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CMPDYLIB(1)									      CMPDYLIB(1)

       cmpdylib - compare two dynamic shared libraries for compatibility

       cmpdylib oldLibrary newLibrary

       cmpdylib  compares  two versions of a dynamic shared library to see if they are compatible
       with each other. If the two versions are incompatible, the reason is  printed  to  stdout,
       and  the  exit status is nonzero. If they are compatible, nothing is printed, and the exit
       status is zero.

       To see if the two versions are compatible, cmpdylib first  verifies  that  newLibrary  was
       built  for  all of the architectures that oldLibrary was built for. If so, for each archi-
       tecture, it checks to see if the global symbols defined in oldLibrary are still defined in
       newLibrary.   It  then  looks  for new symbols, symbols defined in newLibrary that are not
       defined in oldLibrary.  If it finds new symbols, it  compares  the  compatibility  version
       numbers	of  the  two  libraries.   If  the  compatibility version number of newLibrary is
       greater than oldLibrary, the libraries are still compatible.  If the compatibility version
       number is the same or less, the libraries are incompatible.

	      The older version of the library.

	      The newer version of the library.

       This  example  shows the result of performing cmpdylib on two incompatible versions of the
       Foundation library. As stated, the versions are incompatible because the newer version was
       not built for the ppc architecture.

       cmpdylib  /System/Library/Frameworks/Foundation.framework/Foundation Foundation_proj/Foun-
       cmpdylib: file: Foundation_proj/Foundation does not contain architecture: ppc
       cmpdylib: new dynamic shared library: Foundation_proj/Foundation  does not contain  archi-
       tecture ppc

       The  exit  status  is  zero if the library versions are compatible and nonzero if they are

       There are lots of other things that could be checked for that are not (such as the  Objec-
       tive C API).

Apple Computer, Inc.			 November 3, 1997			      CMPDYLIB(1)
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