[Bug bootstrap/84326] New: [8 Regression] bootstrap fails on powerpc64-linux-gnu when configured wth --with-cpu-32=power7 --with-cpu-64=power7

["doko at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84326

            Bug ID: 84326
           Summary: [8 Regression] bootstrap fails on powerpc64-linux-gnu
                    when configured wth --with-cpu-32=power7
                    --with-cpu-64=power7
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org
  Target Milestone: ---

trunk r257477 fails to build at least on powerpc64-linux-gnu, when configuring
with --with-cpu-32=power7 --with-cpu-64=power7 (checked with a cross compiler).
the binutils 2.30 branch is used. Seen PR77847, PR80210.

make[4]: Entering directory
'/home/packages/cross/8/u/gcc-8-cross-ports-1ubuntu1/gcc/build/gcc'
for tool in gnatbind gnatchop gnat gnatkr gnatlink gnatls gnatmake gnatname
gnatprep gnatxref gnatfind gnatclea
n ; do \
  if [ -f $tool ] ; \
  then \
    mv $tool $tool-cross; \
  fi; \
done
/home/packages/cross/8/u/gcc-8-cross-ports-1ubuntu1/gcc/build/./gcc/xgcc
-B/home/packages/cross/8/u/gcc-8-cross-ports-1ubuntu1/gcc/build/./gcc/ -xc
-nostdinc /dev/null -S -o /dev/null
-fself-test=../../src/gcc/testsuite/selftests
cc1: warning: will not generate 'power7' instructions because assembler lacks
'power7' support
cc1: error: '-msecure-plt' not supported by your assembler
cc1: note: self-tests are not enabled in this build
Makefile:1986: recipe for target 's-selftest-c' failed
make[4]: *** [s-selftest-c] Error 1
make[4]: Leaving directory
'/home/packages/cross/8/u/gcc-8-cross-ports-1ubuntu1/gcc/build/gcc'
Makefile:4305: recipe for target 'all-gcc' failed
make[3]: *** [all-gcc] Error 2
make[3]: Leaving directory
'/home/packages/cross/8/u/gcc-8-cross-ports-1ubuntu1/gcc/build'
Makefile:906: recipe for target 'all' failed
make[2]: *** [all] Error 2


GCC is configured with
         --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++
         --prefix=/usr
         --with-gcc-major-version-only
         --program-suffix=-8
         --enable-shared
         --enable-linker-build-id
         --libexecdir=/usr/lib
         --without-included-gettext
         --enable-threads=posix
         --libdir=/usr/lib
         --enable-nls
         --with-sysroot=/
         --enable-clocale=gnu
         --enable-libstdcxx-debug
         --enable-libstdcxx-time=yes
         --with-default-libstdcxx-abi=new
         --enable-gnu-unique-object
         --disable-libquadmath
         --enable-plugin
         --with-system-zlib
         --disable-libphobos
         --enable-secureplt
         --disable-softfloat
         --enable-targets=powerpc64-linux,powerpc-linux
         --with-cpu-32=power7
         --with-cpu-64=power7
         --enable-multiarch
         --disable-werror
         --with-long-double-128
         --enable-multilib
         --enable-checking=release
         --build=x86_64-linux-gnu
         --host=x86_64-linux-gnu
         --target=powerpc64-linux-gnu
         --program-prefix=powerpc64-linux-gnu-
         --includedir=/usr/powerpc64-linux-gnu/include