With Xcode 4 and the iOS 6 SDK in order to make use of the classes in QuartzCore.framework you had to link against the QuartzCore.framework and #import <QuartzCore/QuartzCore.h>
. This was fine and it made sense. I was happy with my view of the world :)
In Xcode 5 with the iOS 7 SDK the QuartzCore headers seem to be getting imported automatically. Using CA classes raises no warnings or linker errors.
My question is this:
Given that these headers are obviously being imported from somewhere and the library is being linked, how do I trace the source of the import and the linked framework? This is more just for my curiosity and to understand more about this process than to solve a specific problem.
Additional Information:
Enable Modules (C and Objective-C)
and Link Frameworks Automatically
both to be "No" does not seem to require the #import of QuartzCore to compile.otool
shows nothing of the QuartzCore framework in its output:
$ otool -L Test
Test:
/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics (compatibility version 64.0.0, current version 600.0.0)
/System/Library/Frameworks/UIKit.framework/UIKit (compatibility version 1.0.0, current version 2903.2.0)
/System/Library/Frameworks/Foundation.framework/Foundation (compatibility version 300.0.0, current version 1047.20.0)
/usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 227.0.0)
/usr/lib/libSystem.dylib (compatibility version 1.0.0, current version 111.0.0)
Edited with a partial solution
<QuartzCore/QuartzCore.h>
which was not there in iOS 6. Mystery one solved, but the lack of linker errors is still curious.Looks like it is being linked by UIKit, possibly with LC_REEXPORT_DYLIB.
More information on this Twitter thread: https://twitter.com/daveverwer/status/390060215221354496
Running otool on UIKit.framework shows that it is linked.
$ otool -L UIKit
UIKit:
/System/Library/Frameworks/UIKit.framework/UIKit (compatibility version 1.0.0, current version 2380.17.0)
/System/Library/PrivateFrameworks/UIFoundation.framework/UIFoundation (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/CoreVideo.framework/CoreVideo (compatibility version 1.2.0, current version 1.8.0)
/System/Library/Frameworks/VideoToolbox.framework/VideoToolbox (compatibility version 1.0.0, current version 1.0.0)
/System/Library/PrivateFrameworks/MobileAsset.framework/MobileAsset (compatibility version 1.0.0, current version 1.0.0)
/System/Library/PrivateFrameworks/TelephonyUtilities.framework/TelephonyUtilities (compatibility version 1.0.0, current version 1.0.0)
/System/Library/PrivateFrameworks/WebBookmarks.framework/WebBookmarks (compatibility version 1.0.0, current version 1.0.0)
/System/Library/PrivateFrameworks/BackBoardServices.framework/BackBoardServices (compatibility version 1.0.0, current version 1.0.0)
/System/Library/PrivateFrameworks/XPCObjects.framework/XPCObjects (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libicucore.A.dylib (compatibility version 1.0.0, current version 49.1.0)
/System/Library/Frameworks/CoreImage.framework/CoreImage (compatibility version 1.0.0, current version 2.0.0)
/System/Library/Frameworks/Security.framework/Security (compatibility version 1.0.0, current version 1.0.0)
/System/Library/PrivateFrameworks/DictionaryServices.framework/DictionaryServices (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/Foundation.framework/Foundation (compatibility version 300.0.0, current version 993.0.0)
/System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices (compatibility version 1.0.0, current version 14.0.0)
/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics (compatibility version 64.0.0, current version 600.0.0)
/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation (compatibility version 150.0.0, current version 793.0.0)
/usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 227.0.0)
/System/Library/Frameworks/ImageIO.framework/ImageIO (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/QuartzCore.framework/QuartzCore (compatibility version 1.2.0, current version 1.8.0)
/System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices (compatibility version 1.0.0, current version 1.0.0)
/System/Library/PrivateFrameworks/AppSupport.framework/AppSupport (compatibility version 1.0.0, current version 29.0.0)
/System/Library/Frameworks/CoreText.framework/CoreText (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices (compatibility version 1.0.0, current version 40.0.0)
/usr/lib/libsqlite3.dylib (compatibility version 9.0.0, current version 9.6.0)
/System/Library/PrivateFrameworks/WebKit.framework/WebKit (compatibility version 1.0.0, current version 536.26.0)
/System/Library/PrivateFrameworks/WebCore.framework/WebCore (compatibility version 1.0.0, current version 536.26.0)
/System/Library/PrivateFrameworks/ProofReader.framework/ProofReader (compatibility version 1.0.0, current version 180.0.0)
/System/Library/Frameworks/CFNetwork.framework/CFNetwork (compatibility version 1.0.0, current version 609.1.4)
/usr/lib/libAccessibility.dylib (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/Accelerate.framework/Accelerate (compatibility version 1.0.0, current version 4.0.0)
/System/Library/PrivateFrameworks/PrintKit.framework/PrintKit (compatibility version 1.0.0, current version 109.2.0)
/usr/lib/libMobileGestalt.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 56.0.0)
/usr/lib/libSystem.dylib (compatibility version 1.0.0, current version 125.0.0)
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