Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -330,6 +330,11 @@
   set(DISABLE_LLVM_DYLIB_ATEXIT 1)
 endif()
 
+option(LLVM_OPTIMIZED_TABLEGEN "Force TableGen to be built with optimization" OFF)
+if(LLVM_OPTIMIZED_TABLEGEN AND LLVM_ENABLE_ASSERTIONS)
+  set(CMAKE_CROSSCOMPILING ON)
+endif()
+
 # All options referred to from HandleLLVMOptions have to be specified
 # BEFORE this include, otherwise options will not be correctly set on
 # first cmake run