ios - libtool failed with exit code 1 in Xcode 4.2 -

ios - libtool failed with exit code 1 in Xcode 4.2 -

i compile project, shows error:

libtool /users/trinstanchen/library/developer/xcode/deriveddata/iossocial-dedmezxegpbuqnfkhmbfrvtphyas/build/products/debug-iphonesimulator/libiossocial.a normal i386 cd "/users/trinstanchen/downloads/iossocial-develop copy/iossocial" setenv iphoneos_deployment_target 5.0 setenv path "/applications/xcode.app/contents/developer/platforms/iphonesimulator.platform/developer/usr/bin:/applications/xcode.app/contents/developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /applications/xcode.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/libtool -static -arch_only i386 -syslibroot /applications/xcode.app/contents/developer/platforms/iphonesimulator.platform/developer/sdks/iphonesimulator6.0.sdk -l/users/trinstanchen/library/developer/xcode/deriveddata/iossocial-dedmezxegpbuqnfkhmbfrvtphyas/build/products/debug-iphonesimulator -filelist /users/trinstanchen/library/developer/xcode/deriveddata/iossocial-dedmezxegpbuqnfkhmbfrvtphyas/build/intermediates/iossocial.build/debug-iphonesimulator/iossocial.build/objects-normal/i386/iossocial.linkfilelist -objc -fno-objc-arc -framework coregraphics -framework sentestingkit -framework uikit -framework foundation -o /users/trinstanchen/library/developer/xcode/deriveddata/iossocial-dedmezxegpbuqnfkhmbfrvtphyas/build/products/debug-iphonesimulator/libiossocial.a

/applications/xcode.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/libtool: unknown alternative character `f' in: -fno-objc-arc usage: /applications/xcode.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/libtool -static [-] file [...] [-filelist listfile[,dirname]] [-arch_only arch] [-saclt] usage: /applications/xcode.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/libtool -dynamic [-] file [...] [-filelist listfile[,dirname]] [-arch_only arch] [-o output] [-install_name name] [-compatibility_version #] [-current_version #] [-seg1addr 0x#] [-segs_read_only_addr 0x#] [-segs_read_write_addr 0x#] [-seg_addr_table ] [-seg_addr_table_filename ] [-all_load] [-noall_load] command /applications/xcode.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/libtool failed exit code 1

can give me help?

ios xcode