CMake: Require at least CMake 3.10

This is the current minimum according to
https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md

PiperOrigin-RevId: 472714045
Change-Id: I5930bbbc4eec4644d22bba703957d1764c2e76be

CMake/Googletest/CMakeLists.txt.in

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.2)
+cmake_minimum_required(VERSION 3.10)
 
 project(googletest-external NONE)
 

CMake/README.md

@@ -39,7 +39,7 @@ section of your executable or of your library.<br>
 Here is a short CMakeLists.txt example of an application project using Abseil.
 
 ```cmake
-cmake_minimum_required(VERSION 3.8.2)
+cmake_minimum_required(VERSION 3.10)
 project(my_app_project)
 
 # Pick the C++ standard to compile with.
@@ -62,7 +62,7 @@ will control Abseil library targets) is set to at least that minimum. For
 example:
 
 ```cmake
-cmake_minimum_required(VERSION 3.8.2)
+cmake_minimum_required(VERSION 3.10)
 project(my_lib_project)
 
 # Leave C++ standard up to the root application, so set it only if this is the

CMake/install_test_project/CMakeLists.txt

@@ -15,7 +15,7 @@
 
 # A simple CMakeLists.txt for testing cmake installation
 
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.10)
 project(absl_cmake_testing CXX)
 
 add_executable(simple simple.cc)

CMakeLists.txt

@@ -14,12 +14,9 @@
 # limitations under the License.
 #
 
-# Most widely used distributions have cmake 3.5 or greater available as of March
-# 2019.  A notable exception is RHEL-7 (CentOS7).  You can install a current
-# version of CMake by first installing Extra Packages for Enterprise Linux
-# (https://fedoraproject.org/wiki/EPEL#Extra_Packages_for_Enterprise_Linux_.28EPEL.29)
-# and then issuing `yum install cmake3` on the command line.
-cmake_minimum_required(VERSION 3.5)
+# https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md
+# As of 2022-09-06, CMake 3.10 is the minimum supported version.
+cmake_minimum_required(VERSION 3.10)
 
 # Compiler id for Apple Clang is now AppleClang.
 if (POLICY CMP0025)