IOS-There are about static libraries Apple Mach-o Linker Error && Undefined Symbols for Architecture * * *:

Recently and offsite colleagues to test a static library, after he compiled the static library sent to use, a compilation will be error, such as:

There are many reasons for this error, but one reason that is not available online is that the version of Xcode used when compiling a static library is less than the version of Xcode used by the current project. That's not easy to find, and I was in his hair. A project that was created in the XCODE4 environment where he was compiled was found in a calling project. And our current project is XCODE5.

This problem is very dog blood, especially off-site commissioning ...