Move googletest version variable into external CMake file and include in subsequent projects

Fixes #4309

CMakeLists.txt

@@ -4,7 +4,9 @@
 cmake_minimum_required(VERSION 3.13)
 
 project(googletest-distribution)
-set(GOOGLETEST_VERSION 1.14.0)
+
+# Import googletest version
+include(cmake/googletest-version.cmake)
 
 if(NOT CYGWIN AND NOT MSYS AND NOT ${CMAKE_SYSTEM_NAME} STREQUAL QNX)
   set(CMAKE_CXX_EXTENSIONS OFF)

cmake/googletest-version.cmake

@@ -0,0 +1 @@
+set(GOOGLETEST_VERSION 1.14.0)

googlemock/CMakeLists.txt

@@ -8,6 +8,9 @@
 # ctest. You can select which tests to run using 'ctest -R regex'.
 # For more options, run 'ctest --help'.
 
+# Import googletest version
+include(../cmake/googletest-version.cmake)
+
 option(gmock_build_tests "Build all of Google Mock's own tests." OFF)
 
 # A directory to find Google Test sources.

googletest/CMakeLists.txt

@@ -10,6 +10,10 @@
 
 # When other libraries are using a shared version of runtime libraries,
 # Google Test also has to use one.
+
+# Import googletest version
+include(../cmake/googletest-version.cmake)
+
 option(
   gtest_force_shared_crt
   "Use shared (DLL) run-time lib even when Google Test is built as static lib."