I'm trying to update an iOS project from last year. When I load it into Xcode 5.1.1, I get about 40 of the following warning messages:
warning: /Applications/Xcode 5.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: -dynamic not specified, -all_load invalid /Applications/Xcode 5.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: -dynamic not specified the following flags are invalid: -ObjC
I even updated to the latest ShareKit and still have the same problem. I've checked the compiler and architecture settings and they look ok.
To fix this, you will need to remove "Other Linker Flags" from the build settings of the static library.
You can read more at: http://www.cocoanetics.com/2013/02/xcode-4-6-libtool-issues/