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copied!<p>There is a another way as gcc-4.2 still supports armv6, which won't require you to close Xcode 4.5 an open a previous version (for compilation, but not for running app on a 4.2 device) :</p> <ul> <li>Add armv6 to both valid archs and archs :</li> </ul> <p>Archs : $(ARCHS_STANDARD_32_BIT) armv6</p> <p>Valid Architectures : armv6 armv7 armv7s</p> <ul> <li>Vim (or TextEdit) your project.pbxproj file to replace IPHONEOS_DEPLOYMENT_TARGET to 4.0 - 4.1 - 4.2 as you need, Xcode 4.5 won't let you get below 4.3.</li> </ul> <p>Then, if you build your project, you will see warnings :</p> <pre> warning: no rule to process file '$(PROJECT_DIR)/App/AppDelegate.m' of type sourcecode.c.objc for architecture armv6 warning: no rule to process file '$(PROJECT_DIR)/App/SomeFile.c' of type sourcecode.c.c for architecture armv6 </pre> <ul> <li>Add a <code>Build Rule</code> for source files with names matching : <code>*.[mc]</code> that will use <code>LLVM GCC 4.2</code></li> </ul> <p>It works for static libraries, but not for apps :</p> <pre> ld: file is universal (4 slices) but does not contain a(n) armv6 slice: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o for architecture armv6 </pre> <ul> <li>For making it works for apps, we need to add the armv6 slice to this object file (which comes with the 5.1 SDK) :</li> </ul> <pre> lipo /path/to-4.4/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk/usr/lib/crt1.3.1.o -extract armv6 -output /tmp/crt1.3.1-armv6.o lipo /Applications/Xcode.app/Contents//Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o /tmp/crt1.3.1-armv6.o -create -output /tmp/crt1.3.1-armv677s.o mv /Applications/Xcode.app/Contents//Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o /Applications/Xcode.app/Contents//Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o.bkp mv /tmp/crt1.3.1-armv677s.o /Applications/Xcode.app/Contents//Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/crt1.3.1.o </pre> <p>Compile your project and check that your app contains all archs :</p> <pre> $ file DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app/TestApp DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app/TestApp: Mach-O universal binary with 3 architectures DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app/TestApp (for architecture armv6): Mach-O executable arm DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app/TestApp (for architecture armv7): Mach-O executable arm DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app/TestApp (for architecture cputype (12) cpusubtype (11)): Mach-O executable arm </pre> <p>Note that the dSYM file also contains all archs (useful for crash report symbolification) :</p> <pre> $ file DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app.dSYM/Contents/Resources/DWARF/TestApp DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app.dSYM/Contents/Resources/DWARF/TestApp: Mach-O universal binary with 3 architectures DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app.dSYM/Contents/Resources/DWARF/TestApp (for architecture armv6): Mach-O dSYM companion file arm DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app.dSYM/Contents/Resources/DWARF/TestApp (for architecture armv7): Mach-O dSYM companion file arm DerivedData/TestApp/Build/Products/Debug-iphoneos/TestApp.app.dSYM/Contents/Resources/DWARF/TestApp (for architecture cputype (12) cpusubtype (11)): Mach-O dSYM companion file arm </pre> <p>I've sucessfully installed and launched the app on an iOS 4.2 2gen iPod touch by opening xcode 4.4.1, then <code>Product</code> -> <code>Run without building</code>.</p> <ul> <li>When you <strong>Archive</strong> your product, you may experience again the Apple Mach-O Linker error, this time involving other files, such as <code>libarclite_iphoneos.a</code> or <code>libclang_rt.ios.a</code>:</li> </ul> <pre> ld: file is universal (2 slices) but does not contain a(n) armv6 slice: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc/libarclite_iphoneos.a for architecture armv6 </pre> <pre> ld: file is universal (2 slices) but does not contain a(n) armv6 slice: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/4.1/libclang_rt.ios.a for architecture armv6 </pre> <p>The procedure used for crt1.3.1.o applies to these files too, and will fix the error allowing Xcode to successfully archive your project: you can use the path printed by <em>ld</em> to find the file and join the armv6 slice with <em>lipo</em>; just keep in mind that libclang_rt.ios.a in the previous versions of Xcode isn't located in <code>Xcode.app/[...]/usr/lib/clang/4.1</code> but in <code>Xcode.app/[...]/usr/lib/clang/4.0</code>.</p> <p>I've successfully archived the file, deployed it with an ad-hoc distribution profile, and tested on iPhone 3G (4.2.1) and iPhone 3GS (6.0).</p> <ul> <li>Last issue : we can't launch app. In the <code>Organizer</code>, there is the message : <strong>Devices of type “iPhone 3G” are not supported by this version of Xcode.</strong></li> </ul> <p>But an <code>ls</code> in the <code>DeviceSupport</code> shows :</p> <pre> ls /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/ 4.2 4.3 5.0 5.1 6.0 (10A403) </pre> <p>With no diffs in the 4.2 directory from Xcode 4.4.1.</p> <p>The question is now : how Xcode detect is device is supported or not ?</p> <p>Opening <code>/Applications/Xcode.app/Contents/Developer//Platforms/iPhoneOS.platform/Developer//Library/PrivateFrameworks/DTDeviceKitBase.framework/DTDeviceKitBase</code> with <code>Hex Fiend</code> (or another hex editor), and replacing ascii <code>4.3</code> with <code>4.2</code> make the error message disappear, and app installed on the device are listed (but device bullet in the device list is still red).</p> <p>Then we need to edit <code>/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/PrivateFrameworks//DTDeviceKit.framework/Versions/Current/DTDeviceKit</code> and replace :</p> <p><code>Expired.deviceArchitecture.iPhone1,1.iPhone1,2.iPod1,1.iPod2,1.iPod2,2.armv6</code> </p> <p>to :</p> <p><code>Expired.deviceArchitecture.iPhone0,1.iPhone0,2.iPod0,1.iPod0,1.iPod0,2.armv5</code></p> <p>Then we have an orange bullet in the Organizer (Xcode 4.5.1) :</p> <pre> The version of iOS on “iPhone” is too old for use with this version of the iOS SDK. Please restore the device to a version of the OS listed below. OS Installed on iPhone 4.2.1 (8C148) Xcode Supported iOS Versions 6.0 (10A403) 5.1 5.0 4.3 </pre> <p>The question is now : where Xcode Supported iOS Versions are defined ?</p> <p>As there is a <code>4.2</code> directory in <code>/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/</code>, it should already be supported...</p> <p>Tried to copy <code>iPhoneOS4.2.sdk</code> from Xcode 4.4.1 to <code>/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/</code>, but it don't make device supported.</p> <p>So haven't found how to add 4.2 device support in Xcode 4.5. Any ideas ?</p> <p>Conclusion : compiling for armv6/7/7s within Xcode 4.5 is possible. But it is not possible to start an app on a 4.2 armv6 device without starting Xcode 4.4.</p> <p><strong>Big update : it works with Xcode 4.5.2 !</strong></p> <p>Now the bullet is green in Xcode 4.5.2 :-) The device appear in the drop down list near the Run button. But when trying to run the app, got the message : </p> <pre> Xcode cannot run using the selected device. Choose a destination with a supported architecture in order to run on this device. </pre> <p>Simply add armv6 to the valid architectures :-)</p> <p>Other note : the <code>Build Rule</code> for source files with names matching : <code>*.[mc]</code> can use <code>LLVM GCC 4.2</code> or <code>Apple LLVM compiler 4.1</code>, or <code>Default compiler</code></p>

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