Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -77,6 +77,26 @@
   endif()
 endif()
 
+# Build llvm with ccache if the package is present
+set(LLVM_CCACHE_BUILD OFF CACHE BOOL "Set to ON for a ccache enabled build")
+if(LLVM_CCACHE_BUILD)
+  find_program(CCACHE_PROGRAM ccache)
+  if(CCACHE_PROGRAM)
+      set(LLVM_CCACHE_SIZE "" CACHE STRING "Size of ccache")
+      set(LLVM_CCACHE_DIR "" CACHE STRING "Directory to keep ccached data")
+      set(CCACHE_PROGRAM "CCACHE_CPP2=yes CCACHE_HASHDIR=yes ${CCACHE_PROGRAM}")
+      if (LLVM_CCACHE_SIZE)
+        set(CCACHE_PROGRAM "CCACHE_SIZE=${LLVM_CCACHE_SIZE} ${CCACHE_PROGRAM}")
+      endif()
+      if (LLVM_CCACHE_DIR)
+        set(CCACHE_PROGRAM "CCACHE_DIR=${LLVM_CCACHE_DIR} ${CCACHE_PROGRAM}")
+      endif()
+      set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE_PROGRAM})
+  else()
+    message(FATAL_ERROR "Unable to find the program ccache. Set LLVM_CCACHE_BUILD to OFF")
+  endif()
+endif()
+
 set(LLVM_BUILD_GLOBAL_ISEL OFF CACHE BOOL "Experimental: Build GlobalISel")
 if(LLVM_BUILD_GLOBAL_ISEL)
   add_definitions(-DLLVM_BUILD_GLOBAL_ISEL)