(process_command): Delete code modifying gcc_exec_prefix.

(main): Put it here after last use of gcc_exec_prefix.  For cross
compiler, set startfile_prefixes if gcc_exec_prefix is set and
standard_startfile_prefix is a relative path.

From-SVN: r9253

gcc/gcc.c

@@ -3048,19 +3048,6 @@ process_command (argc, argv)
 
   switches[n_switches].part1 = 0;
   infiles[n_infiles].name = 0;
-
-  /* If we have a GCC_EXEC_PREFIX envvar, modify it for cpp's sake.  */
-  if (gcc_exec_prefix)
-    {
-      temp = (char *) xmalloc (strlen (gcc_exec_prefix) + strlen (spec_version)
-			       + strlen (spec_machine) + 3);
-      strcpy (temp, gcc_exec_prefix);
-      strcat (temp, spec_machine);
-      strcat (temp, dir_separator_str);
-      strcat (temp, spec_version);
-      strcat (temp, dir_separator_str);
-      gcc_exec_prefix = temp;
-    }
 }
 
 /* Process a spec string, accumulating and running commands.  */
@@ -4447,6 +4434,27 @@ main (argc, argv)
       add_prefix (&startfile_prefixes, "./", 0, 1, NULL_PTR);
 #endif
     }
+  else
+    {
+      if (*standard_startfile_prefix != DIR_SEPARATOR && gcc_exec_prefix)
+	add_prefix (&startfile_prefixes,
+		    concat (gcc_exec_prefix, standard_startfile_prefix),
+		    0, 0, NULL_PTR);
+    }
+
+  /* If we have a GCC_EXEC_PREFIX envvar, modify it for cpp's sake.  */
+  if (gcc_exec_prefix)
+    {
+      char * temp = (char *) xmalloc (strlen (gcc_exec_prefix)
+				      + strlen (spec_version)
+				      + strlen (spec_machine) + 3);
+      strcpy (temp, gcc_exec_prefix);
+      strcat (temp, spec_machine);
+      strcat (temp, dir_separator_str);
+      strcat (temp, spec_version);
+      strcat (temp, dir_separator_str);
+      gcc_exec_prefix = temp;
+    }
 
   /* Now we have the specs.
      Set the `valid' bits for switches that match anything in any spec.  */