我最近升级到 xCode 4.0.1 以使用最新的 iOS SDK (4.3)。我目前正在开发 iOS 3.X 设备，但希望在不久的将来扩展到 iOS 4.X。
问题是，我似乎无法在我当前的 3.X 设备上成功运行任何东西。据我了解，4.3 SDK支持编译到所有版本的iOS 3.0及后续版本，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，它就会开始加载，然后就崩溃了。
现在我只是试图让默认的基于窗口的应用程序在没有任何修改的情况下运行。我选择了 4.3 作为基础 SDK，并将我的部署目标设置为 3.0。我可以选择从 3.0 开始的每个 iOS 版本作为我的构建目标，但实际上只使用 4.3 似乎完全有效。
当我在手机上运行该应用程序时，我在日志中得到以下信息：
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.
我猜想在某个地方，应用程序没有正确设置为链接到 3.X 版本的 API，因此日志中出现“无法读取符号”的内容。我似乎无法弄清楚如何纠正这种情况。
任何建议不胜感激！