CMake build system: support for parallel builds.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56453 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index c3641ea..fc917d3 100755
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -3,6 +3,10 @@
 macro(add_llvm_library name)
   add_library( ${name} ${ARGN} )
   set( llvm_libs ${llvm_libs} ${name} PARENT_SCOPE)
+  set( llvm_lib_targets ${llvm_lib_targets} ${name} PARENT_SCOPE )
+  if( LLVM_COMMON_DEPENDS )
+    add_dependencies( ${name} ${LLVM_COMMON_DEPENDS} )
+  endif( LLVM_COMMON_DEPENDS )
 endmacro(add_llvm_library name)