How is Xcode able to skirt GPL? [closed] - xcode

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Xcode is built over gcc, which is GPLed, and so any product built on gcc should also be released under the GPL.
How is Apple able to avoid releasing Xcode's source code?

Any product built on GCC's code needs to be GPLed. GCC is a separate program, and is replaceable with another compiler such as icc or clang, so the IDE itself isn't bound by the GPL.

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How to install previous version of xcode? [closed]

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In AppStore is available Xcode 4.4 but I need Xcode 4.2 and I can't find it at all. Help me please. Where can I find it and install?
Xcode is available from the Apple's developer support center. You'll need an account but they are free.

Are the kernels which are used in ubuntu and fedora or any Linux based OS same? [closed]

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The kernels which are used in various Linux based OS are same or they are different?
They are all based on the version found on kernel.org, but they usually add their own patches and backport fixes and hardware support.
For the most part the differences are not something to worry about.

Why does OSX Snow Leopard ship with GCC 4.2.1, and is it possible (advisable?) to upgrade? [closed]

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Maybe they have a good reason, but I'm struggling to understand why a new OS would still ship with such an old compiler that was originally released in 2007. Did Apple modify it heavily and so therefore it has some features that are required? Is it possible to just download 4.5.1 and use it with XCode?
4.2.1 was the last gcc which was covered by version 2 of the GPL. Coincidence? I doubt it.

Latex for Mac OS X [closed]

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Does anyone know of a latex distribution/front end they highly recommend for OS X?
If the front end had some features you recommend, what are they and why?
Thanks!
Use MacTeX and TeXworks (which comes with it). MacTeX is a Mac-specific wrapper around TeX Live including some useful extras.

taglib.framework for cocoa [closed]

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Where can I get the latest taglib.framework which I need to be used in cocoa?
taglib does not have an Objective-C specific API, but you could use the C API. There is is an OS X framework build listed on their homepage homepage.
Edit: thanks for pointing out the framework build listed at the bottom of the homepage.

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