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, 1 insertions, 0 deletions

diff --git a/Source/cmPolicies.h b/Source/cmPolicies.h
index 49dec3b..ecb9d67 100644
--- a/Source/cmPolicies.h
+++ b/Source/cmPolicies.h
@@ -55,6 +55,7 @@ public:
     CMP0012, // Strong handling of boolean constants
     CMP0013, // Duplicate binary directories not allowed
     CMP0014, // Input directories must have CMakeLists.txt
+    CMP0015, // set(CACHE) and option() make CACHE value visible
 
     // Always the last entry.  Useful mostly to avoid adding a comma
     // the last policy when adding a new one.