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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	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.

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 m68k architecture.

       cmpdylib	       /NextLibrary/Frameworks/Foundation.framework/Foundation
       Foundation_proj/Foundation
       cmpdylib:   file:   Foundation_proj/Foundation	does	not    contain
       architecture: m68k
       cmpdylib:  new dynamic shared library: Foundation_proj/Foundation  does
       not contain architecture m68k

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).

NeXT Computer, Inc.		March 23, 1995			   CMPDYLIB(1)
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