Update cmake_minimum_required to 3.5; support CMake 4.0

CMake 4.0 drops support for CMake <3.5, so minimum versions need to be
adjusted for forward compatibility.

Author: musicinmybrain

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.2)
+cmake_minimum_required(VERSION 3.5)
 project(earcut_hpp LANGUAGES CXX C)
 
 option(EARCUT_BUILD_TESTS "Build the earcut test program" ON)
@@ -35,7 +35,7 @@ add_library(fixtures OBJECT ${FIXTURE_SOURCE_FILES})
 target_compile_options(fixtures PRIVATE $<$<CXX_COMPILER_ID:MSVC>:/Od>)
 
 # In CMake 3.12, use target_link_libraries(fixtures PUBLIC earcut_hpp libtess2).
-# Since we support down to CMake 3.2, we need to manually propagate usage requirements of earcut_hpp
+# Since we support down to CMake 3.5, we need to manually propagate usage requirements of earcut_hpp
 target_include_directories(fixtures PRIVATE "$<TARGET_PROPERTY:earcut_hpp,INTERFACE_INCLUDE_DIRECTORIES>")
 target_compile_features(fixtures PRIVATE "$<TARGET_PROPERTY:earcut_hpp,INTERFACE_COMPILE_FEATURES>")
 

README.md

@@ -89,7 +89,7 @@ If you want to build the test, benchmark and visualization programs instead, fol
 
 Before you continue, make sure to have the following tools and libraries installed:
  * git ([Ubuntu](https://help.ubuntu.com/lts/serverguide/git.html)/[Windows/macOS](http://git-scm.com/downloads))
- * cmake 3.2+ ([Ubuntu](https://launchpad.net/~george-edison55/+archive/ubuntu/cmake-3.x)/[Windows/macOS](https://cmake.org/download/))
+ * cmake 3.5+ ([Ubuntu](https://launchpad.net/~george-edison55/+archive/ubuntu/cmake-3.x)/[Windows/macOS](https://cmake.org/download/))
  * OpenGL SDK ([Ubuntu](http://packages.ubuntu.com/de/trusty/libgl1-mesa-dev)/[Windows](https://dev.windows.com/en-us/downloads/windows-10-sdk)/[macOS](https://developer.apple.com/opengl/))
  * Compiler such as [GCC 4.9+, Clang 3.4+](https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test), [MSVC12+](https://www.visualstudio.com/)