On 27 Aug 2009, at 13:04, Marco van de Voort wrote:
OS X and FreeBSD have basically the same problem, however has some
mitigating factors (they change mostly only with major versions, and
have
the ability to run older binaries using resp COMPAT and SDK system)
The SDK's on Mac OS X are only for compiling, not for running. The way
it's solved on Mac OS X is by almost never breaking backwards
compatibility at the library level (they've haven't done it yet for
libc since the launch of OS X 8 years ago, although that's obviously
not that long a time ago), and if they do they include both the old
and the new library or framework.
Both libraries and frameworks have internal versioning information
that enables automatically checking whether or not an application and
a library are compatible. Standard library linking happens similar to
on other Unix systems, with the filename being used to select the
appropriate version. In case of frameworks, the framework bundle
itself can contain multiple versions and the correct one is
automatically selected when the application is launched.
Jonas
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