[Bug gas/31319] New: [2.42 regression]: `.arch i386` is rejected by `x86_64` target: 4bit mode not supported on `i386'.

[slyich at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31319

            Bug ID: 31319
           Summary: [2.42 regression]: `.arch i386` is rejected by
                    `x86_64` target: 4bit mode not supported on `i386'.
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: slyich at gmail dot com
  Target Milestone: ---

Created attachment 15346
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15346&action=edit
entry32-16-debug.s

Initially observed the failure on kexec-tools-2.0.27 package at
https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git/tree/purgatory/arch/i386/entry32-16-debug.S#n28

Attached self-contained `entry32-16-debug.s` file.

binutils-2.40 and 2.41 worked:

    $ as-2.40  --64 -o entry32-16-debug.o entry32-16-debug.s
    # ok

binutils-2.42 fails as:

    $ as-2.42 --64 -o entry32-16-debug.o entry32-16-debug.s
    purgatory/arch/i386/entry32-16-debug.S: Assembler messages:
    purgatory/arch/i386/entry32-16-debug.S:28: Error: 64bit mode not supported
on `i386'.

$ as --version
GNU assembler (GNU Binutils) 2.42
Copyright (C) 2024 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `x86_64-unknown-linux-gnu'.

Configured as:

--prefix=/<<NIX>>/binutils-2.42 --bindir=/<<NIX>>/binutils-2.42/bin
--sbindir=/<<NIX>>/binutils-2.42/sbin
--includedir=/<<NIX>>/binutils-2.42-dev/include
--oldincludedir=/<<NIX>>/binutils-2.42-dev/include
--mandir=/<<NIX>>/binutils-2.42-man/share/man
--infodir=/<<NIX>>/binutils-2.42-info/share/info
--docdir=/<<NIX>>/binutils-2.42/share/doc/binutils
--libdir=/<<NIX>>/binutils-2.42-lib/lib
--libexecdir=/<<NIX>>/binutils-2.42-lib/libexec
--localedir=/<<NIX>>/binutils-2.42-lib/share/locale --enable-64-bit-bfd
--with-system-zlib --enable-deterministic-archives --disable-werror
--enable-fix-loongson2f-nop --enable-new-dtags --program-prefix=
--disable-gprofng --with-lib-path=: --enable-gold --enable-plugins
--enable-shared --disable-static --build=x86_64-unknown-linux-gnu
--host=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu

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