Move similar/arch/sdl/digi.c -> similar/arch/sdl/digi.cpp

SConstruct

@@ -744,7 +744,7 @@ class DXXProgram(DXXCommon):
 '2d/palette.cpp',
 '2d/pcx.cpp',
 '3d/interp.cpp',
-'arch/sdl/digi.c',
+'arch/sdl/digi.cpp',
 'arch/sdl/digi_audio.c',
 'arch/sdl/event.c',
 'arch/sdl/init.c',

common/include/digi_audio.h

@@ -3,6 +3,10 @@
 
 #include "maths.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int digi_audio_init();
 void digi_audio_reset();
 void digi_audio_close();
@@ -17,4 +21,8 @@ void digi_audio_end_sound(int );
 void digi_audio_set_digi_volume(int);
 void digi_audio_debug();
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

common/main/digi.h

@@ -25,6 +25,10 @@ COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
 #include "pstypes.h"
 #include "vecmat.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct digi_sound       {
         int bits;
         int freq;
@@ -127,4 +131,8 @@ void digi_win32_resume_midi_song();
 void digi_win32_stop_midi_song();
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif