[Bug c/80201] New: groff build fails with -floop-nest-optimize -fgraphite-identity

["fjeldse at hotmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80201

            Bug ID: 80201
           Summary: groff build fails with -floop-nest-optimize
                    -fgraphite-identity
           Product: gcc
           Version: 6.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fjeldse at hotmail dot com
  Target Milestone: ---

Created attachment 41054
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41054&action=edit
getopt.c preprocessed source

When building groff-1.22.2 (Gentoo) on GCC 6.3.0, I receive the following
error:

i686-pc-linux-gnu-gcc -I. -I.
-I/var/tmp/portage/sys-apps/groff-1.22.2/work/groff-1.22.2/src/include
-I/var/tmp/portage/sys-apps/groff-1.22.2/work/groff-1.22.2/src/include
-I/var/tmp/portage/sys-apps/groff-1.22.2/work/groff-1.22.2/src/libs/gnulib/lib
-DHAVE_CONFIG_H -O2 -pipe -floop-nest-optimize -fgraphite-identity
-march=native  -c -D__GETOPT_PREFIX=groff_ -DENABLE_RELOCATABLE=1
-DLIBDIR=\"/usr/lib\" getopt.c

getopt.c: In function 'exchange':
getopt.c:171:1: internal compiler error: in add_loop_constraints, at
graphite-sese-to-poly.c:933
 exchange (char **argv, struct _getopt_data *d)
 ^~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.gentoo.org/> for instructions.

GCC specs are as follows:
Using built-in specs.
COLLECT_GCC=/usr/i686-pc-linux-gnu/gcc-bin/6.3.0/i686-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-pc-linux-gnu/6.3.0/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-6.3.0/work/gcc-6.3.0/configure
--host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --prefix=/usr
--bindir=/usr/i686-pc-linux-gnu/gcc-bin/6.3.0
--includedir=/usr/lib/gcc/i686-pc-linux-gnu/6.3.0/include
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/6.3.0
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/6.3.0/man
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/6.3.0/info
--with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/6.3.0/include/g++-v6
--with-python-dir=/share/gcc-data/i686-pc-linux-gnu/6.3.0/python
--enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror
--with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo Hardened 6.3.0 p1.0' --enable-esp
--enable-libstdcxx-time --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--disable-multilib --disable-altivec --disable-fixed-point --with-arch=i686
--enable-targets=all --disable-libgcj --enable-libgomp --disable-libmudflap
--disable-libssp --disable-libcilkrts --disable-libmpx --enable-vtable-verify
--enable-libvtv --disable-libquadmath --enable-lto --with-isl
--disable-isl-version-check --disable-libsanitizer --disable-default-pie
--enable-default-ssp
Thread model: posix
gcc version 6.3.0 (Gentoo Hardened 6.3.0 p1.0)