Bump CMake minimum to 2.8.12

CMakeLists.txt

 # Note: CMake support is community-based. The maintainers do not use CMake
 # internally.
 
-cmake_minimum_required(VERSION 2.8.8)
+cmake_minimum_required(VERSION 2.8.12)
 
 if (POLICY CMP0048)
   cmake_policy(SET CMP0048 NEW)

CONTRIBUTING.md

@@ -89,7 +89,7 @@ and their own tests from a git checkout, which has further requirements:
 
 *   [Python](https://www.python.org/) v2.3 or newer (for running some of the
     tests and re-generating certain source files from templates)
-*   [CMake](https://cmake.org/) v2.6.4 or newer
+*   [CMake](https://cmake.org/) v2.8.12 or newer
 
 ## Developing Google Test and Google Mock
 

googlemock/CMakeLists.txt

@@ -42,7 +42,7 @@ else()
   cmake_policy(SET CMP0048 NEW)
   project(gmock VERSION ${GOOGLETEST_VERSION} LANGUAGES CXX C)
 endif()
-cmake_minimum_required(VERSION 2.6.4)
+cmake_minimum_required(VERSION 2.8.12)
 
 if (COMMAND set_up_hermetic_build)
   set_up_hermetic_build()

googletest/CMakeLists.txt

@@ -53,7 +53,7 @@ else()
   cmake_policy(SET CMP0048 NEW)
   project(gtest VERSION ${GOOGLETEST_VERSION} LANGUAGES CXX C)
 endif()
-cmake_minimum_required(VERSION 2.6.4)
+cmake_minimum_required(VERSION 2.8.12)
 
 if (POLICY CMP0063) # Visibility
   cmake_policy(SET CMP0063 NEW)

googletest/README.md

@@ -75,7 +75,7 @@ pulled into the main build with `add_subdirectory()`. For example:
 New file `CMakeLists.txt.in`:
 
 ```cmake
-cmake_minimum_required(VERSION 2.8.2)
+cmake_minimum_required(VERSION 2.8.12)
 
 project(googletest-download NONE)