PR preprocessor/59935 - caret diagnostics crashes on non-file locations

gcc/ChangeLog

	* input.c (location_get_source_line): Bail out on when line number
	is zero, and test the return value of
	lookup_or_add_file_to_cache_tab.

gcc/testsuite/ChangeLog

	* c-c++-common/cpp/warning-zero-location.c: New test.
	* c-c++-common/cpp/warning-zero-location-2.c: Likewise.

Signed-off-by: Dodji Seketeli <dodji@seketeli.org>

From-SVN: r207195

gcc/ChangeLog

+2014-01-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR preprocessor/59935
+	* input.c (location_get_source_line): Bail out on when line number
+	is zero, and test the return value of
+	lookup_or_add_file_to_cache_tab.
+
 2014-01-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/58742

gcc/input.c

@@ -698,7 +698,13 @@ location_get_source_line (expanded_location xloc,
   static char *buffer;
   static ssize_t len;
 
-  fcache * c = lookup_or_add_file_to_cache_tab (xloc.file);
+  if (xloc.line == 0)
+    return NULL;
+
+  fcache *c = lookup_or_add_file_to_cache_tab (xloc.file);
+  if (c == NULL)
+    return NULL;
+
   bool read = read_line_num (c, xloc.line, &buffer, &len);
 
   if (read && line_len)

gcc/testsuite/ChangeLog

+2014-01-28  Dodji Seketeli  <dodji@redhat.com>
+
+	PR preprocessor/59935
+	* c-c++-common/cpp/warning-zero-location.c: New test.
+	* c-c++-common/cpp/warning-zero-location-2.c: Likewise.
+
 2014-01-27  Steve Ellcey  <sellcey@mips.com>
 
 	* gcc.target/mips/pr52125.c: Add -mno-optgp option.

gcc/testsuite/c-c++-common/cpp/warning-zero-location-2.c

+/*
+   { dg-options "-D _GNU_SOURCE -fdiagnostics-show-caret" }
+   { dg-do compile }
+ */
+
+#line 4636 "configure"
+#include <xxxxxxxxxxxx.h>
+int main() { return 0; }
+
+/* { dg-error "No such file or directory" { target *-*-* } 4636 } */

gcc/testsuite/c-c++-common/cpp/warning-zero-location.c

+/*
+   { dg-options "-D _GNU_SOURCE -fdiagnostics-show-caret" }
+   { dg-do compile }
+ */
+
+#define _GNU_SOURCE 	/* { dg-warning "redefined" } */
+
+/* { dg-message "" "#define _GNU_SOURCE" {target *-*-* } 0 }