Help: Document the $CACHE{} syntax

Also add a test case for the behavior.

2 files changed, 8 insertions, 0 deletions

diff --git a/Help/manual/cmake-language.7.rst b/Help/manual/cmake-language.7.rst
index 87f8f9d..591f73d 100644
--- a/Help/manual/cmake-language.7.rst
+++ b/Help/manual/cmake-language.7.rst
@@ -399,6 +399,11 @@ and how their values are set.
 
 An *environment variable reference* has the form ``$ENV{VAR}`` and
 is evaluated in the same contexts as a normal variable reference.
+See :variable:`ENV` for more information.
+
+A *cache variable reference* has the form ``$CACHE{VAR}`` and
+is evaluated in the same contexts as a normal variable reference.
+See :variable:`CACHE` for more information.
 
 Comments
 --------
@@ -543,6 +548,8 @@ to the binding in the current directory scope, if any.  If a
 is found, or no binding is found, CMake then searches for a
 cache entry.  If a cache entry is found, its value is used.
 Otherwise, the variable reference evaluates to an empty string.
+The ``$CACHE{VAR}`` syntax can be used to do direct cache entry
+lookups.
 
 The :manual:`cmake-variables(7)` manual documents many variables
 that are provided by CMake or have meaning to CMake when set
diff --git a/Help/manual/cmake-variables.7.rst b/Help/manual/cmake-variables.7.rst
index 5a3cd81..4ddbfe5 100644
--- a/Help/manual/cmake-variables.7.rst
+++ b/Help/manual/cmake-variables.7.rst
@@ -230,6 +230,7 @@ Variables that Describe the System
    /variable/ANDROID
    /variable/APPLE
    /variable/BORLAND
+   /variable/CACHE
    /variable/CMAKE_CL_64
    /variable/CMAKE_COMPILER_2005
    /variable/CMAKE_HOST_APPLE