Question

I just upgraded to Snow Leopard, including installing the new XCode, re-compiled Ruby 1.8 and MySQL. My Rails app is running fine in the updated environment, except for some image processing features, which depend on ImageScience/FreeImage.

I upgraded MacPorts to 1.8, removed all previously installed ports and reinstalled them in 1.8, which I assume would have installed a 64-bit versions of the ports, including FreeImage. I also re-installed the image_science and RubyInline as 64-bit gems using:

sudo env ARCHFLAGS=”-arch x86_64″ gem install RubyInline image_science

Now when I run my app on pages that require image processing I get this error in my log:

Problems loading ImageScienceProcessor: dlopen(/myappname/config/initializers/../tmp/.ruby_inline/Inline_ImageScience_cdab.bundle, 9): no suitable image found. Did find:
/myappname/config/initializers/../tmp/.ruby_inline/Inline_ImageScience_cdab.bundle: mach-o, but wrong architecture – /myappname/config/initializers/../tmp/.ruby_inline/Inline_ImageScience_cdab.bundle

Can someone help me out as to what this error is telling me?

Answer 1

It reports that it tried to execute some native code, which was in the right executable format, but for the wrong architecture. This probably means that there is either still a mismatch between the gem version and the running kernel, or that some temporary code which was created when you still had your old operating system installed is still there. Two possible solutions might be:

1. Make a backup of your application, find the offending “.ruby_inline” directory and delete it, then try again.
2. Find out where the “RubyInline” and “image_science” gems are installed (e.g. gem list -d image_science) and check that their native parts (usually those within gems//lib or something similar, those in “bin” or those with a “.so” extension) match your kernel. You can use the “file” tool to examine whether a file is a 32 or 64 bit executable (simply call file filename).