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Editorial Team
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Asked: 2026-06-01T08:36:24+00:00

I can build my project in Xcode(4.2) for debugging without issues, but when I

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I can build my project in Xcode(4.2) for debugging without issues, but when I want to build it for release (build for archiving) I get error:”Typedef redefinition with different types (unsigned int vs unsigned long)”.

Problematic code is:

#ifdef _LZMA_UINT32_IS_ULONG 
typedef long Int32; 
typedef unsigned long UInt32; 
#else 
typedef int Int32; 
typedef unsigned int UInt32; <--error on this line
#endif

You can see whole file on:
http://read.pudn.com/downloads166/sourcecode/zip/758136/C/Types.h__.htm

Previous definition is in MacTypes.h from CoreServices framework.

I have the same preprocessor macros for Debug and Release, and I am using Apple’s LLVM compiler 3.0. Same error happens when I try to build project for analyzing.

Any idea why this is happening?

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1 Answer

  1. Editorial Team

    In the case where you’re getting the error (when compiling 32 bit) you already have the equivalent of 

    typedef unsigned int UInt32; <--error on this line

    (hence the error) So you can delete the offending line.

    Apparently not all of your source includes / imports MacTypes.h, so to have it both ways, surround the offending line with #ifdefs like so:

    #ifndef __MACTYPES__
typedef unsigned int UInt32;
#endif

    Unfortunately this is not perfect; you need to be sure that if MacTypes.h is included, it happens before this. One way to ensure that is to do your system #imports before your local #imports.

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