.TH CMPDYLIB 1 "November 3, 1997" "Apple Computer, Inc." .SH
NAME cmpdylib \- compare two dynamic shared libraries for
compatibility .SH SYNOPSIS .B cmpdylib .I oldLibrary .I
newLibrary .SH DESCRIPTION .B 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. .PP
To see if the two versions are compatible, .B cmpdylib first
verifies that .I newLibrary was built for all of the
architectures that .I oldLibrary was built for. If so, for each
architecture, it checks to see if the global symbols defined in
.I oldLibrary are still defined in .I newLibrary. It then looks
for new symbols, symbols defined in .I newLibrary that are not
defined in .I oldLibrary. If it finds new symbols, it compares
the compatibility version numbers of the two libraries. If the
compatibility version number of .I new