re PR c/62059 (signed integer overflow in diagnostic.c adjust_line)

	PR c/62059
	* diagnostic.c (adjust_line): Add gcc_checking_assert.
	(diagnostic_show_locus): Don't print caret diagnostic
	if a column is larger than the line_width.

Co-Authored-By: Manuel López-Ibáñez <manu@gcc.gnu.org>

From-SVN: r214074

gcc/ChangeLog

+2014-08-17  Marek Polacek  <polacek@redhat.com>
+	    Manuel López-Ibáñez  <manu@gcc.gnu.org>
+
+	PR c/62059
+	* diagnostic.c (adjust_line): Add gcc_checking_assert.
+	(diagnostic_show_locus): Don't print caret diagnostic
+	if a column is larger than the line_width.
+
 2014-08-17 Roman Gareev  <gareevroman@gmail.com>
 
 	* common.opt: Make the ISL AST generator to be the main code generator

gcc/diagnostic.c

@@ -268,6 +268,7 @@ adjust_line (const char *line, int line_width,
   int right_margin = 10;
   int column = *column_p;
 
+  gcc_checking_assert (line_width >= column);
   right_margin = MIN (line_width - column, right_margin);
   right_margin = max_width - right_margin;
   if (line_width >= max_width && column > right_margin)
@@ -300,7 +301,7 @@ diagnostic_show_locus (diagnostic_context * context,
   context->last_location = diagnostic->location;
   s = expand_location_to_spelling_point (diagnostic->location);
   line = location_get_source_line (s, &line_width);
-  if (line == NULL)
+  if (line == NULL || s.column > line_width)
     return;
 
   max_width = context->caret_max_width;