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Postings from July 2003
Fwd: Re: Perl for Panther
From:
Rich Morin
Date:
July 1, 2003 10:09
Subject:
Fwd: Re: Perl for Panther
Message ID:
p05200f2fbb276eee502b@[192.168.254.205]
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>Cc: Omni List <macosx-talk@omnigroup.com>
>From: Edward Moy <emoy@apple.com>
>Subject: Re: Perl for Panther
>To: John Adams <jadams01@sprynet.com>
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>X-Original-Date: Wed, 25 Jun 2003 14:21:49 -0700
>Date: Wed, 25 Jun 2003 14:21:49 -0700
>
>On Tuesday, June 24, 2003, at 5:41PM, John Adams wrote:
>
>Has anyone heard what version of Perl we should expect with
>Panther--5.6.0 again, 5.6.1, 5.8.0, 5.8.1 (imminent)?
>
>For the record, there is a release note included with the WWDC
>version of Panther, which I include here.
>
>Edward Moy
>Apple
>--------------------------------------------------------
>PATH Documentation >Release Notes
>
>
>Mac OS X 10.3.x Developer Release Notes:
>Perl 5.8.1 Release Notes
>
>Mac OS X 10.3 will ship with version 5.8.1 of Perl, which will have
>many new and improved features.
>
>The highlights of the 5.8 series include:
>
>* Better Unicode support
>* New IO Implementation
>* New Thread Implementation
>* Better Numeric Accuracy
>* Safe Signals
>* Many New Modules
>
>However, for Perl extensions (XS modules), the 5.8 series is not
>binary-compatible with earlier releases on Perl, including the 5.6
>version that shipped on previous releases of Mac OS X. This means
>that developers will have to recompile their Perl extensions to use
>them in Mac OS X 10.3.
>
>With the 5.8.1 version, the standard distribution of Perl for Mac OS
>X makes the following changes:
>
>* Versioning - the Perl release will be installed in a 5.8.1
>sub-directory of /System/Library/Perl and /Library/Perl . This
>allows multiple versions of Perl to be run on a user's system
>without conflict.
>* Two-level namespace support - Perl extensions will be compiled
>automatically with two-level namespace support, greatly alleviating
>the problem of duplicate symbols.
>* The Mac OS X version of Perl will also have the new ithreads
>support turned on, so Perl programs can be multithreaded.
>
>These changes in 5.8.1 will make it binary incompatible with not
>only previous versions of Perl, but even with the same version not
>built with this same set of features. For example, the ithread
>support alone changes the internal workings of Perl so that
>extensions are incompatible.
>
>To ameliorate these binary incompatibilities, the 5.8 series
>implements different names for the architecture-dependent directory
>depending on the compiled features. So instead of the familiar
>darwin directory, the new architecture-dependent directory for the
>Mac OS X release will be darwin-thread-multi-2level .
>
>The breaking of binary compatibility for 5.8.1 was unavoidable, but
>once made, Apple does not intend to change this any further in the
>10.3 timeframe. Developers with prerelease versions of 10.3 may
>begin to recompile their extensions with assurance that the binary
>compatibility will not change when 10.3 is shipped.
>
>One final word about compatibility. The two-level namespace support
>uses a feature only available in 10.3. That means Perl extensions
>built under 10.3 can never be made to run under previous versions of
>Mac OS X. Perl extensions that need to run under both 10.3 and
>previous releases will need to have separate versions.
>
>Copyright © 2003 Apple Computer, Inc.
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Fwd: Re: Perl for Panther
by Rich Morin