[Bug c++/85655] New: ICE with -flto and -O2 during IPA pass: cp lto1: internal compiler error: Segmentation fault

[steffen at hauihau dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85655

            Bug ID: 85655
           Summary: ICE with -flto and -O2 during IPA pass: cp lto1:
                    internal compiler error: Segmentation fault
           Product: gcc
           Version: 8.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: steffen at hauihau dot de
  Target Milestone: ---

Created attachment 44072
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44072&action=edit
reduced testcase

Attached testcase (derived from MariaDB 10.3.6 sql/sys_vars.cc) produces an ICE
with segmenatation fault. -flto with at least -O2 is needed to trigger the ICE.

schlepptop ~ #  g++ -flto -O2 /tmp/sys_vars.ii
during IPA pass: cp
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error: /usr/x86_64-pc-linux-gnu/gcc-bin/8.1.0/g++ returned 1
exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/../../../../x86_64-pc-linux-gnu/bin/ld:
fatal error: lto-wrapper failed
collect2: error: ld returned 1 exit status


schlepptop ~ #  g++ -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/8.1.0/g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/8.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/home/gentoo/tmp/portage/sys-devel/gcc-8.1.0/work/gcc-8.1.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/8.1.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.1.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.1.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.1.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.1.0/include/g++-v8
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/8.1.0/python
--enable-languages=c,c++,fortran --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 8.1.0 p1.0' --disable-esp --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts
--disable-libmpx --enable-vtable-verify --enable-libvtv --enable-lto
--without-isl --enable-libsanitizer --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 8.1.0 (Gentoo 8.1.0 p1.0)