Xcode 6 simulator creates missing character for _clock $ UNIX2003

Question

I am creating a Unity project for the iOS8 simulator. Moving this for Xcode 6 GM for the simulator led to this linker error. Not sure if I missed something in the assembly or something is broken. Any suggestions? Full error:

Undefined symbols for i386 architecture: "_clock $ UNIX2003" referenced: _substanceHandleSwitchHard in libiPhone-lib.a (apihandle.o) _mainRenderProcess in libiPhone-lib.a (mainrenderprocess.o) ld: characters (characters) not found for i386 architecture

Output with code 1

Answer 1

clock $ UNIX2003 is a character provided by OS X and is not part of the iOS Simulator runtime. iOS is always compatible and therefore does not have an obsolete (not $ UNIX2003) version of the features (which are provided for binary compatibility with code created for older versions of the OS X SDK).

The common cause of the problem you see is that you have an object file or archive (libsomething.a) that was created against the OS X SDK and is trying to link it to the iOS Simulator executable. This is not supported because the two platforms are not compatible with binary data at this level.

You need to rebuild your library (libsomething.a) against the iOS Simulator SDK.

Answer 2

Add the following to the end of main.mm

 #include <time.h> extern "C" { clock_t clock$UNIX2003(void) { return clock(); } }