FindImageMagick.cmake does not properly detect required macro definitions
This was reported in Debian here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776832
the ImageMagick module appears to be incompatible with imagemagick current version in jessie.
When compiling, one gets:
/usr/include/ImageMagick-6/magick/magick-config.h:29:3: warning: #warning "you should set MAGICKCORE_QUANTUM_DEPTH to sensible default set it to configure time default" [-Wcpp]
# warning "you should set MAGICKCORE_QUANTUM_DEPTH to sensible default set it to configure time default"
^
/usr/include/ImageMagick-6/magick/magick-config.h:30:3: warning: #warning "this is an obsolete behavior please fix your makefile" [-Wcpp]
# warning "this is an obsolete behavior please fix your makefile"
^
/usr/include/ImageMagick-6/magick/magick-config.h:52:3: warning: #warning "you should set MAGICKCORE_HDRI_ENABLE to sensible default set it to configure time default" [-Wcpp]
# warning "you should set MAGICKCORE_HDRI_ENABLE to sensible default set it to configure time default"
^
/usr/include/ImageMagick-6/magick/magick-config.h:53:3: warning: #warning "this is an obsolete behavior please fix yours makefile" [-Wcpp]
# warning "this is an obsolete behavior please fix yours makefile"
^
Instead the cmake / imagemagick module should use the pkg-config internally or update it's own implementation to follow:
$ pkg-config --cflags ImageMagick
-fopenmp -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16 -I/usr/include/x86_64-linux-gnu//ImageMagick-6 -I/usr/include/ImageMagick-6