CMakeVersion: Use '-rc0' version suffix on release branches prior to rc1

Revert the change from commit 7b354baad5 (CMakeVersion: Set
CMake_VERSION_RC to 0 even in non-rc versions, 2019-07-25) and instead
define a `0` value in `CMake_VERSION_RC` to mean `-rc0`.  This
distinguishes release branch versions prior to the first release
candidate from the first release candidate itself.  It also makes room
for a dedicated "CMake $major.$minor.0-rc1" release commit for `-rc1` as
we have for later release candidates and final releases.

3 files changed, 7 insertions, 7 deletions

diff --git a/Help/dev/maint.rst b/Help/dev/maint.rst
index a1732c8..75a1d68 100644
--- a/Help/dev/maint.rst
+++ b/Help/dev/maint.rst
@@ -178,7 +178,7 @@ Commit with a message such as::
   the CMake Release Notes index page.
 
 Update ``Source/CMakeVersion.cmake`` to set the version to
-``$major.$minor.0-rc1``:
+``$major.$minor.0-rc0``:
 
 .. code-block:: cmake
 
@@ -186,7 +186,7 @@ Update ``Source/CMakeVersion.cmake`` to set the version to
   set(CMake_VERSION_MAJOR $major)
   set(CMake_VERSION_MINOR $minor)
   set(CMake_VERSION_PATCH 0)
-  set(CMake_VERSION_RC 1)
+  set(CMake_VERSION_RC 0)
 
 Update uses of ``DEVEL_CMAKE_VERSION`` in the source tree to mention the
 actual version number:
@@ -197,7 +197,7 @@ actual version number:
 
 Commit with a message such as::
 
-  CMake $major.$minor.0-rc1 version update
+  Begin $ver release versioning
 
 Merge the ``release-$ver`` branch to ``master``:
 
@@ -217,7 +217,7 @@ note infrastructure and the version date from ``origin/master``:
   sed -i $'/^Releases/ i\\\n.. include:: dev.txt\\\n' Help/release/index.rst
 
 Update ``Source/CMakeVersion.cmake`` to set the version to
-``$major.$minor.$date`` (and RC ``0`` to disable the suffix):
+``$major.$minor.$date``:
 
 .. code-block:: cmake
 
@@ -225,7 +225,7 @@ Update ``Source/CMakeVersion.cmake`` to set the version to
   set(CMake_VERSION_MAJOR $major)
   set(CMake_VERSION_MINOR $minor)
   set(CMake_VERSION_PATCH $date)
-  set(CMake_VERSION_RC 0)
+  #set(CMake_VERSION_RC 0)
 
 Commit with a message such as::
 
diff --git a/Source/CMakeVersion.cmake b/Source/CMakeVersion.cmake
index 942ead0..ea3b43a 100644
--- a/Source/CMakeVersion.cmake
+++ b/Source/CMakeVersion.cmake
@@ -2,4 +2,4 @@
 set(CMake_VERSION_MAJOR 3)
 set(CMake_VERSION_MINOR 15)
 set(CMake_VERSION_PATCH 20190726)
-set(CMake_VERSION_RC 0)
+#set(CMake_VERSION_RC 0)
diff --git a/Source/CMakeVersionCompute.cmake b/Source/CMakeVersionCompute.cmake
index 72a5800..160f470 100644
--- a/Source/CMakeVersionCompute.cmake
+++ b/Source/CMakeVersionCompute.cmake
@@ -16,7 +16,7 @@ endif()
 set(CMake_VERSION ${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH})
 if(CMake_VERSION_SOURCE)
   set(CMake_VERSION_SUFFIX "${CMake_VERSION_SOURCE}")
-elseif(CMake_VERSION_RC)
+elseif(DEFINED CMake_VERSION_RC)
   set(CMake_VERSION_SUFFIX "rc${CMake_VERSION_RC}")
 else()
   set(CMake_VERSION_SUFFIX "")