Fix regression 2722

[Nathan Sidwell]

Hi,
I've installed this obvious patch which Jakub posted a while back
plus a tweak of my own to make things more obvious.

built & tested on i686-pc-linux-gnu. Installed on both branch and
mainline

nathan
-- 
Dr Nathan Sidwell   ::   http://www.codesourcery.com   ::   CodeSourcery LLC
         'But that's a lie.' - 'Yes it is. What's your point?'
nathan@codesourcery.com : http://www.cs.bris.ac.uk/~nathan/ : nathan@acm.org
2001-05-16  Jakub Jelinek  <jakub@redhat.com>
	    Nathan Sidwell  <nathan@codesourcery.com>
	    
        * gcc.c (give_switch): Don't write before start of string.
	Always append suffix.

Index: gcc.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/gcc.c,v
retrieving revision 1.227
diff -c -3 -p -r1.227 gcc.c
*** gcc.c	2001/05/15 01:45:10	1.227
--- gcc.c	2001/05/16 09:58:10
*************** give_switch (switchnum, omit_first_word,
*** 5289,5307 ****
  	  if (suffix_subst)
  	    {
  	      unsigned length = strlen (arg);
  
  	      while (length-- && !IS_DIR_SEPARATOR (arg[length]))
  		if (arg[length] == '.')
  		  {
  		    ((char *)arg)[length] = 0;
  		    break;
  		  }
  	      do_spec_1 (arg, 1, NULL);
! 	      if (!arg[length])
! 		{
! 		  ((char *)arg)[length] = '.';
! 		  do_spec_1 (suffix_subst, 1, NULL);
! 		}
  	    }
  	  else
  	    do_spec_1 (arg, 1, NULL);
--- 5289,5307 ----
  	  if (suffix_subst)
  	    {
  	      unsigned length = strlen (arg);
+ 	      int dot = 0;
  
  	      while (length-- && !IS_DIR_SEPARATOR (arg[length]))
  		if (arg[length] == '.')
  		  {
  		    ((char *)arg)[length] = 0;
+ 		    dot = 1;
  		    break;
  		  }
  	      do_spec_1 (arg, 1, NULL);
! 	      if (dot)
! 		((char *)arg)[length] = '.';
! 	      do_spec_1 (suffix_subst, 1, NULL);
  	    }
  	  else
  	    do_spec_1 (arg, 1, NULL);