Re: egcs-971031, sparc-sun-solaris2.5 new bootstrap failure

[Jim Wilson <wilson at cygnus dot com>]

Here is a patch to fix this.  This will be in the next snapshot.

Thu Nov  6 18:27:36 1997  Jim Wilson  <wilson@cygnus.com>

	* flags.h (flag_rerun_loop_opt): Declare.
	* loop.c (invariant_p, case LABEL_REF): Check flag_rerun_loop_opt.
	* toplev.c (flag_rerum_loop_opt): Delete static.

diff -pr clean-egcs-971105/gcc/flags.h egcs-971105/gcc/flags.h
*** clean-egcs-971105/gcc/flags.h	Wed Aug 27 20:35:15 1997
--- egcs-971105/gcc/flags.h	Thu Nov  6 17:57:46 1997
*************** extern int flag_volatile_global;
*** 275,280 ****
--- 275,284 ----
  
  extern int flag_fast_math;
  
+ /* Nonzero means to run loop optimizations twice.  */
+ 
+ extern int flag_rerun_loop_opt;
+ 
  /* Nonzero means make functions that look like good inline candidates
     go inline.  */
  
diff -pr clean-egcs-971105/gcc/loop.c egcs-971105/gcc/loop.c
*** clean-egcs-971105/gcc/loop.c	Sun Oct 26 08:20:07 1997
--- egcs-971105/gcc/loop.c	Thu Nov  6 17:54:00 1997
*************** invariant_p (x)
*** 2833,2839 ****
  
  	 We don't know the loop bounds here though, so just fail for all
  	 labels.  */
!       if (flag_unroll_loops)
  	return 0;
        else
  	return 1;
--- 2833,2844 ----
  
  	 We don't know the loop bounds here though, so just fail for all
  	 labels.  */
!       /* ??? This is also necessary if flag_rerun_loop_opt is true, because in
! 	 this case we may be doing loop unrolling the second time we run loop,
! 	 and hence the first loop run also needs this check.  There is no way
! 	 to check here whether the second run will actually do loop unrolling
! 	 though, as that info is in a local var in rest_of_compilation.  */
!       if (flag_unroll_loops || flag_rerun_loop_opt)
  	return 0;
        else
  	return 1;
diff -pr clean-egcs-971105/gcc/toplev.c egcs-971105/gcc/toplev.c
*** clean-egcs-971105/gcc/toplev.c	Sun Oct 26 08:56:15 1997
--- egcs-971105/gcc/toplev.c	Thu Nov  6 17:56:26 1997
*************** static int flag_rerun_cse_after_loop;
*** 507,513 ****
  
  /* Nonzero means to run loop optimizations twice.  */
  
! static int flag_rerun_loop_opt;
  
  /* Nonzero for -finline-functions: ok to inline functions that look like
     good inline candidates.  */
--- 507,513 ----
  
  /* Nonzero means to run loop optimizations twice.  */
  
! int flag_rerun_loop_opt;
  
  /* Nonzero for -finline-functions: ok to inline functions that look like
     good inline candidates.  */