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Re: [patch 2.95.3 branch]: Make ARM compiler recognize recent binutils

To: Bernd Schmidt <bernds at redhat dot com>
Subject: Re: [patch 2.95.3 branch]: Make ARM compiler recognize recent binutils
From: Manfred Hollstein <manfredh at redhat dot com>
Date: Thu, 21 Dec 2000 15:11:04 +0100 (CET)
Cc: <gcc-patches at gcc dot gnu dot org>, <pb at futuretv dot com>, <philb at gnu dot org>
References: <14914.2771.996615.694921@saturn.hollstein.net><Pine.LNX.4.30.0012211357040.24133-100000@host140.cambridge.redhat.com>
Reply-To: Manfred Hollstein <manfred dot h at gmx dot net>
On Thursday, 21 December 2000, 14:00:06 +0000, bernds@redhat.com wrote:

> On Thu, 21 Dec 2000, Manfred Hollstein wrote:
> 
> > I'd like the appended patch to be integrated into the upcoming 2.95.3
> > release. Without this patch, gcc-2.95.3 will be pretty much useless on
> > ARM Linux systems, as recent versions of GNU ARM ld (including 2.10)
> > do not recognize the emulation name which is passed in the invocation
> > from gcc.
> 
> Was this due to a change in binutils?  Why was this change made if it
> means no existing release of gcc can be used on arm-linux targets?

This is the ChangeLog entry from ld/ChangeLog:

1999-04-12  Philip Blundell  <pb@nexus.co.uk>

	* emulparams/armelf_linux.sh: New file.  Support for ARM
	GNU/Linux ELF ABI.
	* emulparams/armelf_linux26.sh: New file. APCS-26 version of above.
	* configure.tgt: For arm*-*-linux-gnu*, set default emulation to
	`armelf_linux', and also include `armelf_linux26' and `armelf'.
	* Makefile.am: Add rules to make earmlinux.c and earmlinux26.c.
	(ALL_EMULATIONS): Add earmlinux.o and earmlinux26.o.
	* Makefile.in: Regenerate.

I remember lots of discussions on renaming elf32_armlinux (or however
it was called) into armelf_linux on the various mailing lists. But, without
this patch (the mainline contains an even better one), gcc is pretty
much useless.

Cheers.

l8er
manfred

> 
> Philip, can you confirm that the patch below is necessary?
> 
> 
> Bernd
> 
> 
> > 	Fri Sep 10 11:43:07 1999  Philip Blundell <pb@futuretv.com>
> >
> > 	* configure.in, config/arm/linux-oldld.h,
> > 	config/arm/linux-elf26.h, config/arm/linux-elf.h: Backport latest
> > 	ARM GNU/Linux config from mainline.
> > 	* configure: Regenerate.
> >
> > 	Fri Jul 16 10:29:48 1999  Philip Blundell  <pb@futuretv.com>
> >
> > 	* config/arm/linux-elf.h (MULTILIB_DEFAULTS): Define.
> > 	(SUBTARGET_EXTRA_LINK_SPEC): Provide alternative definition for
> > 	use with new binutils.
> >
> > 	* config/arm/t-linux (EXTRA_MULTILIB_PARTS): Define.
> > 	(MULTILIB_OPTIONS, MULTILIB_DIRNAMES): Multilib for hard/soft
> > 	float by default.
> >
> > diff -rupN -x CVS -x RCS -x *.o -x *.info* -x *.html* -x *.elc -x *.dvi -x *.orig -x *~ -x version.el gcc-2.95.3.orig/gcc/config/arm/linux-elf.h gcc-2.95.3/gcc/config/arm/linux-elf.h
> > --- gcc-2.95.3.orig/gcc/config/arm/linux-elf.h	Wed Dec 20 13:59:36 2000
> > +++ gcc-2.95.3/gcc/config/arm/linux-elf.h	Thu Dec 21 12:43:01 2000
> > @@ -28,13 +28,34 @@ Boston, MA 02111-1307, USA.  */
> >  /* We have libgcc2.  */
> >  #define HAVE_ATEXIT
> >
> > -/* Default is to use APCS-32 mode.  */
> >  #ifndef SUBTARGET_DEFAULT_APCS26
> > -#define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SHORT_BYTE)
> > -#define SUBTARGET_EXTRA_LINK_SPEC	\
> > +/* Default is to use APCS-32 mode.  */
> > +# define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SHORT_BYTE)
> > +# ifdef SUBTARGET_OLD_LINKER
> > +#  define SUBTARGET_EXTRA_LINK_SPEC	\
> >  	" %{mapcs-26:-m elf32arm26} %{!mapcs-26:-m elf32arm}"
> > -#define SUBTARGET_EXTRA_ASM_SPEC	\
> > +# else	/* new linker */
> > +#  define SUBTARGET_EXTRA_LINK_SPEC	\
> > +	" %{mapcs-26:-m armelf_linux26} %{!mapcs-26:-m armelf_linux} -p"
> > +# endif
> > +# define SUBTARGET_EXTRA_ASM_SPEC	\
> >  	" %{mapcs-26:-mapcs-26} %(!mapcs-26:-mapcs-32}"
> > +# define MULTILIB_DEFAULTS \
> > +	{ "mlittle-endian", "mhard-float", "mapcs-32", "mno-thumb-interwork" }
> > +# define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
> > +#else	/* default is APCS-26 */
> > +# define TARGET_DEFAULT (ARM_FLAG_SHORT_BYTE)
> > +# ifdef SUBTARGET_OLD_LINKER
> > +#  define SUBTARGET_LINK_SPEC	\
> > +	" %{mapcs-32:-m elf32arm} %{!mapcs-32:-m elf32arm26}"
> > +# else	/* new linker */
> > +#  define SUBTARGET_LINK_SPEC	\
> > +	" %{mapcs-32:-m armelf_linux} %{!mapcs-32:-m armelf_linux26} -p"
> > +# endif
> > +# define SUBTARGET_EXTRA_ASM_SPEC	\
> > +	" %{mapcs-32:-mapcs-32} %(!mapcs-32:-mapcs-26}"
> > +# define MULTILIB_DEFAULTS \
> > +	{ "mlittle-endian", "mhard-float", "mapcs-26", "mno-thumb-interwork" }
> >  #endif
> >
> >  /* This was defined in linux.h.  Define it here also. */
> > diff -rupN -x CVS -x RCS -x *.o -x *.info* -x *.html* -x *.elc -x *.dvi -x *.orig -x *~ -x version.el gcc-2.95.3.orig/gcc/config/arm/linux-elf26.h gcc-2.95.3/gcc/config/arm/linux-elf26.h
> > --- gcc-2.95.3.orig/gcc/config/arm/linux-elf26.h	Sat Dec 19 10:11:45 1998
> > +++ gcc-2.95.3/gcc/config/arm/linux-elf26.h	Thu Dec 21 12:43:01 2000
> > @@ -1,6 +1,7 @@
> > -/* Definitions for 26-bit ARM running Linux-based GNU systems using ELF
> > -   Copyright (C) 1998 Free Software Foundation, Inc.
> > -   Contributed by Philip Blundell <philb@gnu.org>
> > +/* Definitions for ARM running Linux-based GNU systems
> > +   using ELF and 26-bit APCS.
> > +   Copyright (C) 1999 Free Software Foundation, Inc.
> > +   Contributed by Philip Blundell <Philip.Blundell@pobox.com>
> >
> >  This file is part of GNU CC.
> >
> > @@ -19,14 +20,5 @@ along with this program; see the file CO
> >  the Free Software Foundation, 59 Temple Place - Suite 330,
> >  Boston, MA 02111-1307, USA.  */
> >
> > +/* Tell linux-elf.h to default to 26-bit mode.  */
> >  #define SUBTARGET_DEFAULT_APCS26
> > -
> > -#define SUBTARGET_LINK_SPEC	\
> > -	" %{mapcs-32:-m elf32arm} %{!mapcs-32:-m elf32arm26}"
> > -
> > -#define SUBTARGET_EXTRA_ASM_SPEC	\
> > -	" %{mapcs-32:-mapcs-32} %(!mapcs-32:-mapcs-26}"
> > -
> > -#define TARGET_DEFAULT (ARM_FLAG_SHORT_BYTE)
> > -
> > -#include "arm/linux-elf.h"
> > diff -rupN -x CVS -x RCS -x *.o -x *.info* -x *.html* -x *.elc -x *.dvi -x *.orig -x *~ -x version.el gcc-2.95.3.orig/gcc/config/arm/linux-elf26.h gcc-2.95.3/gcc/config/arm/linux-elf26.h
> > --- gcc-2.95.3.orig/gcc/config/arm/linux-oldld.h	Tue Nov  7 16:06:25 2000
> > +++ gcc-2.95.3/gcc/config/arm/linux-oldld.h
> > @@ -0,0 +1,27 @@
> > +/* Definitions for ARM running Linux-based GNU systems
> > +   using ELF with old binutils.
> > +   Copyright (C) 1999 Free Software Foundation, Inc.
> > +   Contributed by Philip Blundell <Philip.Blundell@pobox.com>
> > +
> > +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 this program; see the file COPYING.  If not, write to
> > +the Free Software Foundation, 59 Temple Place - Suite 330,
> > +Boston, MA 02111-1307, USA.  */
> > +
> > +/* Unfortunately, owing to various historical accidents, version 2.9.4
> > +   and newer of GNU binutils are not quite compatible with the old
> > +   (2.9.1-based) toolset.  This tells linux-elf.h to generate specs
> > +   appropriate for the older versions.  */
> > +#define SUBTARGET_OLD_LINKER
> > diff -rupN -x CVS -x RCS -x *.o -x *.info* -x *.html* -x *.elc -x *.dvi -x *.orig -x *~ -x version.el gcc-2.95.3.orig/gcc/config/arm/t-linux gcc-2.95.3/gcc/config/arm/t-linux
> > --- gcc-2.95.3.orig/gcc/config/arm/t-linux	Sat Mar 27 15:33:31 1999
> > +++ gcc-2.95.3/gcc/config/arm/t-linux	Thu Dec 21 12:43:01 2000
> > @@ -13,10 +13,15 @@ LIBGCC1 = libgcc1-asm.a
> >  LIB1ASMSRC = arm/lib1funcs.asm
> >  LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx
> >
> > +MULTILIB_OPTIONS = mhard-float/msoft-float
> > +MULTILIB_DIRNAMES = hard-float soft-float
> > +
> >  # If you want to build both APCS variants as multilib options this is how
> >  # to do it.
> > -#MULTILIB_OPTIONS = mapcs-32/apcs-26
> > -#MULTILIB_DIRNAMES = apcs-32 apcs-26
> > +#MULTILIB_OPTIONS += mapcs-32/mapcs-26
> > +#MULTILIB_DIRNAMES += apcs-32 apcs-26
> > +
> > +EXTRA_MULTILIB_PARTS = crtbegin.o crtend.o
> >
> >  LIBGCC = stmp-multilib
> >  INSTALL_LIBGCC = install-multilib
> > diff -rupN -x CVS -x RCS -x *.o -x *.info* -x *.html* -x *.elc -x *.dvi -x *.orig -x *~ -x version.el gcc-2.95.3.orig/gcc/configure.in gcc-2.95.3/gcc/configure.in
> > --- gcc-2.95.3.orig/gcc/configure.in	Tue Jan 11 09:21:04 2000
> > +++ gcc-2.95.3/gcc/configure.in	Thu Dec 21 12:43:01 2000
> > @@ -756,15 +756,31 @@ changequote([,])dnl
> >  		tmake_file=arm/t-linux
> >  		gnu_ld=yes
> >  		;;
> > -	arm*-*-linux-gnu*)		# ARM GNU/Linux with ELF
> > +	arm*-*-linux-gnuoldld*)		# ARM GNU/Linux with old ELF linker
> >  		xm_file=arm/xm-linux.h
> >  		xmake_file=x-linux
> > +		tm_file="arm/linux-oldld.h arm/linux-elf.h"
> >  		case $machine in
> >  		armv2*-*-*)
> > -			tm_file=arm/linux-elf26.h
> > +			tm_file="arm/linux-elf26.h $tm_file"
> > +			;;
> > +		esac
> > +		tmake_file="t-linux arm/t-linux"
> > +		extra_parts="crtbegin.o crtbeginS.o crtend.o crtendS.o"
> > +		gnu_ld=yes
> > +		case x${enable_threads} in
> > +		x | xyes | xpthreads | xposix)
> > +			thread_file='posix'
> >  			;;
> > -		*)
> > -			tm_file=arm/linux-elf.h
> > +		esac
> > +		;;
> > +	arm*-*-linux-gnu*)		# ARM GNU/Linux with ELF
> > +		xm_file=arm/xm-linux.h
> > +		xmake_file=x-linux
> > +		tm_file="arm/linux-elf.h"
> > +		case $machine in
> > +		armv2*-*-*)
> > +			tm_file="arm/linux-elf26.h $tm_file"
> >  			;;
> >  		esac
> >  		tmake_file="t-linux arm/t-linux"
> > diff -rupN -x CVS -x RCS -x *.o -x *.info* -x *.html* -x *.elc -x *.dvi -x *.orig -x *~ -x version.el gcc-2.95.3.orig/gcc/configure gcc-2.95.3/gcc/configure
> > --- gcc-2.95.3.orig/gcc/configure	Sat Jul  8 16:04:38 2000
> > +++ gcc-2.95.3/gcc/configure	Thu Dec 21 12:43:01 2000
> > @@ -3194,15 +3194,31 @@ for machine in $build $host $target; do
> >  		tmake_file=arm/t-linux
> >  		gnu_ld=yes
> >  		;;
> > -	arm*-*-linux-gnu*)		# ARM GNU/Linux with ELF
> > +	arm*-*-linux-gnuoldld*)		# ARM GNU/Linux with old ELF linker
> >  		xm_file=arm/xm-linux.h
> >  		xmake_file=x-linux
> > +		tm_file="arm/linux-oldld.h arm/linux-elf.h"
> >  		case $machine in
> >  		armv2*-*-*)
> > -			tm_file=arm/linux-elf26.h
> > +			tm_file="arm/linux-elf26.h $tm_file"
> > +			;;
> > +		esac
> > +		tmake_file="t-linux arm/t-linux"
> > +		extra_parts="crtbegin.o crtbeginS.o crtend.o crtendS.o"
> > +		gnu_ld=yes
> > +		case x${enable_threads} in
> > +		x | xyes | xpthreads | xposix)
> > +			thread_file='posix'
> >  			;;
> > -		*)
> > -			tm_file=arm/linux-elf.h
> > +		esac
> > +		;;
> > +	arm*-*-linux-gnu*)		# ARM GNU/Linux with ELF
> > +		xm_file=arm/xm-linux.h
> > +		xmake_file=x-linux
> > +		tm_file="arm/linux-elf.h"
> > +		case $machine in
> > +		armv2*-*-*)
> > +			tm_file="arm/linux-elf26.h $tm_file"
> >  			;;
> >  		esac
> >  		tmake_file="t-linux arm/t-linux"
> >
References:
- [patch 2.95.3 branch]: Make ARM compiler recognize recent binutils
  - From: Manfred Hollstein
- Re: [patch 2.95.3 branch]: Make ARM compiler recognize recent binutils
  - From: Bernd Schmidt
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