Allow native building on Windows

CMakeLists.txt

@@ -116,11 +116,17 @@ function(add_core PLATFORM CORE_NAME)
     if(WIN32)
         set(LIBRETRO_PLATFORM platform=win)
     endif()
+    if(WIN32 AND NOT CMAKE_CROSSCOMPILING)
+        set(CORE_LDFLAGS LDFLAGS="-w ${STATIC_LDFLAGS}")
+    else()
+        set(CORE_LDFLAGS "LDFLAGS=-w ${STATIC_LDFLAGS}")
+    endif()
     add_custom_command(OUTPUT "${TARGET_PATH}"
-        COMMAND CFLAGS=-w CXXFLAGS=-w "LDFLAGS=-w ${STATIC_LDFLAGS}" $(MAKE) -f ${MAKEFILE} CC="${CMAKE_C_COMPILER}" CXX="${CMAKE_CXX_COMPILER}" ${LIBRETRO_PLATFORM}
+        COMMAND CFLAGS=-w CXXFLAGS=-w "${CORE_LDFLAGS}" $(MAKE) -f ${MAKEFILE} CC="${CMAKE_C_COMPILER}" CXX="${CMAKE_CXX_COMPILER}" ${LIBRETRO_PLATFORM}
         COMMAND ${CMAKE_COMMAND} -E copy "${CORE_NAME}_libretro*" "${TARGET_PATH}"
         WORKING_DIRECTORY "cores/${PLATFORM}/${SUBDIR}"
         DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/retro/cores/${CORE_NAME}-version")
+    unset(CORE_LDFLAGS)
 
     add_custom_target(${PLATFORM} ALL DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/retro/cores/${CORE_NAME}-version" "${TARGET_PATH}")
     list(APPEND CORE_TARGETS "${PLATFORM}")

setup.py

@@ -36,7 +36,7 @@ class CMakeBuild(build_ext):
         if not self.inplace:
             pylib_dir = '-DPYLIB_DIRECTORY:PATH=%s' % self.build_lib
         python_executable = '-DPYTHON_EXECUTABLE:STRING=%s' % sys.executable
-        subprocess.check_call(['cmake', '.', pyext_suffix, pylib_dir, python_executable])
+        subprocess.check_call(['cmake', '.', '-G', 'Unix Makefiles', pyext_suffix, pylib_dir, python_executable])
         if self.parallel:
             jobs = ['-j%d' % self.parallel]
         else:

src/retro.cpp

 #include <cmath>
+#ifdef _WIN32
+// pyconfig.h doesn't seem to like hypot, so we need to work around it.
+namespace std {
+	template <typename T>
+	static inline T _hypot(T x, T y) {
+		return hypot(x, y);
+	}
+}
+#endif
 #include <pybind11/pybind11.h>
 #include <pybind11/numpy.h>