Increment minimum required CMake version to 3.15 (nonstd-lite issue 73)

nonstd-lite/nonstd-lite#73

Author: martinmoene

CMakeLists.txt

@@ -3,7 +3,7 @@
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
 # file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-cmake_minimum_required( VERSION 3.5 FATAL_ERROR )
+cmake_minimum_required( VERSION 3.15 FATAL_ERROR )
 
 project(
     lest

example/CMakeLists.txt

@@ -8,7 +8,7 @@
 # -Dlest_FEATURE_TIME=1
 
 if( NOT DEFINED CMAKE_MINIMUM_REQUIRED_VERSION )
-    cmake_minimum_required( VERSION 3.5 FATAL_ERROR )
+    cmake_minimum_required( VERSION 3.15 FATAL_ERROR )
 endif()
 
 project( examples )

test/CMakeLists.txt

@@ -8,7 +8,7 @@
 # -Dlest_FEATURE_TIME=1
 
 if( NOT DEFINED CMAKE_MINIMUM_REQUIRED_VERSION )
-    cmake_minimum_required( VERSION 3.5 FATAL_ERROR )
+    cmake_minimum_required( VERSION 3.15 FATAL_ERROR )
 endif()
 
 project( test LANGUAGES CXX )