移植 - 5. 为 10.3 做准备

5.1 Perl

In OS X 10.2, /usr/bin/perl was perl 5.6.0 and the architecture string was "darwin". In OS X 10.3, /usr/bin/perl was upgraded to perl 5.8.1 and the architecture string was changed to "darwin-thread-multi-2level". These changes probably do not affect ordinary uses of the perl executable for package creation since each perl executable knows where to find its own modules. Maintainers of perl-module ("-pm") packages who follow the current Perl Modules packaging policy and are careful to follow the CompileScript and InstallScript documentation will already have things set up correctly.

5.2 New symbol definitions

Starting in Mac OS X 10.3, there is now always a complete definition for the socklen_t type. To get this typedef defined, you may need to add to your program:

#include <sys/types.h>
#include <sys/socket.h>

5.3 New builtin system libraries

Mac OS X 10.3 includes several libraries that were not in previous system releases, and so were provided as fink packages:

Field	Value
libpoll	The files `/usr/lib/libpoll.dylib` and `/usr/include/poll.h` are now included, however the OS X-supplied implementation of this library is not complete. If it is sufficient for your purposes, you can remove dependencies on the Fink "libpoll" and "libpoll-shlibs" packages. The library code is actually incorporated into libSystem, which is automatically linked. That means that `-lpoll` is not necessary if you wish to use the OS X implementation. Be aware that OS X supplies a `libpoll.dylib`, so `-lpoll` may give different results depending on whether you have the Fink "libpoll" package installed or not.
libdl	The files `/usr/lib/libdl.dylib` and `/usr/include/dlfcn.h` are now included, so you should not need dependencies on the Fink "dlcompat", "dlcompat-dev", and "dlcompat-shlibs" packages. The library code is actually incorportated into libSystem, which is automatically linked. That means that `-ldl` is not necessary (but has no effect if used).
GNU getopt	This library, including the `getopt_long()` function, has been incorportated into libSystem and `/usr/include/getopt.h`, so you may not need to use the Fink "libgnugetopt" and "libgnugetopt-shlibs" packages. Because libSystem is automatically linked and `/usr/include` is automatically searched for headers, you could remove any `-lgnugetopt` and `-I/opt/sw/include/gnugetopt` flags that were manually added in order to access Fink's "libgnugetopt".

When migrating a package to OS X 10.3, try to remove these deprecated dependencies, as those packages may be removed from these newer package trees in the future. This means you will need a separate package description file for each tree. As always, the Revision must be increased when making changes to a package. In this manner, a user who upgrades from OS X 10.2 to 10.3 will see 10.3-specific packages as "newer" than his existing 10.2 ones. By convention, the Revision should be increased by 10 when changes are made for migration to a higher tree inn order to leave space for the lower-tree package to be updated in the future.

When testing a migrated package, make sure to uninstall the packages whose BuildDepends you removed. Otherwise the compiler may still link the Fink-supplied libraries.