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我最近升级到xCode 4.0.1以便使用最新的iOS SDK（4.3）。我目前正在为iOS 3.X设备开发，但在不久的将来希望扩展到iOS 4.X。无法运行使用iOS SDK 4.3编译的iOS 3.X应用程序
问题是，我似乎无法成功运行我的当前3.X设备上的任何东西。据我了解，4.3 SDK支持编译到所有版本的iOS 3.0及其后续，当然我可以编译这样的应用程序就好了。但是，如果我尝试在模拟器或设备上运行它，它会开始加载，然后崩溃。
现在我只是试图让默认的基于窗口的应用程序运行没有任何修改。我选择了4.3作为基础SDK，并将我的部署目标设置为3.0。我可以从3.0版本中选择每个版本的iOS作为我的构建目标，但只有使用4.3才能真正起作用。
当我跑我的手机上的应用程序，我获取日志中的以下内容：
GNU gdb 6.3.50-20050815 (Apple version gdb-1518) (Sat Feb 12 02:56:02 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "--host=x86_64-apple-darwin --target=arm-apple-darwin".tty /dev/ttys002
warning: Unable to read symbols from "dyld" (prefix __dyld_) (not yet mapped into memory).
warning: Unable to read symbols for /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.1.3 (7E18)/Symbols/System/Library/Frameworks/UIKit.framework/UIKit (file not found).
warning: Unable to read symbols from "UIKit" (not yet mapped into memory).
warning: Unable to read symbols from "Foundation" (not yet mapped into memory).
warning: Unable to read symbols for /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.1.3 (7E18)/Symbols/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics (file not found).
warning: Unable to read symbols from "CoreGraphics" (not yet mapped into memory).
warning: Unable to read symbols from "libgcc_s.1.dylib" (not yet mapped into memory).
warning: Unable to read symbols from "libSystem.B.dylib" (not yet mapped into memory).
warning: Unable to read symbols from "libobjc.A.dylib" (not yet mapped into memory).
warning: Unable to read symbols from "CoreFoundation" (not yet mapped into memory).
target remote-mobile /tmp/.XcodeGDBRemote-18423-39
Switching to remote-macosx protocol
mem 0x1000 0x3fffffff cache
mem 0x40000000 0xffffffff none
mem 0x00000000 0x0fff none
[Switching to process 11779 thread 0x0]
[Switching to process 11779 thread 0x0]
gdb stack crawl at point of internal error:
0 gdb-arm-apple-darwin 0x000000010010974a internal_vproblem + 308
1 gdb-arm-apple-darwin 0x0000000100109924 internal_verror + 27
2 gdb-arm-apple-darwin 0x00000001001099c2 align_down + 0
3 gdb-arm-apple-darwin 0x0000000100150c5e macosx_solib_add + 794
4 gdb-arm-apple-darwin 0x000000010016417c remote_macosx_complete_create_or_attach + 187
5 gdb-arm-apple-darwin 0x000000010016489e remote_macosx_create_inferior + 1252
6 gdb-arm-apple-darwin 0x000000010005f6c3 run_command_1 + 586
7 gdb-arm-apple-darwin 0x0000000100107b7f execute_command + 557
8 gdb-arm-apple-darwin 0x00000001000171e7 mi_execute_async_cli_command + 204
9 gdb-arm-apple-darwin 0x00000001000168e5 captured_mi_execute_command + 344
10 gdb-arm-apple-darwin 0x0000000100072a62 catch_exception + 57
11 gdb-arm-apple-darwin 0x000000010001443e mi_execute_command + 140
12 gdb-arm-apple-darwin 0x0000000100077721 process_event + 133
13 gdb-arm-apple-darwin 0x0000000100078435 gdb_do_one_event + 1049
14 gdb-arm-apple-darwin 0x0000000100072b49 catch_errors + 70
/SourceCache/gdb/gdb-1518/src/gdb/macosx/macosx-nat-dyld.c:1648: internal-error: unrecognized shared library breakpoint
A problem internal to GDB has been detected,
further debugging may prove unreliable.
我猜测，沿线某处，应用程序的不正确设置链接到3 .X版本的API，因此“无法读取符号”的东西出现在日志中。我似乎无法弄清楚如何纠正这种情况。
任何建议感激地赞赏！
感谢您的建议。看起来它最终可能是供应配置文件 - 仅仅为了一个百灵之源，我尝试了一个全新的手机来查看它是否可行（当然这需要更新供应配置文件），并且它工作正常。再次感谢！ – Mac 2011-04-12 01:43:05
很高兴能帮到你！ – 2011-04-13 22:32:14