The gcse.c patch fixes an optimization problem.  This is probably not the right
solution, but it was quick.  I will replace with a better solution later.

The libio/libstdc++ patches are useful if you have a version of glibc without
thread support.  There is no official ia64 glibc version yet, and some of the
unofficial ones in common use are missing thread support.  libio/libstdc++
assume that glibc always has thread support, so we need to patch them until
the official ia64 glibc is available.

Index: gcc/gcse.c
===================================================================
RCS file: /cvs/cvsfiles/devo/gcc/gcse.c,v
retrieving revision 1.87
diff -p -r1.87 gcse.c
*** gcse.c	2000/01/11 14:59:28	1.87
--- gcse.c	2000/02/16 04:17:06
*************** try_replace_reg (from, to, insn)
*** 4039,4045 ****
       information.  */
    if (!success && !note)
      {
!       if (!set)
  	return 0;
        note = REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL,
  						   copy_rtx (SET_SRC (set)),
--- 4039,4048 ----
       information.  */
    if (!success && !note)
      {
!       /* Don't add a REG_EQUAL note for a CCmode destination, because this
! 	 confuses the code in cse.c that simplifies compare and branch
! 	 instructions.  */
!       if (!set || GET_MODE_CLASS (GET_MODE (SET_DEST (set))) == MODE_CC)
  	return 0;
        note = REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EQUAL,
  						   copy_rtx (SET_SRC (set)),
Index: libio/configure.in
===================================================================
RCS file: /cvs/cvsfiles/devo/libio/configure.in,v
retrieving revision 1.57
diff -p -r1.57 configure.in
*** configure.in	1999/10/26 03:42:26	1.57
--- configure.in	2000/02/16 04:17:56
*************** case "${target}" in
*** 57,62 ****
--- 57,64 ----
  		 frags="linux.mt linuxaxp1.mt mtsafe.mt" ;;
    *-linux-gnulibc1)
  		 frags=linuxlibc1.mt ;;
+   # ??? glibc does not have thread support yet, so we can't use mtsafe.mt.
+   ia64*-linux-gnu) frags="linux.mt" ;;
    *-linux-gnu)   frags="linux.mt mtsafe.mt" ;;
    *-sco3.2v[45]*)   frags=sco4.mt ;;
    *-isc*)        frags=isc.mt ;;
Index: libstdc++/configure.in
===================================================================
RCS file: /cvs/cvsfiles/devo/libstdc++/configure.in,v
retrieving revision 1.46
diff -p -r1.46 configure.in
*** configure.in	1999/09/21 19:26:16	1.46
--- configure.in	2000/02/16 04:17:57
*************** fi
*** 89,94 ****
--- 89,96 ----
  case "${target}" in
    alpha*-*-linux-gnulibc1)	frags="${frags} linux.mt" ;;
    powerpc*-*-linux-gnulibc1)	frags="${frags} linux.mt" ;;
+   # ??? ia64 glibc port does not have thread support yet.
+   ia64*-*-linux-gnu)		;;
    *-*-linux-gnu)		frags="${frags} linux.mt" ;;
    *-*-openbsd*)		
    	case "x${enable_threads}" in
Index: libstdc++/stl/stl_config.h
===================================================================
RCS file: /cvs/cvsfiles/devo/libstdc++/stl/stl_config.h,v
retrieving revision 1.17
diff -p -r1.17 stl_config.h
*** stl_config.h	1999/12/24 16:21:31	1.17
--- stl_config.h	2000/02/16 04:17:58
***************
*** 168,174 ****
  #   if defined(__linux__)
       /* glibc pre 2.0 is very buggy. We have to disable thread for it.
          It should be upgraded to glibc 2.0 or later. */
! #    if !defined(_NOTHREADS) && __GLIBC__ >= 2 && defined(_G_USING_THUNKS)
  #      define __STL_PTHREADS
  #      ifdef __STRICT_ANSI__
           /* Work around a bug in the glibc 2.0.x pthread.h.  */
--- 168,175 ----
  #   if defined(__linux__)
       /* glibc pre 2.0 is very buggy. We have to disable thread for it.
          It should be upgraded to glibc 2.0 or later. */
!      /* ??? ia64 glibc port does not have thread support yet.  */
! #    if !defined(_NOTHREADS) && __GLIBC__ >= 2 && defined(_G_USING_THUNKS) && !defined(__ia64__)
  #      define __STL_PTHREADS
  #      ifdef __STRICT_ANSI__
           /* Work around a bug in the glibc 2.0.x pthread.h.  */