From d2097aadcb55963b0702f4dec374ea0f4603fae0 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Sun, 10 Feb 2019 12:44:16 -0500
Subject: [PATCH] Clean up multi-include magic.

---
 src/SDL12_compat.c | 10 +---------
 src/SDL20_syms.h   | 11 +++++++++++
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
index 6d4c56f4f..0275f73d1 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -57,19 +57,15 @@
 #define SDL20_SYM_PASSTHROUGH(rc,fn,params,args,ret) \
     SDL20_SYM(rc,fn,params,args,ret)
 #include "SDL20_syms.h"
-#undef SDL20_SYM_PASSTHROUGH
-#undef SDL20_SYM
 
+/* this doesn't get handled in SDL20_syms.h because it uses varargs. */
 typedef int (SDLCALL *SDL20_SetError_t)(const char *fmt, ...);
 static SDL20_SetError_t SDL20_SetError = NULL;
 
 /* Things that _should_ be binary compatible pass right through... */
-#define SDL20_SYM(rc,fn,params,args,ret)
 #define SDL20_SYM_PASSTHROUGH(rc,fn,params,args,ret) \
     DECLSPEC rc SDLCALL SDL_##fn params { ret SDL20_##fn args; }
 #include "SDL20_syms.h"
-#undef SDL20_SYM_PASSTHROUGH
-#undef SDL20_SYM
 
 
 /* these are macros (etc) in the SDL headers, so make our own. */
@@ -446,8 +442,6 @@ UnloadSDL20(void)
     #define SDL20_SYM(rc,fn,params,args,ret) SDL20_##fn = NULL;
     #define SDL20_SYM_PASSTHROUGH(rc,fn,params,args,ret) SDL20_SYM(rc,fn,params,args,ret)
     #include "SDL20_syms.h"
-    #undef SDL20_SYM_PASSTHROUGH
-    #undef SDL20_SYM
     SDL20_SetError = NULL;
     CloseSDL20Library();
 }
@@ -462,8 +456,6 @@ LoadSDL20(void)
         #define SDL20_SYM(rc,fn,params,args,ret) SDL20_##fn = (SDL20_##fn##_t) LoadSDL20Symbol("SDL_" #fn, &okay);
         #define SDL20_SYM_PASSTHROUGH(rc,fn,params,args,ret) SDL20_SYM(rc,fn,params,args,ret)
         #include "SDL20_syms.h"
-        #undef SDL20_SYM_PASSTHROUGH
-        #undef SDL20_SYM
         SDL20_SetError = (SDL20_SetError_t) LoadSDL20Symbol("SDL_SetError", &okay);
         if (!okay)
             UnloadSDL20();
diff --git a/src/SDL20_syms.h b/src/SDL20_syms.h
index 679d9ae81..8eaeda22d 100644
--- a/src/SDL20_syms.h
+++ b/src/SDL20_syms.h
@@ -21,6 +21,14 @@
 
 /* don't #pragma once this file, it gets #included multiple times! */
 
+#ifndef SDL20_SYM
+#define SDL20_SYM(rc,fn,params,args,ret)
+#endif
+
+#ifndef SDL20_SYM_PASSTHROUGH
+#define SDL20_SYM_PASSTHROUGH(rc,fn,params,args,ret)
+#endif
+
 SDL20_SYM(int,Init,(Uint32 a),(a),return)
 SDL20_SYM(int,InitSubSystem,(Uint32 a),(a),return)
 SDL20_SYM(Uint32,WasInit,(Uint32 a),(a),return)
@@ -224,5 +232,8 @@ SDL20_SYM_PASSTHROUGH(char *,iconv_string,(const char *a, const char *b, const c
 SDL20_SYM(int,setenv,(const char *a, const char *b, int c),(a,b,c),return)
 SDL20_SYM(int,atoi,(const char *a),(a),return)
 
+#undef SDL20_SYM
+#undef SDL20_SYM_PASSTHROUGH
+
 /* vi: set ts=4 sw=4 expandtab: */