On OS/2 GCC 3.03 is required to build applications for the XFree86/OS2 X-Server and Gtk+. But this compiler is to date not supported in the header files. Support
is easy and implemented by myself. For future use it is needed to overtake my
adds to the main developement tree.

This is my modified begin_code.h header file with support for GCC 3.03. My
changes are marked with ##:

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

/* This file sets things up for C dynamic library function definitions,
   static inlined functions, and structures aligned at 4-byte alignment.
   If you don't like ugly C preprocessor code, don't look at this file. :)
*/

/* This shouldn't be nested -- included it around code only. */
#ifdef _begin_code_h
#error Nested inclusion of begin_code.h
#endif
#define _begin_code_h

/* Some compilers use a special export keyword */
#ifndef DECLSPEC
# if defined(__BEOS__)
#  if defined(__GNUC__)
#   define DECLSPEC	__declspec(dllexport)
#  else
#   define DECLSPEC	__declspec(export)
#  endif
# elif defined(__WIN32__)
#  ifdef __BORLANDC__
#   ifdef BUILD_SDL
#    define DECLSPEC 
#   else
#    define DECLSPEC	__declspec(dllimport)
#   endif
#  else
#   define DECLSPEC	__declspec(dllexport)
#  endif

# elif defined(__OS2__)
#  ifdef __WATCOMC__
#   ifdef BUILD_SDL
#    define DECLSPEC	__declspec(dllexport)
#   else
#    define DECLSPEC
#   endif
## elif defined (__GNUC__) && __GNUC__ < 4
##   /* Added support for GCC-EMX <v4.x */
##   /* this is needed for XFree86/OS2 developement */
##   /* F. Ambacher(anakor@snafu.de) 05.2008 */
##  ifdef BUILD_SDL
##   define DECLSPEC	__declspec(dllexport)
##  else
##   define DECLSPEC
##  endif
## else
#   define DECLSPEC
#  endif
# else
#  if defined(__GNUC__) && __GNUC__ >= 4
#   define DECLSPEC	__attribute__ ((visibility("default")))
#  else
#   define DECLSPEC
#  endif
# endif
#endif

/* By default SDL uses the C calling convention */
#ifndef SDLCALL
#  if defined(__WIN32__) && !defined(__GNUC__)
#    define SDLCALL __cdecl
#  else
#  ifdef __OS2__
##   if defined (__GNUC__) && __GNUC__ < 4
##      /* Added support for GCC-EMX <v4.x */
##      /* this is needed for XFree86/OS2 developement */
##      /* F. Ambacher(anakor@snafu.de) 05.2008 */
##     define SDLCALL _cdecl
##   else 
##      /* On other compilers on OS/2, we use the _System calling convention */
##      /* to be compatible with every compiler */
#      define SDLCALL _System
#    endif
#  else
#    define SDLCALL
#  endif
#endif
#endif /* SDLCALL */

/* Removed DECLSPEC on Symbian OS because SDL cannot be a DLL in EPOC */
#ifdef __SYMBIAN32__ 
#undef DECLSPEC
#define DECLSPEC
#endif /* __SYMBIAN32__ */

/* Force structure packing at 4 byte alignment.
   This is necessary if the header is included in code which has structure
   packing set to an alternate value, say for loading structures from disk.
   The packing is reset to the previous value in close_code.h
 */
#if defined(_MSC_VER) || defined(__MWERKS__) || defined(__BORLANDC__)
#ifdef _MSC_VER
#pragma warning(disable: 4103)
#endif
#ifdef __BORLANDC__
#pragma nopackwarning
#endif
#pragma pack(push,4)
#elif (defined(__MWERKS__) && defined(__MACOS__))
#pragma options align=mac68k4byte
#pragma enumsalwaysint on
#endif /* Compiler needs structure packing set */

/* Set up compiler-specific options for inlining functions */
#ifndef SDL_INLINE_OKAY
#ifdef __GNUC__
#define SDL_INLINE_OKAY
#else
/* Add any special compiler-specific cases here */
#if defined(_MSC_VER) || defined(__BORLANDC__) || \
    defined(__DMC__) || defined(__SC__) || \
    defined(__WATCOMC__) || defined(__LCC__) || \
    defined(__DECC)
#ifndef __inline__
#define __inline__	__inline
#endif
#define SDL_INLINE_OKAY
#else
#if !defined(__MRC__) && !defined(_SGI_SOURCE)
#define __inline__ inline
#define SDL_INLINE_OKAY
#endif /* Not a funky compiler */
#endif /* Visual C++ */
#endif /* GNU C */
#endif /* SDL_INLINE_OKAY */

/* If inlining isn't supported, remove "__inline__", turning static
   inlined functions into static functions (resulting in code bloat
   in all files which include the offending header files)
*/
#ifndef SDL_INLINE_OKAY
#define __inline__
#endif

/* Apparently this is needed by several Windows compilers */
#if !defined(__MACH__)
#ifndef NULL
#ifdef __cplusplus
#define NULL 0
#else
#define NULL ((void *)0)
#endif
#endif /* NULL */
#endif /* ! Mac OS X - breaks precompiled headers */