-m64 fixed on Solaris 2.7 !!

[Igor Schein <igor at txc dot com>]

Hi,

I finally figured out how to reactivate capability to build 64bit
binaries on Solaris 2.7.  There're 2 things.  First, here's the key
line:  

% sed -n 3108p gcc/config.gcc
# At the moment, 32-to-64 cross compilation doesn't work.

The whole section below it is commented out.  Someone observed that
building dual-arch compiler fails and disabled it altogether.  So I
went back and eventually found this:

revision 1.7883
date: 2000/09/26 14:14:31;  author: jakub;  state: Exp;  lines: +8 -0
        * config/sparc/sparc.c (sparc_emit_set_const64): Don't abort when
        op0 is a SUBREG.
        (function_arg_slotno): Accept TImode/CTImode.
        * config/sparc/sparc.h (MIN_UNITS_PER_WORD): If IN_LIBGCC2 define
        to UNITS_PER_WORD.

This is the change which started failing bootstrap in the first place.
Reverting it enabled me to build a working 64-bit gcc-2.97 compiler.
Attached is the patch which summarized the above changes required to
hack things into working ( applicable to the current tree ).  However,
I'd greatly appreciate if Jakub could find some time at some point to
review his Sep 26 change and adjust it to properly re-enable 64bit
compiling in the main tree,since I'm not qualified to do that.  I'm
sure I'm not alone in asking this.  

Thanks

Igor
Index: gcc/config.gcc
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config.gcc,v
retrieving revision 1.15
diff -u -r1.15 config.gcc
--- gcc/config.gcc	2000/12/18 23:58:15	1.15
+++ gcc/config.gcc	2000/12/31 05:21:36
@@ -3106,18 +3106,18 @@
 	xmake_file=sparc/x-sysv4
 	extra_parts="crt1.o crti.o crtn.o gcrt1.o gmon.o crtbegin.o crtend.o"
 # At the moment, 32-to-64 cross compilation doesn't work.
-#	case $machine in
-#	*-*-solaris2.[0-6] | *-*-solaris2.[0-6].*) ;;
-#	*-*-solaris2*)
-#		if test x$gnu_ld = xyes
-#		then
-#			tm_file=sparc/sol2-64.h
-#		else
-#			tm_file=sparc/sol2-sld-64.h
-#		fi
-#		tmake_file="$tmake_file sparc/t-sol2-64"
-#		;;
-#	esac
+ 	case $machine in
+ 	*-*-solaris2.[0-6] | *-*-solaris2.[0-6].*) ;;
+ 	*-*-solaris2*)
+ 		if test x$gnu_ld = xyes
+ 		then
+ 			tm_file=sparc/sol2-64.h
+ 		else
+ 			tm_file=sparc/sol2-sld-64.h
+ 		fi
+ 		tmake_file="$tmake_file sparc/t-sol2-64"
+ 		;;
+ 	esac
 	case $machine in
 	*-*-solaris2.[0-4])
 		float_format=i128
Index: gcc/config/sparc/sparc.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/sparc/sparc.c,v
retrieving revision 1.127
retrieving revision 1.126
diff -u -r1.127 -r1.126
--- gcc/config/sparc/sparc.c	2000/09/26 14:14:34	1.127
+++ gcc/config/sparc/sparc.c	2000/08/24 20:31:35	1.126
@@ -1832,17 +1832,12 @@
   rtx temp;
 
   /* Sanity check that we know what we are working with.  */
-  if (! TARGET_ARCH64)
+  if (! TARGET_ARCH64
+      || GET_CODE (op0) != REG
+      || (REGNO (op0) >= SPARC_FIRST_FP_REG
+	  && REGNO (op0) <= SPARC_LAST_V9_FP_REG))
     abort ();
 
-  if (GET_CODE (op0) != SUBREG)
-    {
-      if (GET_CODE (op0) != REG
-	  || (REGNO (op0) >= SPARC_FIRST_FP_REG
-	      && REGNO (op0) <= SPARC_LAST_V9_FP_REG))
-	abort ();
-    }
-
   if (reload_in_progress || reload_completed)
     temp = op0;
   else
@@ -3976,7 +3971,6 @@
     case HImode : case CHImode :
     case SImode : case CSImode :
     case DImode : case CDImode :
-    case TImode : case CTImode :
       if (slotno >= SPARC_INT_ARG_MAX)
 	return -1;
       regno = regbase + slotno;
Index: gcc/config/sparc/sparc.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/sparc/sparc.h,v
retrieving revision 1.119
retrieving revision 1.118
diff -u -r1.119 -r1.118
--- gcc/config/sparc/sparc.h	2000/09/26 14:14:34	1.119
+++ gcc/config/sparc/sparc.h	2000/09/25 13:39:45	1.118
@@ -765,11 +765,7 @@
 
 /* Width of a word, in units (bytes).  */
 #define UNITS_PER_WORD		(TARGET_ARCH64 ? 8 : 4)
-#ifdef IN_LIBGCC2
-#define MIN_UNITS_PER_WORD	UNITS_PER_WORD
-#else
 #define MIN_UNITS_PER_WORD	4
-#endif
 
 /* Now define the sizes of the C data types.  */