Use #ifdef/#ifndef instead of #if defined/#if \!defined

src/core/haiku/SDL_BeApp.cc

@@ -20,7 +20,7 @@
 */
 #include "SDL_internal.h"
 
-#if defined(__HAIKU__)
+#ifdef __HAIKU__
 
 /* Handle the BeApp specific portions of the application */
 

src/core/linux/SDL_fcitx.c

@@ -61,7 +61,7 @@ static char *GetAppName(void)
     char linkfile[1024];
     int linksize;
 
-#if defined(__LINUX__)
+#ifdef __LINUX__
     (void)SDL_snprintf(procfile, sizeof(procfile), "/proc/%d/exe", getpid());
 #elif defined(__FREEBSD__)
     (void)SDL_snprintf(procfile, sizeof(procfile), "/proc/%d/file", getpid());

src/core/openbsd/SDL_wscons_kbd.c

@@ -319,7 +319,7 @@ static struct wscons_keycode_to_SDL
     { KS_f18, SDL_SCANCODE_F18 },
     { KS_f19, SDL_SCANCODE_F19 },
     { KS_f20, SDL_SCANCODE_F20 },
-#if !defined(__NetBSD__)
+#ifndef __NetBSD__
     { KS_f21, SDL_SCANCODE_F21 },
     { KS_f22, SDL_SCANCODE_F22 },
     { KS_f23, SDL_SCANCODE_F23 },

src/core/windows/SDL_windows.c

@@ -25,7 +25,7 @@
 #include "SDL_windows.h"
 
 #include <objbase.h> /* for CoInitialize/CoUninitialize (Win32 only) */
-#if defined(HAVE_ROAPI_H)
+#ifdef HAVE_ROAPI_H
 #include <roapi.h> /* For RoInitialize/RoUninitialize (Win32 only) */
 #else
 typedef enum RO_INIT_TYPE
@@ -411,7 +411,7 @@ SDL_RunApp(int _argc, char* _argv[], SDL_main_func mainFunction, void * reserved
 /*
  * Public APIs
  */
-#if !defined(SDL_VIDEO_DRIVER_WINDOWS)
+#ifndef SDL_VIDEO_DRIVER_WINDOWS
 
 #if defined(__WIN32__) || defined(__GDK__)
 int SDL_RegisterApp(const char *name, Uint32 style, void *hInst)

src/core/windows/SDL_windows.h

@@ -24,7 +24,7 @@
 #ifndef _INCLUDED_WINDOWS_H
 #define _INCLUDED_WINDOWS_H
 
-#if defined(__WIN32__)
+#ifdef __WIN32__
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN 1
 #endif
@@ -36,7 +36,7 @@
 #endif
 #undef WINVER
 #undef _WIN32_WINNT
-#if defined(SDL_VIDEO_RENDER_D3D12)
+#ifdef SDL_VIDEO_RENDER_D3D12
 #define _WIN32_WINNT 0xA00 /* For D3D12, 0xA00 is required */
 #elif defined(HAVE_SHELLSCALINGAPI_H)
 #define _WIN32_WINNT 0x603 /* For DPI support */
@@ -118,7 +118,7 @@ extern int WIN_SetErrorFromHRESULT(const char *prefix, HRESULT hr);
 /* Sets an error message based on GetLastError(). Always return -1. */
 extern int WIN_SetError(const char *prefix);
 
-#if !defined(__WINRT__)
+#ifndef __WINRT__
 /* Load a function from combase.dll */
 void *WIN_LoadComBaseFunction(const char *name);
 #endif