re PR middle-end/66345 (internal compiler error: Segmentation fault)

	PR middle-end/66345
	* gimple-fold.c (gimple_fold_builtin_snprintf): Return false if
	get_maxval_strlen does not produce an INTEGER_CST.

	* gcc.dg/torture/pr66345.c: New test.

From-SVN: r224016

gcc/ChangeLog

+2015-06-02  Marek Polacek  <polacek@redhat.com>
+
+	PR middle-end/66345
+	* gimple-fold.c (gimple_fold_builtin_snprintf): Return false if
+	get_maxval_strlen does not produce an INTEGER_CST.
+
 2015-06-02  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* config/arc/constraints.md: Use lower-case names in match_code.

gcc/gimple-fold.c

@@ -2530,7 +2530,7 @@ gimple_fold_builtin_snprintf (gimple_stmt_iterator *gsi)
 	return false;
 
       tree orig_len = get_maxval_strlen (orig, 0);
-      if (!orig_len)
+      if (!orig_len || TREE_CODE (orig_len) != INTEGER_CST)
 	return false;
 
       /* We could expand this as

gcc/testsuite/ChangeLog

+2015-06-02  Marek Polacek  <polacek@redhat.com>
+
+	PR middle-end/66345
+	* gcc.dg/torture/pr66345.c: New test.
+
 2015-06-02  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/65961

gcc/testsuite/gcc.dg/torture/pr66345.c

+/* { dg-do compile } */
+
+extern int snprintf (char *, unsigned long, const char *, ...);
+const char a[] = "";
+int b;
+void
+get_bar ()
+{
+  snprintf (0, 0, "%s", &a[b]);
+}