Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 failed with exit code 1

Question

My XCode version is 4.2 for iOS 5.0. I choose "LLVM GCC 4.2" as the compiler. When I compile my project, it show me the following error:

ld: warning: directory not found for option '-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/gcc/arm-apple-darwin10/4.0.1'
ld: warning: directory not found for option '-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/gcc/arm-apple-darwin10/4.2.1'
ld: library not found for -lz.1.2.3
Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 failed with exit code 1

Please help me figure out why this is happening and how to fix it.

Answer 1

The libz.1.2.3 library does not exist anymore (or at least is not included in the SDK). In your project settings, link with a newer version of the library like libz.1.2.5.