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This patch has been taken from:
http://thread.gmane.org/gmane.comp.compilers.llvm.cvs/128419/focus=128572

diff -ur llvm-3.2.src.orig/cmake/modules/AddLLVM.cmake llvm-3.2.src/cmake/modules/AddLLVM.cmake
--- llvm-3.2.src.orig/cmake/modules/AddLLVM.cmake	2012-12-27 14:33:13.000000000 +1100
+++ llvm-3.2.src/cmake/modules/AddLLVM.cmake	2012-12-27 14:35:37.000000000 +1100
@@ -277,7 +277,9 @@
     COMMAND ${LIT_COMMAND} ${ARG_DEFAULT_ARGS}
     COMMENT "${comment}"
     )
-  add_dependencies(${target} ${ARG_DEPENDS})
+  if( ARG_DEPENDS )
+    add_dependencies(${target} ${ARG_DEPENDS})
+  endif()
 endfunction()
 
 # A function to add a set of lit test suites to be driven through 'check-*' targets.