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Posting this just so if someone else runs into the problem they’ll hopefully find this and find the solution.

I like to use OCUnit:http://developer.apple.com/documentation/DeveloperTools/Conceptual/UnitTesting/Articles/CreatingTests.html for unit testing my Objective-C code. PowerCard has unit tests using this, and I was starting a new project, and set it up, and wrote some unit tests. I started to see the following error:

This persisted even with the simplest of test cases like:

Seemed to have something to do with the STAssertEqualObjects macro.

Anyway, after much digging and trying to figure out what the problem was. I discovered it was because I had enabled the “C99” setting in the C Language Dialect setting of my target instead of using “GNU99”. I have wondered for a long time what the difference was. I guess now I know I should just use GNU99 for everything.