[Bug gas/28794] New: Kernel build on big-endian PowerPC fails with 'Error: unrecognized opcode'

[glaubitz at physik dot fu-berlin.de]

https://sourceware.org/bugzilla/show_bug.cgi?id=28794

            Bug ID: 28794
           Summary: Kernel build on big-endian PowerPC fails with 'Error:
                    unrecognized opcode'
           Product: binutils
           Version: 2.38 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: glaubitz at physik dot fu-berlin.de
                CC: doko at debian dot org, jrtc27 at jrtc27 dot com,
                    matorola at gmail dot com, schwab@linux-m68k.org
  Target Milestone: ---
              Host: powerpc*-*-*

The latest version of the binutils package in Debian, 2.37.50.20220106-2, broke
the build of the kernel on 32- and 64-bit big-endian PowerPC.

The build fails the error message "Error: unrecognized opcode", such as:

{standard input}: Assembler messages:
{standard input}:1353: Error: unrecognized opcode: `ptesync'

and:

{standard input}: Assembler messages:
{standard input}:2146: Error: unrecognized opcode: `stbcix'

Full kernel build log for 32-bit PowerPC here:

> https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=5.15.15-1&stamp=1642579068&raw=0

and 64-bit PowerPC here:

> https://buildd.debian.org/status/fetch.php?pkg=linux&arch=ppc64&ver=5.15.15-1&stamp=1642578946&raw=0

Previous builds with the binutils package version 2.37-10 worked fine:

> https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=5.16%7Erc8-1%7Eexp1&stamp=1641317466&raw=0
> https://buildd.debian.org/status/fetch.php?pkg=linux&arch=ppc64&ver=5.16%7Erc8-1%7Eexp1&stamp=1641292055&raw=0

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