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CMPDYLIB(1)                                                                                      CMPDYLIB(1)



NAME
       cmpdylib - compare two dynamic shared libraries for compatibility

SYNOPSIS
       cmpdylib oldLibrary newLibrary

DESCRIPTION
       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 architecture, it checks to see if
       the global symbols defined in oldLibrary are still defined in newLibrary.  It then looks for new sym-bols, symbols,
       bols, 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.

OPTIONS
       oldLibrary
              The older version of the library.

       newLibrary
              The newer version of the library.

EXAMPLES
       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/Foundation
       cmpdylib: file: Foundation_proj/Foundation does not contain architecture: ppc
       cmpdylib: new dynamic shared library: Foundation_proj/Foundation  does not contain architecture ppc

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

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




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

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