g++ -O2 creates a bug by optimising:
   printf("%s\n", foo) -> puts(foo)

> g++ -O2
> LC_ALL=moo ./xclannad
segfault in puts()

> g++ -O0
> LC_ALL=moo ./xclannad
(null)

Adding another bit of text (eg "Locale: ") stops this optimisation

--- /home/shish/src/key/clean/xclannad/xlovesys.cc	2005-04-14 04:39:10.547563680 +0100
+++ /home/shish/src/key/shish/xclannad/xlovesys.cc	2005-04-14 05:41:06.560643824 +0100
@@ -4,8 +4,6 @@
 	/* kochi-mincho-subst.ttf あるいは -*-*-*-r-*--24-*-*-*-*-*-jisx0208.1983-* など */
 	/* TrueType Font は /usr/X11R6/lib/X11/fonts/TrueType/ などに存在する必要がある */
 
-extern void SetFont(const char* font);
-
 #include<stdio.h>
 #include<stdlib.h>
 #include<unistd.h>
@@ -77,7 +75,13 @@
 	}
 	if(end == 1) return 0;
 
-	printf("%s\n",setlocale(LC_ALL,""));
+	printf("Settings:\n");
+	printf("  Locale    : %s\n", setlocale(LC_ALL, ""));
+	printf("  Root Path : %s\n", rootPath);
+	printf("  Font      : %s\n", font);
+	printf("  CD-ROM    : %s\n", cdromDevice);
+	printf("\n");
+	
 	file_searcher.InitRoot(rootPath);
 	config.LoadInitFile();