http://developer.pidgin.im/ticket/889

I: Program causes undefined operation
   (likely same variable used twiceand post/pre incremented in the same expression).
   e.g. x = x++; Split it in two operations.

gntwm.c: In function 'dump_screen':
gntwm.c:610: warning: operation on 'fgp' may be undefined

--- finch/libgnt/gntwm.c
+++ finch/libgnt/gntwm.c
@@ -607,7 +607,11 @@
 				if (bgp == -1)
 					bgp = COLOR_WHITE;
 				if (now & A_REVERSE)
-					fgp ^= bgp ^= fgp ^= bgp;  /* *wink* */
+				{
+					short tgp = bgp;
+					bgp = fgp;
+					fgp = tgp;
+				}
 				ret = color_content(fgp, &r, &g, &b);
 				fg.r = r; fg.b = b; fg.g = g;
 				ret = color_content(bgp, &r, &g, &b);