re PR driver/36312 (should refuse to overwrite input file with output file)

	PR driver/36312
	PR driver/63837
	* gcc.c (process_command): Don't check for input/output
	filename equality if output is HOST_BIT_BUCKET.
	* toplev.c (init_asm_output): Likewise.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r217789

gcc/ChangeLog

+2014-11-19  Manuel López-Ibáñez  <manu@gcc.gnu.org>
+	    Jakub Jelinek  <jakub@redhat.com>
+
+	PR driver/36312
+	PR driver/63837
+	* gcc.c (process_command): Don't check for input/output
+	filename equality if output is HOST_BIT_BUCKET.
+	* toplev.c (init_asm_output): Likewise.
+
 2014-11-19  David Malcolm  <dmalcolm@redhat.com>
 
 	Merger of git branch "gimple-classes-v2-option-3".

gcc/gcc.c

@@ -4155,7 +4155,9 @@ process_command (unsigned int decoded_options_count,
 			   CL_DRIVER, &handlers, global_dc);
     }
 
-  if (output_file && strcmp (output_file, "-"))
+  if (output_file
+      && strcmp (output_file, "-") != 0
+      && strcmp (output_file, HOST_BIT_BUCKET) != 0)
     {
       int i;
       for (i = 0; i < n_infiles; i++)

gcc/toplev.c

@@ -945,7 +945,8 @@ init_asm_output (const char *name)
 	}
       if (!strcmp (asm_file_name, "-"))
 	asm_out_file = stdout;
-      else if (!canonical_filename_eq (asm_file_name, name))
+      else if (!canonical_filename_eq (asm_file_name, name)
+	       || !strcmp (asm_file_name, HOST_BIT_BUCKET))
 	asm_out_file = fopen (asm_file_name, "w");
       else
 	/* Use fatal_error (UNKOWN_LOCATION) instead of just fatal_error to