Bug#996643: gcc-11: FTBFS on hppa - Bootstrap comparison failure!

[John David Anglin <dave.anglin@bell.net>]

Source: gcc-11
Version: 11.2.0-9
Severity: normal

Dear Maintainer,

Build fails here:

Comparing stages 2 and 3
warning: gcc/cc1objplus-checksum.o differs
warning: gcc/cc1obj-checksum.o differs
warning: gcc/m2/gm2-compiler-boot/M2Version.o differs
Bootstrap comparison failure!
gcc/SYSTEM.o differs

SYSTEM.o is probably a m2 file.  Not sure why it's in gcc directory.
It seems to be excluded when its in gcc/m2/gm2-compiler-boot:

# DP: ignore gm2version.o stage diff on some archtectures (m68k, riscv64)

--- a/src/configure.ac
+++ b/src/configure.ac
@@ -3678,6 +3678,7 @@ AC_SUBST(stage2_werror_flag)
 compare_exclusions="gcc/cc*-checksum\$(objext) | gcc/ada/*tools/*"
 compare_exclusions="$compare_exclusions | gcc/m2/gm2-compiler-boot/M2Version*"
 compare_exclusions="$compare_exclusions | gcc/m2/gm2-compiler-boot/SYSTEM*"
+compare_exclusions="$compare_exclusions | *m2/gm2version\$(objext)"

Regards,
Dave

-- System Information:
Debian Release: bookworm/sid
  APT prefers buildd-unstable
  APT policy: (500, 'buildd-unstable'), (500, 'unstable')
Architecture: hppa (parisc64)

Kernel: Linux 5.14.10+ (SMP w/4 CPU threads)
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

-- no debconf information