[AD] Inline functions and C++

["Eric Botcazou" <ebotcazou@xxxxxxxxxx>]

Following the thread on [AL] (mingw C++ not inlining... inline problems)
dated 05/06, I propose the following fix:

--- cvsroot/allegro/include/allegro/internal/alconfig.h Fri Apr 12 15:45:12 2002
+++ allegro/include/allegro/internal/alconfig.h Wed May  8 10:35:10 2002
@@ -58,7 +58,11 @@
    #define ALLEGRO_GCC

    #ifndef AL_INLINE
-      #define AL_INLINE(type, name, args, code)    extern __inline__ type name args code
+      #ifdef __cplusplus
+         #define AL_INLINE(type, name, args, code)    static inline type name args code
+      #else
+         #define AL_INLINE(type, name, args, code)    extern __inline__ type name args code
+      #endif
    #endif

The problem is, on platforms which don't support weak symbols, G++ produces
a strong global symbol for functions declared with 'extern __inline__' when
no optimization is used. This symbol can conflict with the one imported from
inline.o when C and C++ source files are mixed.

I had originally intended to put the fix in almingw32.h, but then I
remembered that Darwin doesn't support weak symbols too, hence
the new location.

Tested under DJGPP, Mingw32, Linux and QNX.

--
Eric Botcazou
ebotcazou@xxxxxxxxxx