cmake: fix uses of undefined macro identifiers (-Wundef)

include/SDL_config.h.cmake

@@ -49,7 +49,7 @@
 
 /* Comment this if you want to build without any C library requirements */
 #cmakedefine HAVE_LIBC 1
-#if HAVE_LIBC
+#ifdef HAVE_LIBC
 
 /* Useful headers */
 #cmakedefine STDC_HEADERS 1

include/SDL_config.h.in

@@ -53,7 +53,7 @@
 
 /* Comment this if you want to build without any C library requirements */
 #undef HAVE_LIBC
-#if HAVE_LIBC
+#ifdef HAVE_LIBC
 
 /* Useful headers */
 #undef STDC_HEADERS

include/SDL_config_winrt.h

@@ -54,7 +54,7 @@
 
 /* Useful headers */
 #define HAVE_DXGI_H 1
-#if WINAPI_FAMILY != WINAPI_FAMILY_PHONE_APP
+#if !SDL_WINAPI_FAMILY_PHONE
 #define HAVE_XINPUT_H 1
 #endif
 
@@ -161,7 +161,7 @@
 #define SDL_AUDIO_DRIVER_DUMMY  1
 
 /* Enable various input drivers */
-#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
+#if SDL_WINAPI_FAMILY_PHONE
 #define SDL_JOYSTICK_DISABLED 1
 #define SDL_HAPTIC_DISABLED 1
 #else
@@ -208,9 +208,9 @@
 #define SDL_VIDEO_RENDER_D3D11  1
 
 /* Disable D3D12 as it's not implemented for WinRT */
-#define SDL_VIDEO_RENDER_D3D12  0
+/* #undef SDL_VIDEO_RENDER_D3D12 */
 
-#if SDL_VIDEO_OPENGL_ES2
+#ifdef SDL_VIDEO_OPENGL_ES2
 #define SDL_VIDEO_RENDER_OGL_ES2 1
 #endif
 

include/SDL_platform.h

@@ -166,6 +166,12 @@
 #define WINAPI_FAMILY_WINRT 0
 #endif /* HAVE_WINAPIFAMILY_H */
 
+#if (HAVE_WINAPIFAMILY_H) && defined(WINAPI_FAMILY_PHONE_APP)
+#define SDL_WINAPI_FAMILY_PHONE (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
+#else
+#define SDL_WINAPI_FAMILY_PHONE 0
+#endif
+
 #if WINAPI_FAMILY_WINRT
 #undef __WINRT__
 #define __WINRT__ 1