgets" to copy the various .pc files from /opt/ffmpeg.libs/pkgconfig/ to the main image (if I understand correctly it gets a list of dependencies running ldd and just copies those).

Would it be possible to preserve the .pc files?

[jrottenberg]

ACK, it's not trivial as we move the content around so the copy actually change the location, so the content of those files will need to be updated accordingly (sed)

[thedayofcondor]

I have the same problem with other packages I build - turns out that by default pkg-config (at least on recent versions) ignores the prefix variable and replaces it with the parent folder of the .pc location (ie /usr/local/lib if the .pc is read from /usr/local/lib/pkgconfig), as building in one folder and then moving to a different one is quite a common workflow - so this is generally not an issue.

However, at least in my distribution this default has been overridden (there's a command line option to restore this behaviour) so probably using a sed filter as an enhanced copy is the safest option.

The modification to each .pc file would be always the same, override prefix with /usr/local/lib - I am in the process of updating my own .pc, give me a couple of days and I will be able to share some code

[thedayofcondor]

As promised, this is what I am using now:

OLDPREFIX=/opt/ffmpeg
NEWPREFIX=/usr/local
find ${OLDPREFIX}/lib/ -path "*/pkgconfig/*.pc" | while read PCFILE; do
    echo "Updating ${OLDPREFIX} to ${NEWPREFIX} in ${PCFILE}"
    sed -i "s|^prefix=${OLDPREFIX}$|prefix=${NEWPREFIX}|" ${PCFILE}
done

Note this patches the .pc file in place, ready to be copied - a slightly more elegant solution would be to change the sed line to also perform the copy to /usr/local/lib/pkgconfig/