re PR driver/43335 (Driver crashes dereferencing a null pointer if it can't find lto-wrapper)

2010-11-22  Dmitry Gorbachev  <d.g.gorbachev@gmail.com>

	PR driver/43335
	* gcc.c (main): Don't crash when lto-wrapper program is not found.

From-SVN: r167052

gcc/ChangeLog

+2010-11-22  Dmitry Gorbachev  <d.g.gorbachev@gmail.com>
+
+	PR driver/43335
+	* gcc.c (main): Don't crash when lto-wrapper program is not found.
+
 2010-11-22  Joern Rennecke  <amylaar@spamcop.net>
 
 	PR target/46608

gcc/gcc.c

@@ -6074,6 +6074,7 @@ main (int argc, char **argv)
   int num_linker_inputs = 0;
   char *explicit_link_files;
   char *specs_file;
+  char *lto_wrapper_file;
   const char *p;
   struct user_specs *uptr;
   char **old_argv = argv;
@@ -6412,9 +6413,10 @@ main (int argc, char **argv)
 
   /* Set up to remember the pathname of the lto wrapper. */
 
-  lto_wrapper_spec = find_a_file (&exec_prefixes, "lto-wrapper", X_OK, false);
-  if (lto_wrapper_spec)
+  lto_wrapper_file = find_a_file (&exec_prefixes, "lto-wrapper", X_OK, false);
+  if (lto_wrapper_file)
     {
+      lto_wrapper_spec = lto_wrapper_file;
       obstack_init (&collect_obstack);
       obstack_grow (&collect_obstack, "COLLECT_LTO_WRAPPER=",
 		    sizeof ("COLLECT_LTO_WRAPPER=") - 1);