OSXHorrors » History » Version 8

Chris Cannam, 2011-02-28 05:08 PM

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h1. OS/X version, hardware platform, and Qt version compatibility
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*Executive summary:* For a program like EasyHg that demands the widest possible compatibility, we currently want to hit the following targets:
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* 10.4 PPC 32-bit Carbon
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* 10.4 Intel 32-bit Carbon
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* 10.6 Intel 64-bit Cocoa
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To do this, we currently need at least two builds of Qt:
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* 10.4 gcc-4.0 Carbon PPC and i386
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* 10.5 or 10.6 gcc-4.2 Cocoa x86_64 (and optionally i386) -- this is what is shipped by default with Qt 4.7.1
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It is not possible to cover all platforms in a single build step, we always need to do at least two separate builds plus lipo.
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h2. OS/X 10.6
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h3. As target
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* By far the most common version as of Feb 2011
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* Not supported on PPC
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* Runs in 64-bit mode by default where possible
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* Is _not_ always 64-bit -- it is supported on 32-bit-only hardware such as Core Duo (first Intel Macs)
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h3. As build host
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* Builds 64-bit by default
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* Can be used to do 32-bit Intel and PPC builds
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h2. OS/X 10.5
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h3. As target
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* Not all that much more widely used than 10.4 -- if we were dropping 10.4, we probably might as well drop 10.5 as well
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* Last version supported for PPC platforms
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* Runs in 32-bit mode by default
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* Can build for it from 10.5, 10.6
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* Requires SDK @/Developer/SDKs/MacOSX10.5.SDK@
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* First version to support Objective-C 2.0
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* Qt Cocoa supported
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h3. As build host
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* Builds 32-bit by default
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* Can be used to do 64-bit builds
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h2. OS/X 10.4
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h3. As target
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* Oldest version still apparently in use as of Feb 2011: not very widespread (low single digit %age of Mac users), but at least two researchers here use it
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* Appears in PPC and i386 systems
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* Runs in 32-bit mode only
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* Can build for it from 10.4, 10.5, 10.6
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* Requires SDK @/Developer/SDKs/MacOSX10.4u.SDK@
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* Requires @-mmacosx-version-min=10.4@ on 10.5+
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* Requires gcc-4.0 to be requested explicitly on 10.6
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* Does not support Objective-C 2.0
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* Not a supported target for Qt's Cocoa builds, Qt Carbon needed
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h3. As build host
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* Does not support Objective-C 2.0
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* 10.4u SDK can be used to build 64-bit executables of simple C/C++ programs such as plugins, but not of GUIs or anything using Core frameworks