From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 5 Apr 2011 20:22:53 +0000 (-0700)
Subject: * fns.c (Fstring_to_unibyte): Don't rely on undefined behavior
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* fns.c (Fstring_to_unibyte): Don't rely on undefined behavior

by passing a long int to a printf format expecting an int.
---

diff --git a/src/ChangeLog b/src/ChangeLog
index f65c528b3a2..a822b31f688 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -2,6 +2,9 @@
 
 	Fix more problems found by GCC 4.6.0's static checks.
 
+	* fns.c (Fstring_to_unibyte): Don't rely on undefined behavior
+	by passing a long int to a printf format expecting an int.
+
 	* lisp.h (message, message_nolog, doprint, error, verror, fatal):
 	Mark as printf-like functions.
 
diff --git a/src/fns.c b/src/fns.c
index c45d9e31ef2..ca18dbfc100 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -1076,7 +1076,10 @@ an error is signaled.  */)
       EMACS_INT converted = str_to_unibyte (SDATA (string), str, chars, 0);
 
       if (converted < chars)
-	error ("Can't convert the %dth character to unibyte", converted);
+	{
+	  long lconverted = converted;
+	  error ("Can't convert the %ldth character to unibyte", lconverted);
+	}
       string = make_unibyte_string ((char *) str, chars);
       xfree (str);
     }