re PR preprocessor/37215 (ICE on 'gcc -E -dM -fpreprocessed - < /dev/null')

        PR preprocessor/37215
        * c-ppoutput.c (preprocess_file): Check for nonempty buffer.

From-SVN: r189016

gcc/c-family/ChangeLog

+2012-06-27  Kai Tietz  <ktietz@redhat.com>
+
+	PR preprocessor/37215
+	* c-ppoutput.c (preprocess_file): Check for nonempty buffer.
+
 2012-06-21  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* c-common.h (c_common_print_pch_checksum): Remove.

gcc/c-family/c-ppoutput.c

@@ -86,7 +86,7 @@ preprocess_file (cpp_reader *pfile)
 {
   /* A successful cpp_read_main_file guarantees that we can call
      cpp_scan_nooutput or cpp_get_token next.  */
-  if (flag_no_output)
+  if (flag_no_output && pfile->buffer)
     {
       /* Scan -included buffers, then the main file.  */
       while (pfile->buffer->prev)