One Quickie

Running a particular architecture (Tools->Hacks)
otest is kind of annoying that it tries to run the 64 bit version of your unit tests, especially if you don't have any. Typically you'd get an error like
2009-06-01 12:49:29.447 otest[70099:203] *** NSTask: Task create for path '/blah/blah/blah' failed: 8, "Exec format error". Terminating temporary process.
You can force otest to run a particular architecture with the arch command:
%  arch -arch i386 /Developer/Tools/otest build/Debug/Snoogle.octest

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Advanced Mac OS X Programming book