documentation: Bump CMake version to 3.16

buildsystem: Integrate with new Python3.cmake functions (NumPy)

Author: simonsan

Diff for: CMakeLists.txt

@@ -1,8 +1,8 @@
 # Copyright 2013-2020 the openage authors. See copying.md for legal info.
 
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.16)
 
-# required for FindPython3.cmake
+# finding numpy with the findpython3 module
 # >3.8 required for CMAKE_CXX_STANDARD for C++17
 
 # main build configuration file

Diff for: buildsystem/HandlePythonOptions.cmake

@@ -1,16 +1,17 @@
-# Copyright 2015-2018 the openage authors. See copying.md for legal info.
+# Copyright 2015-2020 the openage authors. See copying.md for legal info.
 
 # finds the python interpreter, install destination and extension flags.
 
 # the Python version number requirement is in modules/FindPython_test.cpp
 find_package(Python ${PYTHON_MIN_VERSION} REQUIRED)
 find_package(Cython ${CYTHON_MIN_VERSION} REQUIRED)
-find_package(Numpy REQUIRED)
 
 py_get_config_var(EXT_SUFFIX PYEXT_SUFFIX)
 
 # This is the only useful thing after cleaning up what python suggests
-set(PYEXT_CXXFLAGS "-fwrapv")
+if(NOT "${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
+	set(PYEXT_CXXFLAGS "-fwrapv")
+endif()
 
 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
 	# suppress #warning about deprecated numpy api

Diff for: buildsystem/modules/FindNumpy.cmake

@@ -33,7 +33,7 @@ endif()
 set(Python3_FIND_REGISTRY "NEVER")
 
 # use cmake's FindPython3 to locate library and interpreter
-find_package(Python3 ${PYTHON_MIN_VERSION} COMPONENTS Interpreter Development)
+find_package(Python3 ${PYTHON_MIN_VERSION} COMPONENTS Interpreter Development NumPy)
 
 
 # python version string to cpython api test in modules/FindPython_test.cpp
@@ -65,6 +65,11 @@ elseif(PYTHON_TEST_RESULT)
 	set(PYTHON_INCLUDE_DIRS ${Python3_INCLUDE_DIRS} CACHE PATH "Location of the Python include dir" FORCE)
 	set(PYTHONLIBS_VERSION_STRING ${Python3_VERSION})
 
+	# Numpy.cmake vars <= Python3.cmake vars
+	set(NUMPY_FOUND ${Python3_NumPy_FOUND})
+	set(NUMPY_VERSION ${Python3_NumPy_VERSION})
+	set(NUMPY_INCLUDE_DIR ${Python3_NumPy_INCLUDE_DIRS} CACHE STRING "Linker invocation for the NumPy library" FORCE)
+
 	include(FindPackageHandleStandardArgs)
 	find_package_handle_standard_args(Python REQUIRED_VARS PYTHON PYTHON_INCLUDE_DIRS PYTHON_LIBRARIES)
 endif()

Diff for: buildsystem/modules/FindPython.cmake

@@ -1,4 +1,4 @@
-# Copyright 2014-2019 the openage authors. See copying.md for legal info.
+# Copyright 2014-2020 the openage authors. See copying.md for legal info.
 
 # provides macros for defining python extension modules and pxdgen sources.
 # and a 'finalize' function that must be called in the end.
@@ -54,7 +54,7 @@ function(add_cython_modules)
 	# test.pyx is compiled to a shared library linked against PYEXT_LINK_LIBRARY
 	# __main__.pyx is compiled to a executable with embedded python interpreter,
 	# linked against libpython and PYEXT_LINK_LIBRARY.
-	# foo/bar.pyx is compiled to a executable with embedded pytthon interpreter,
+	# foo/bar.pyx is compiled to a executable with embedded python interpreter,
 	# linked only against libpython.
 	# foo/test.pyx is compiled to a shared library linked against nothing, and will
 	# not be installed.
@@ -196,7 +196,7 @@ function(add_pxds)
 		endif()
 
 		if(NOT "${source}" MATCHES ".*\\.px[id]$")
-			message(FATAL_ERROR "non-pxd/pxi file given to add_pyd: ${source}")
+			message(FATAL_ERROR "non-pxd/pxi file given to add_pxds: ${source}")
 		endif()
 
 		set_property(GLOBAL APPEND PROPERTY SFT_PXD_FILES "${source}")

Diff for: buildsystem/python.cmake

@@ -30,7 +30,7 @@ Dependency list:
     C     gcc >=7 or clang >=5
     CRA   python >=3.6
     C     cython >=0.25
-    C     cmake >=3.12
+    C     cmake >=3.16
       A   numpy
       A   python imaging library (PIL) -> pillow
     CR    opengl >=3.3