Index: cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- cmake/modules/HandleLLVMOptions.cmake	(revision 126807)
+++ cmake/modules/HandleLLVMOptions.cmake	(working copy)
@@ -102,6 +102,27 @@
   endif( LLVM_BUILD_32_BITS )
 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
 
+if( MSVC_IDE AND ( MSVC90 OR MSVC10 ) )
+  # Only Visual Studio 2008 and 2010 officially supports /MP. 
+  # Visual Studio 2005 do support it but it's experimental there.
+  if( NOT LLVM_COMPILER_JOBS STREQUAL "1" )
+    if( LLVM_COMPILER_JOBS STREQUAL "0" )
+      add_llvm_definitions( /MP )
+    else()
+      if (MSVC10)
+        message(FATAL_ERROR
+          "Due to a bug in CMake only 0 and 1 is supported for "
+          "LLVM_COMPILER_JOBS when generating for Visual Studio 2010")
+      else()
+        message(STATUS "Number of parallel compiler jobs set to " ${LLVM_COMPILER_JOBS})
+        add_llvm_definitions( /MP${LLVM_COMPILER_JOBS} )
+      endif()
+    endif()
+  else()
+    message(STATUS "Parallel compilation disabled")
+  endif()
+endif()
+
 if( MSVC )
   include(ChooseMSVCCRT)
 
Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt	(revision 126807)
+++ CMakeLists.txt	(working copy)
@@ -133,6 +133,13 @@
 
 include(AddLLVMDefinitions)
 
+if( MSVC_IDE AND ( MSVC90 OR MSVC10 ) )
+  # Only Visual Studio 2008 and 2010 officially supports /MP. 
+  # Visual Studio 2005 do support it but it's experimental there.
+  set(LLVM_COMPILER_JOBS "0" CACHE STRING
+    "Number of parallel compiler jobs. 0 means use all processors. Default is 0.")
+endif()
+
 option(LLVM_ENABLE_PIC "Build Position-Independent Code" ON)
 
 # MSVC has a gazillion warnings with this.
Index: docs/CMake.html
===================================================================
--- docs/CMake.html	(revision 126807)
+++ docs/CMake.html	(working copy)
@@ -452,6 +452,22 @@
 
 </div>
 
+<div class="doc_subsection">
+  <a name="msvc">Microsoft Visual C++</a>
+</div>
+
+<div class="doc_text">
+
+<dl>
+  <dt><b>LLVM_COMPILER_JOBS</b>:STRING</dt>
+  <dd>Specifies the maximum number of parallell compiler jobs to use 
+    per project when building with msbuild or Visual Studio. Only supported for 
+    Visual Studio 2008 and Visual Studio 2010 CMake generators. 0 means use all
+    processors. Default is 0.</dd>
+</dl>
+
+</div>
+
 <!-- *********************************************************************** -->
 
 <hr>