FindProtobuf: Rename variables to match case of module name

Use recommended case for variable names. i.e. matching name of the
module as passed to `find_package`.

For backwards compatibility, the upper case versions of both input and
output variables are used and defined when appropriate.  Skip this for
the _FOUND variable because FPHSA already does it.  Skip this for the
_VERSION variable because that was recently added and never available
with the old name in a release of CMake.

2 files changed, 8 insertions, 1 deletions

diff --git a/Help/release/dev/FindProtobuf-variable-case.rst b/Help/release/dev/FindProtobuf-variable-case.rst
new file mode 100644
index 0000000..0df00e7
--- /dev/null
+++ b/Help/release/dev/FindProtobuf-variable-case.rst
@@ -0,0 +1,7 @@
+FindProtobuf-variable-case
+--------------------------
+
+* The :module:`FindProtobuf` module input and output variables were all renamed
+  from ``PROTOBUF_`` to ``Protobuf_`` for consistency with other find modules.
+  Input variables of the old case will be honored if provided, and output
+  variables of the old case are always provided.
diff --git a/Help/release/dev/FindProtobuf-version.rst b/Help/release/dev/FindProtobuf-version.rst
index 2bfd9f4..40c2ff5 100644
--- a/Help/release/dev/FindProtobuf-version.rst
+++ b/Help/release/dev/FindProtobuf-version.rst
@@ -1,6 +1,6 @@
 FindProtobuf-version
 --------------------
 
-* The :module:`FindProtobuf` module learned to provide a ``PROTOBUF_VERSION``
+* The :module:`FindProtobuf` module learned to provide a ``Protobuf_VERSION``
   variable and check the version number requested in a :command:`find_package`
   call.