Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -137,11 +137,11 @@
 if(LLVM_CCACHE_BUILD)
   find_program(CCACHE_PROGRAM ccache)
   if(CCACHE_PROGRAM)
-      set(LLVM_CCACHE_SIZE "" CACHE STRING "Size of ccache")
+      set(LLVM_CCACHE_MAXSIZE "" 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} ${CCACHE_PROGRAM}")
+      if (LLVM_CCACHE_MAXSIZE)
+        set(CCACHE_PROGRAM "CCACHE_MAXSIZE=${LLVM_CCACHE_MAXSIZE} ${CCACHE_PROGRAM}")
       endif()
       if (LLVM_CCACHE_DIR)
         set(CCACHE_PROGRAM "CCACHE_DIR=${LLVM_CCACHE_DIR} ${CCACHE_PROGRAM}")
Index: docs/CMake.rst
===================================================================
--- docs/CMake.rst
+++ docs/CMake.rst
@@ -551,6 +551,13 @@
   <http://clang.llvm.org/docs/SourceBasedCodeCoverage.html>`_ instrumentation
   is enabled while building llvm.
 
+**LLVM_CCACHE_BUILD**:BOOL
+  If enabled and the ``ccache`` program is available, then LLVM will be
+  built using ``ccache`` to speed up rebuilds of LLVM and its components.
+  Defaults to OFF.  The size and location of the cache maintained
+  by ``ccache`` can be adjusted via the LLVM_CCACHE_MAXSIZE and LLVM_CCACHE_DIR
+  options respectively.
+
 CMake Caches
 ============