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Heads up: Runtime selection flag in clang

From: David Chisnall
Subject: Heads up: Runtime selection flag in clang
Date: Wed, 4 Jul 2012 13:17:45 +0100

Hi Everyone,

Clang now has an option for explicitly specifying the Objective-C runtime to 
use: -fobjc-runtime=.  This currently supports:

macosx (The 'modern' OS X runtime with the non-fragile ABI)
macosx-fragile (The 'legacy' OS X runtime with the fragile ABI)
ios (The iOS runtime, which is more or less the same as the OS X one)
gnustep (libobjc2 from GNUstep svn)
gcc (The runtime shipped with GCC)

These largely supersede the old combination of runtime target flags 
(-fobjc-nonfragile-abi, -fno-objc-legacy-dispatch and so on).  These are still 
supported, but they are mapped to the new runtimes now.  

Please test this!


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