making tweak fail after upgrade my Xcode to 4.5

[ElfeXu]

I followed http://brandontreb.com/beginning-jailbroken-ios-development-getting-the-tools/ to use theos implementing a tweak. Everything worked fine.
Then upgrade my Xcode to 4.5.
Then when compiling any tweak projects, even a hello world, it failed with following error:

Making all for tweak PreferenceLoader...
Preprocessing Tweak.xm...
Compiling Tweak.xm...
Linking tweak PreferenceLoader...
collect2: ld terminated with signal 6 [Abort trap: 6]
ld(8724,0x7fff78fd2960) malloc: *** error for object 0x7f89b35003f0: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
make[2]: *** [obj/PreferenceLoader.dylib] Error 1
make[1]: *** [internal-library-all_] Error 2
make: *** [PreferenceLoader.all.tweak.variables] Error 2

I found this http://iphonesdkdev.blogspot.jp/2012/06/how-to-install-thoes-under-xcode-44.html, followed all steps, but still no luck.

Any ideas on the linking tool's crash?

[DHowett]

Xcode 4.5 ships with two different versions of the same linker. The one used by gcc (which is deprecated) crashes on armv6 output, and the one used by clang can not generate armv6 output.
There is currently no way to use the 6.0 SDK while targeting iOS versions less than 4.3, or any armv6 platforms.
If you're willing to accept this, please add the following to the top of your Makefile:

export ARCHS=armv7
export TARGET=iphone:latest:4.3

(note from theiostream)
Alternatively, it is possible to use older SDKs (if you have them) and build for both architectures and older deployment targets.

export ARCHS = armv6 armv7
export TARGET=iphone:<sdkversion-lower-than-6.0>:<deployment target-higher-than-3.0>

[ElfeXu]

Hi Howett,
Sorry for the late response as I was on vacation before.
Yes, set the ARCHS and TARGET works fine. Thank you very much.