Re: BROKEN_LDEXP - still useful?

["Zack Weinberg" <zackw at Stanford dot EDU>]

On Fri, May 04, 2001 at 08:59:24PM -0500, Robert Lipe wrote:
> > If the platform is considered dead, maybe I should just rip out the
> > entire infrastructure for it, and BROKEN_LDEXP too...
> 
> In the absence of an active maintainer of that target, I'll assume that
> it falls under my "SCO OS maintainer" badge and would promptly rubber
> stamp an approval on a patch that removed 3.2v2, 3.2v4 or anything else
> before 3.2v5 in that triple.   

Here y'go.  I removed i?86-*-sco3.2v4* and i?86-*-sco* which sets up
an even older set of configuration parameters.

I'm now wondering how many old SVR3-based systems we are still
carrying around baggage for when they're thoroughly dead.  These are
the configuration triples that reference headers with 'svr3' in their
names, directly or indirectly:

clipper-intergraph-clix*
i860-*-osf*
i860-*-sysv3*
i?86-*-isc*
i?86-*-lynxos*
i?86-*-sysv*
i?86-ibm-aix*
m68k-*-lynxos*
m68k-*-sysv*
m88k-*-*	# maybe - it's confusing
mcore-*-pe*
mips-*-riscos*sysv*
mips-*-sysv*
rs6000-*-lynxos*
sparc-*-lynxos*
sparclite-*-coff*

This may have false positives or negatives, since svr3-ness and
coff-ness are confused more or less everywhere.

-- 
zw  Patrick, being from a culture that has embraced scientific rationality
    _as a way to settle arguments_, naturally conflates 'true' and 'factual',
    where factual means 'measured; agreed on by means independent of any
    specific person'.
    	-- Graydon Saunders

	* config.gcc (i[34567]86-*-sco3.2v4*, i[34567]86-*-sco*):
	Delete stanzas.
	* config/i386/sco.h, config/i386/sco4.h, config/i386/scodbx.h,
	config/i386/sco4dbx.h, config/i386/x-sco4: Delete file.

	* optabs.c: Delete #ifdef BROKEN_LDEXP block.

===================================================================
Index: config.gcc
--- config.gcc	2001/05/03 19:32:51	1.58
+++ config.gcc	2001/05/07 19:26:53
@@ -1186,41 +1186,6 @@ i[34567]86-*-sco3.2v5*)	# 80386 running 
 	tmake_file="$tmake_file i386/t-i386bare"
 	extra_parts="crti.o crtbegin.o crtend.o crtbeginS.o crtendS.o"
 	;;
-i[34567]86-*-sco3.2v4*) 	# 80386 running SCO 3.2v4 system
-	xm_defines="POSIX BROKEN_LDEXP SMALL_ARG_MAX"
-	xmake_file=i386/x-sco4
-	install_headers_dir=install-headers-cpio
-        if test x$stabs = xyes
-	then
-		tm_file=i386/sco4dbx.h
-		tmake_file=i386/t-svr3dbx
-		extra_parts="svr3.ifile svr3z.rfile"
-	else
-		tm_file=i386/sco4.h
-		tmake_file=i386/t-crtstuff
-		extra_parts="crtbegin.o crtend.o"
-	fi
-	tmake_file="$tmake_file i386/t-i386bare"
-	# The default EAFS filesystem supports long file names.
-	# Truncating the target makes $host != $target which
-	# makes gcc think it is doing a cross-compile.
-	# truncate_target=yes
-	;;
-i[34567]86-*-sco*)	 	# 80386 running SCO system
-	install_headers_dir=install-headers-cpio
-        if test x$stabs = xyes
-	then
-		tm_file=i386/scodbx.h
-		tmake_file=i386/t-svr3dbx
-		extra_parts="svr3.ifile svr3z.rfile"
-	else
-		tm_file=i386/sco.h
-		extra_parts="crtbegin.o crtend.o"
-		tmake_file=i386/t-crtstuff
-	fi
-	tmake_file="$tmake_file i386/t-i386bare"
-	truncate_target=yes
-	;;
 i[34567]86-*-solaris2*)
 	xm_defines="POSIX SMALL_ARG_MAX"
 	tm_file=i386/sol2.h
===================================================================
Index: config/i386/sco.h
--- config/i386/sco.h	Mon May  7 12:27:33 2001
+++ config/i386/sco.h	Tue May  5 13:32:27 1998
@@ -1,114 +0,0 @@
-/* Definitions for Intel 386 running SCO Unix System V.
-   Copyright (C) 1988, 1992, 1994, 1995, 1996, 1999 
-   Free Software Foundation, Inc.
-
-This file is part of GNU CC.
-
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
-
-/* Mostly it's like AT&T Unix System V. */
-
-#include "i386/sysv3.h"
-
-/* By default, target has a 80387, uses IEEE compatible arithmetic,
-   and returns float values in the 387, ie,
-   (TARGET_80387 | TARGET_FLOAT_RETURNS_IN_80387)
-
-   SCO's software emulation of a 387 fails to handle the `fucomp'
-   opcode.  fucomp is only used when generating IEEE compliant code.
-   So don't make TARGET_IEEE_FP default for SCO. */
-
-#undef TARGET_SUBTARGET_DEFAULT
-#define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_FLOAT_RETURNS)
-
-/* Let's guess that the SCO software FPU emulator can't handle
-   80-bit XFmode insns, so don't generate them.  */
-#undef LONG_DOUBLE_TYPE_SIZE
-#define LONG_DOUBLE_TYPE_SIZE 64
-
-/* Use crt1.o as a startup file and crtn.o as a closing file.  */
-
-#undef STARTFILE_SPEC
-#define STARTFILE_SPEC \
- "%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}} crtbegin.o%s"
-
-#define ENDFILE_SPEC "crtend.o%s crtn.o%s"
-
-/* Library spec, including SCO international language support. */
-
-#undef LIB_SPEC
-#define LIB_SPEC \
- "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} %{scointl:libintl.a%s} -lc"
-
-/* Specify predefined symbols in preprocessor.  */
-
-#undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-DM_UNIX -DM_I386 -DM_COFF -DM_WORDSWAP -Asystem=svr3"
-
-#undef CPP_SPEC
-#define CPP_SPEC "%(cpp_cpu) %{scointl:-DM_INTERNAT}"
-
-/* This spec is used for telling cpp whether char is signed or not.  */
-
-#undef SIGNED_CHAR_SPEC
-#if DEFAULT_SIGNED_CHAR
-#define SIGNED_CHAR_SPEC \
- "%{funsigned-char:-D__CHAR_UNSIGNED__ -D_CHAR_UNSIGNED}"
-#else
-#define SIGNED_CHAR_SPEC \
- "%{!fsigned-char:-D__CHAR_UNSIGNED__ -D_CHAR_UNSIGNED}"
-#endif
-
-/* Specify the size_t type.  */
-#define SIZE_TYPE "unsigned int"
-
-#if 0 /* Not yet certain whether this is needed.  */
-/* If no 387, use the general regs to return floating values,
-   since this system does not emulate the 80387.  */
-
-#undef VALUE_REGNO
-#define VALUE_REGNO(MODE) \
-  ((TARGET_80387
-     && ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)
-   ? FIRST_FLOAT_REG : 0)
-
-#undef HARD_REGNO_MODE_OK
-#define HARD_REGNO_MODE_OK(REGNO, MODE)					  \
-  ((REGNO) < 2 ? 1							  \
-   : (REGNO) < 4 ? 1							  \
-   : FP_REGNO_P (REGNO) ? ((GET_MODE_CLASS (MODE) == MODE_FLOAT		  \
-                          || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT) \
-                         && TARGET_80387				  \
-                         && GET_MODE_UNIT_SIZE (MODE) <= 8)		  \
-   : (MODE) != QImode)
-#endif
-
-/* caller has to pop the extra argument passed to functions that return
-   structures. */
-
-#undef RETURN_POPS_ARGS
-#define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE)   \
-  ((FUNDECL) && TREE_CODE (FUNDECL) == IDENTIFIER_NODE ? 0	\
-   : (TARGET_RTD						\
-      && (TYPE_ARG_TYPES (FUNTYPE) == 0				\
-	  || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE)))	\
-	      == void_type_node))) ? (SIZE)			\
-   : 0)
-/* On other 386 systems, the last line looks like this:
-   : (aggregate_value_p (TREE_TYPE (FUNTYPE))) ? GET_MODE_SIZE (Pmode) : 0)  */
-
-/* Handle #pragma pack. */
-#define HANDLE_SYSV_PRAGMA
===================================================================
Index: config/i386/sco4.h
--- config/i386/sco4.h	Mon May  7 12:27:33 2001
+++ config/i386/sco4.h	Tue May  5 13:32:27 1998
@@ -1,86 +0,0 @@
-/* Definitions for Intel 386 running SCO Unix System V 3.2 Version 4.
-   Written by Chip Salzenberg.
-   Copyright (C) 1992, 1994 Free Software Foundation, Inc.
-
-This file is part of GNU CC.
-
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
-
-
-/* Mostly it's like earlier SCO UNIX.  */
-
-#include "i386/sco.h"
-
-/* Use crt1.o as a startup file and crtn.o as a closing file.  */
-
-#undef STARTFILE_SPEC
-#define STARTFILE_SPEC \
- "%{scoxpg3:%{p:mcrt1X.o%s}%{!p:crt1X.o%s}} \
-  %{!scoxpg3:\
-   %{posix:%{p:mcrt1P.o%s}%{!p:crt1P.o%s}} \
-   %{!posix:\
-    %{ansi:%{p:mcrt1A.o%s}%{!p:crt1A.o%s}} \
-    %{!ansi:%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}} \
-  crtbegin.o%s"
-
-#undef ENDFILE_SPEC
-#define ENDFILE_SPEC \
- "crtend.o%s \
-  %{scoxpg3:crtnX.o%s} \
-  %{!scoxpg3:\
-   %{posix:crtnP.o%s} \
-   %{!posix:\
-    %{ansi:crtnA.o%s} \
-    %{!ansi:crtn.o%s}}}"
-
-/* Library spec.  */
-
-#undef LIB_SPEC
-#define LIB_SPEC \
- "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} \
- %{scoxpg3:-lcX -lcP -lcA} \
- %{!scoxpg3:\
-  %{posix:-lcP -lcA} \
-  %{!posix:\
-   %{ansi:-lcA} \
-   %{!ansi:%{scointl:-lintl} -lc}}}"
-
-/* Macros, macros everywhere:
-   Specify predefined symbols in preprocessor.  */
-
-#undef CPP_PREDEFINES
-#define CPP_PREDEFINES \
- "-Asystem=svr3"
-
-#undef CPP_SPEC
-#define CPP_SPEC "%(cpp_cpu) \
-  -D_i386 -D_M_I386 -D_M_I86 -D_M_I86SM -D_M_SDATA -D_M_STEXT \
-  -D_unix -D_M_UNIX -D_M_XENIX \
-  -D_M_SYS5 -D_M_SYSV -D_M_SYS3 -D_M_SYSIII \
-  -D_M_COFF -D_M_BITFIELDS -D_M_WORDSWAP \
-  %{scoxpg3:-D_XOPEN_SOURCE -D_STRICT_NAMES} \
-  %{!scoxpg3:%{posix:-D_POSIX_SOURCE -D_STRICT_NAMES}} \
-  %{!scoxpg3:%{!posix:\
-    %{ansi:-D_STRICT_NAMES}%{!ansi:\
-    -Di386 -DM_I386 -DM_I86 -DM_I86SM -DM_SDATA -DM_STEXT \
-    -Dunix -DM_UNIX -DM_XENIX \
-    -DM_SYS5 -DM_SYSV -DM_SYS3 -DM_SYSIII \
-    -DM_COFF -DM_BITFIELDS -DM_WORDSWAP \
-    %{scointl:-D_M_INTERNAT -DM_INTERNAT} \
-    %{traditional:-D_KR -D_SVID -D_NO_PROTOTYPE}}}}"
-
-/* The system headers are C++-aware.  */
-#define NO_IMPLICIT_EXTERN_C
===================================================================
Index: config/i386/sco4dbx.h
--- config/i386/sco4dbx.h	Mon May  7 12:27:33 2001
+++ config/i386/sco4dbx.h	Tue May  5 13:32:27 1998
@@ -1,81 +0,0 @@
-/* Definitions for Intel 386 running SCO Unix System V 3.2 Version 4.s,
-   using dbx-in-coff encapsulation.
-   Copyright (C) 1992 Free Software Foundation, Inc.
-
-This file is part of GNU CC.
-
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
-
-
-/* Mostly it's like earlier SCO UNIX.  */
-
-#include "i386/scodbx.h"
-
-/* Use crt1.o as a startup file and crtn.o as a closing file.  */
-
-#undef STARTFILE_SPEC
-#define STARTFILE_SPEC \
- "%{!r:%{!z:gcc.ifile%s}%{z:gccz.ifile%s}}\
-  %{scoxpg3:%{p:mcrt1X.o%s}%{!p:crt1X.o%s}} \
-  %{!scoxpg3:\
-   %{posix:%{p:mcrt1P.o%s}%{!p:crt1P.o%s}} \
-   %{!posix:\
-    %{ansi:%{p:mcrt1A.o%s}%{!p:crt1A.o%s}} \
-    %{!ansi:%{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}}"
-
-#undef ENDFILE_SPEC
-#define ENDFILE_SPEC \
- "%{scoxpg3:crtnX.o%s} \
-  %{!scoxpg3:\
-   %{posix:crtnP.o%s} \
-   %{!posix:\
-    %{ansi:crtnA.o%s} \
-    %{!ansi:crtn.o%s}}}"
-
-/* Library spec.  */
-
-#undef LIB_SPEC
-#define LIB_SPEC \
- "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} \
- %{scoxpg3:-lcX -lcP -lcA} \
- %{!scoxpg3:\
-  %{posix:-lcP -lcA} \
-  %{!posix:\
-   %{ansi:-lcA} \
-   %{!ansi:%{scointl:-lintl} -lc}}}"
-
-/* Macros, macros everywhere:
-   Specify predefined symbols in preprocessor.  */
-
-#undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dunix -Asystem=svr3"
-
-#undef CPP_SPEC
-#define CPP_SPEC "%(cpp_cpu) \
-  -D_M_I386 -D_M_I86 -D_M_I86SM -D_M_SDATA -D_M_STEXT \
-  -D_M_UNIX -D_M_XENIX \
-  -D_M_SYS5 -D_M_SYSV -D_M_SYS3 -D_M_SYSIII \
-  -D_M_COFF -D_M_BITFIELDS -D_M_WORDSWAP \
-  %{scoxpg3:-D_XOPEN_SOURCE -D_STRICT_NAMES} \
-  %{!scoxpg3:%{posix:-D_POSIX_SOURCE -D_STRICT_NAMES}} \
-  %{!scoxpg3:%{!posix:\
-    %{ansi:-D_STRICT_NAMES}%{!ansi:\
-    -DM_I386 -DM_I86 -DM_I86SM -DM_SDATA -DM_STEXT \
-    -DM_UNIX -DM_XENIX \
-    -DM_SYS5 -DM_SYSV -DM_SYS3 -DM_SYSIII \
-    -DM_COFF -DM_BITFIELDS -DM_WORDSWAP \
-    %{scointl:-D_M_INTERNAT -DM_INTERNAT} \
-    %{traditional:-D_KR -D_SVID -D_NO_PROTOTYPE}}}}"
===================================================================
Index: config/i386/scodbx.h
--- config/i386/scodbx.h	Mon May  7 12:27:33 2001
+++ config/i386/scodbx.h	Tue May  5 13:32:27 1998
@@ -1,88 +0,0 @@
-/* Definitions for Intel 386 running SCO Unix System V,
-   using dbx-in-coff encapsulation.
-   Copyright (C) 1992, 1995, 1996, 1999 Free Software Foundation, Inc.
-
-This file is part of GNU CC.
-
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
-
-#include "i386/svr3dbx.h"
-
-/* Overridden defines for SCO systems from sco.h. */
-
-/* By default, target has a 80387, uses IEEE compatible arithmetic,
-   and returns float values in the 387, ie,
-   (TARGET_80387 | TARGET_FLOAT_RETURNS_IN_80387)
-
-   SCO's software emulation of a 387 fails to handle the `fucomp'
-   opcode.  fucomp is only used when generating IEEE compliant code.
-   So don't make TARGET_IEEE_FP default for SCO. */
-
-#undef TARGET_SUBTARGET_DEFAULT
-#define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_FLOAT_RETURNS)
-
-/* Use crt1.o as a startup file and crtn.o as a closing file.  */
-
-#undef STARTFILE_SPEC
-#define STARTFILE_SPEC \
-  "%{!r:%{!z:svr3.ifile%s}%{z:svr3z.ifile%s}}\
-   %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}"
-
-/* Library spec, including SCO international language support. */
-
-#undef LIB_SPEC
-#define LIB_SPEC \
- "%{p:-L/usr/lib/libp}%{pg:-L/usr/lib/libp} %{scointl:libintl.a%s} -lc"
-
-/* Specify predefined symbols in preprocessor.  */
-
-#undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dunix -DM_UNIX -DM_I386 -DM_COFF -DM_WORDSWAP -Asystem=svr3"
-
-#undef CPP_SPEC
-#define CPP_SPEC "%(cpp_cpu) %{scointl:-DM_INTERNAT}"
-
-/* This spec is used for telling cpp whether char is signed or not.  */
-
-#undef SIGNED_CHAR_SPEC
-#if DEFAULT_SIGNED_CHAR
-#define SIGNED_CHAR_SPEC \
- "%{funsigned-char:-D__CHAR_UNSIGNED__ -D_CHAR_UNSIGNED}"
-#else
-#define SIGNED_CHAR_SPEC \
- "%{!fsigned-char:-D__CHAR_UNSIGNED__ -D_CHAR_UNSIGNED}"
-#endif
-
-/* caller has to pop the extra argument passed to functions that return
-   structures. */
-
-#undef RETURN_POPS_ARGS
-#define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE)   \
-  ((FUNDECL) && TREE_CODE (FUNDECL) == IDENTIFIER_NODE ? 0	\
-   : (TARGET_RTD						\
-      && (TYPE_ARG_TYPES (FUNTYPE) == 0				\
-	  || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE)))	\
-	      == void_type_node))) ? (SIZE)			\
-   : 0)
-/* On other 386 systems, the last line looks like this:
-   : (aggregate_value_p (TREE_TYPE (FUNTYPE))) ? GET_MODE_SIZE (Pmode) : 0)  */
-
-/* Use periods rather than dollar signs in special g++ assembler names.  */
-
-#define NO_DOLLAR_IN_LABEL
-
-/* Handle #pragma pack. */
-#define HANDLE_SYSV_PRAGMA
===================================================================
Index: config/i386/x-sco4
--- config/i386/x-sco4	Mon May  7 12:27:33 2001
+++ config/i386/x-sco4	Tue May  5 13:32:27 1998
@@ -1,2 +0,0 @@
-# See all the declarations.
-FIXPROTO_DEFINES = -D_XOPEN_SOURCE
===================================================================
Index: optabs.c
--- optabs.c	2001/05/06 19:47:15	1.94
+++ optabs.c	2001/05/07 19:27:00
@@ -4909,23 +4909,6 @@ init_optabs ()
   ggc_add_rtx_root (libfunc_table, LTI_MAX);
 }
 
-#ifdef BROKEN_LDEXP
-
-/* SCO 3.2 apparently has a broken ldexp.  */
-
-double
-ldexp(x,n)
-     double x;
-     int n;
-{
-  if (n > 0)
-    while (n--)
-      x *= 2;
-
-  return x;
-}
-#endif /* BROKEN_LDEXP */
-
 #ifdef HAVE_conditional_trap
 /* The insn generating function can not take an rtx_code argument.
    TRAP_RTX is used as an rtx argument.  Its code is replaced with