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Build Assumptions

Before you build your code as a universal binary, you must ensure that:

• Your application already builds for Mac OS X. Your application can use any of the Mac OS X development environments: Carbon, Cocoa, Java, or BSD UNIX.

• Your application uses the Mach-O executable format. Mach-O binaries are the only type of binary that run natively on an Intel-based Macintosh computer. If you are already using the Xcode compilers and linkers, your application is a Mach–O binary. Carbon applications based on the Code Fragment Manager Preferred Executable Format (PEF) must be changed to Mach-O.

• Your Xcode target is a native Xcode target. If it isn’t, in Xcode you can choose Project > Upgrade All Targets in Project to Native.

• Your code project is ported to GCC 4.0. Xcode uses GCC 4.0 for targeting Intel-based Macintosh computers. You may want to look at the document GCC Porting Guide to assess whether you need to make any changes to your code to allow it to compile using GCC 4.0.

• You installed the Mac OS X v10.4 universal SDK. The installer places the SDK in this location:

  /Developer/SDKs/MacOSX10.4u.sdk

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