June 19, 2009

Detecting native ruby gems with the wrong archetecture

Having recently upgraded to Snow Leopard I have found myself going between my ruby projects and running the tests only to find that the gems I have installed are not 64 bit binaries. Since I am running the ruby that shipped with 10.6 I am running as 64 bit and I would get some nasty wrong archetecture errors. Well I wanted to find a way to go figure out all the gems that did not have x86_64 binary libraries.

Here is the ruby script I came up with:

Gem::all_load_paths.each do |p| 
  Dir["#{p}/../ext/*.bundle"].each do |f|
    s = `file #{f}`
    if (!s.include? "for architecture x86_64")
      puts s

Nice thing about this is it uses all_load_paths to find where the gems are located, so if you have them installed im multiple places (like /Library/Ruby/Gems/ and ~/.gems) it should find them.

Now if you find gems that are not supported it is normally pretty easy to fix. Here is what I did to fix nokogiri:

# Copy the gem to temp
cp -r /Library/Ruby/Gems/1.8/gems/nokogiri-1.3.1/ /tmp/nokogiri
cd /tmp/ext/nokogiri
# Add our archetecture 
sed "s/i386/i386 \-arch x86_64/" Makefile > Makefile
make clean
# Replace the old binary
sudo cp nokogiri.bundle /Library/Ruby/Gems/1.8/gems/nokogiri-1.3.1/lib/nokogiri/nokogiri.bundle
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