change 'max' macro to be GNU C++ compatible

diff --git a/msgbox.c b/msgbox.c
index acd1773bbda552acf8f9a5c7c9de1521958ca5c8..5dbaab9948468d8b3eb4faf5d0e5b61880b1dd7e 100644 (file)
--- a/msgbox.c
+++ b/msgbox.c
@@ -12,9 +12,10 @@
 #include "pngw.h"
 
 
-#define max(a,b) ( \
-    { __auto_type __a = (a); __auto_type __b = (b); \
-      __a > __b ? __a : __b; })
+#define max(a,b) ({ \
+       typeof (a) __a = (a); \
+       typeof (b) __b = (b); \
+       __a > __b ? __a : __b; })
 
 #define M_VERSION 2.0