[Octave-bug-tracker] [bug #49653] Build failure with ImageMagick

[Markus Mützel]

Follow-up Comment #18, bug #49653 (project octave):

Trying to configure with the ImageMagick libraries using our "--with-magick="
configure flag didn't work for me.

Currently we are adding "++" to the end of the package name that we query from
pkg-config. That doesn't work with the naming convention of that package on
Ubuntu 21.10 (and possibly other distributions) where it is named e.g.
"Magick++-6.Q16HDRI" (other variants can also be installed).

Additionally, we are currently ignoring all pre-processor flags but "-I" from
the Magick++ libraries. There is a comment at the configure check that says
that some extra flags might break Octave compilation. That comment is from
more than 10 years ago:
http://hg.savannah.gnu.org/hgweb/octave/rev/55ecaefb7d0f
Maybe that's no longer an issue?

With the attached patch, I can configure with:

../configure CPPFLAGS="-I/usr/include/hdf5/serial -I/usr/include/suitesparse"
LDFLAGS="-L/usr/lib/$(dpkg-architecture -qDEB_HOST_MULTIARCH)/hdf5/serial"
--prefix=${HOME}/usr --with-magick=Magick++-6.Q16HDRI


Octave compiles and links correctly for me.

The tests involving alpha channels and greyscale images in `imwrite` are
failing. But that is probably a different issue.

(file #52257)
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Additional Item Attachment:

File name: bug49653-magick-pkg-config.patch Size:2 KB
   
<https://file.savannah.gnu.org/file/bug49653-magick-pkg-config.patch?file_id=52257>



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