Create CMake Policy CMP0015 to fix set(CACHE)

The set(CACHE) and option() commands should always expose the cache
value.  Previously we failed to expose the value when it was already set
if a local variable definition hid it.  When set to NEW, this policy
tells the commands to always remove the local variable definition to
expose the cache value.  See issue #9008.

1 files changed, 5 insertions, 0 deletions

diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 6c3d218dd5..a3a16b6c5b 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -291,6 +291,11 @@ public:
                           bool force = false);
 
   /**
+   * Update the variable scope to make the cache definition visible.
+   */
+  void UseCacheDefinition(cmCacheManager::CacheIterator const& it);
+
+  /**
    * Add bool variable definition to the build. 
    */
   void AddDefinition(const char* name, bool);