[Bug c++/89767] New: ICE with tuple and optimization

[klystron25 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89767

            Bug ID: 89767
           Summary: ICE with tuple and optimization
           Product: gcc
           Version: 8.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: klystron25 at gmail dot com
  Target Milestone: ---

Created attachment 45994
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45994&action=edit
preprocessed source

The following source file causes ICE when -O2 is used. This code compiles
correctly with the same command line on gcc 7.3.0.

This is gcc 8.3.0 running on amd64. I am runnig gentoo, but I downloaded 8.3.0
source and built it from scratch just to ensure it wasn't gentoo's patchset. I
tried a simple configure with just --enable-languages=c,c++ and then this below
which I'm providing the report from:

Configured with: /var/tmp/portage/sys-devel/gcc-8.3.0/work/gcc-8.3.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/8.3.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.3.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.3.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.3.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/g++-v8
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/8.3.0/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 8.3.0 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 --enable-libgomp
--disable-libmudflap --disable-libssp --disable-libmpx --disable-systemtap
--enable-vtable-verify --disable-libquadmath --enable-lto --without-isl
--enable-default-pie --enable-default-ssp
Thread model: posix

/home/darkwing/gcc/usr/x86_64-pc-linux-gnu/gcc-bin/8.3.0/c++  -Dmsb_EXPORTS
-I/home/darkwing/work/nasa/pace/opt/include/efsi
-I/home/darkwing/work/efs/sts/repos/cvt/msb/libmsb/include
-I/home/darkwing/work/efs/sts/repos/cvt/msb/libmsb/include/internal  -fPIC  
-fvisibility=hidden --std=c++14 -pedantic -Wall -Wextra -Wundef
-Wno-noexcept-type -save-temps -o
CMakeFiles/msb.dir/src/connection/internal.cpp.o -c
/home/darkwing/work/efs/sts/repos/cvt/msb/libmsb/src/connection/internal.cpp
-O2

In file included from
/home/darkwing/gcc/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/g++-v8/bits/hashtable_policy.h:34,
                 from
/home/darkwing/gcc/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/g++-v8/bits/hashtable.h:35,
                 from
/home/darkwing/gcc/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/g++-v8/unordered_map:46,
                 from
/home/darkwing/work/efs/sts/repos/cvt/msb/libmsb/include/internal/connection.hpp:4,
                 from
/home/darkwing/work/efs/sts/repos/cvt/msb/libmsb/src/connection/internal.cpp:1:
/home/darkwing/gcc/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/g++-v8/tuple:
In instantiation of ‘constexpr _Head& std::__get_helper(std::_Tuple_impl<_Idx,
_Head, _Tail ...>&) [with long unsigned int __i = 1; _Head =
std::shared_ptr<msb::node>; _Tail = {}]’:
/home/darkwing/gcc/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/g++-v8/tuple:1315:36:
  required from ‘constexpr std::__tuple_element_t<__i, std::tuple<_Elements
...> >& std::get(std::tuple<_Elements ...>&) [with long unsigned int __i = 1;
_Elements = {std::shared_ptr<msb::internal::model_support::node_subscriber>,
std::shared_ptr<msb::node>}; std::__tuple_element_t<__i, std::tuple<_Elements
...> > = std::shared_ptr<msb::node>]’
/home/darkwing/work/efs/sts/repos/cvt/msb/libmsb/src/connection/internal.cpp:92:92:
  required from here
/home/darkwing/gcc/usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/g++-v8/tuple:1303:5:
internal compiler error: Segmentation fault
     __get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept
     ^~~~~~~~~~~~
0xb5688f crash_signal
        ../../gcc-8.3.0/gcc/toplev.c:325
0x66d25d check_local_shadow
        ../../gcc-8.3.0/gcc/cp/name-lookup.c:2670
0x66d25d do_pushdecl
        ../../gcc-8.3.0/gcc/cp/name-lookup.c:3084
0x66d25d pushdecl(tree_node*, bool)
        ../../gcc-8.3.0/gcc/cp/name-lookup.c:3152
0x617626 store_parm_decls
        ../../gcc-8.3.0/gcc/cp/decl.c:15454
0x617626 start_preparsed_function(tree_node*, tree_node*, int)
        ../../gcc-8.3.0/gcc/cp/decl.c:15328
0x6b84b8 instantiate_decl(tree_node*, bool, bool)
        ../../gcc-8.3.0/gcc/cp/pt.c:24048
0x5f26e4 cxx_eval_call_expression
        ../../gcc-8.3.0/gcc/cp/constexpr.c:1563
0x5f374d cxx_eval_constant_expression
        ../../gcc-8.3.0/gcc/cp/constexpr.c:4231
0x5f741c cxx_eval_outermost_constant_expr
        ../../gcc-8.3.0/gcc/cp/constexpr.c:4894
0x5f937e maybe_constant_value(tree_node*, tree_node*)
        ../../gcc-8.3.0/gcc/cp/constexpr.c:5112
0x603f92 cp_fold
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2521
0x6043cc cp_fold_maybe_rvalue
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2075
0x6033ca cp_fold_maybe_rvalue
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2216
0x6033ca cp_fold
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2216
0x6043cc cp_fold_maybe_rvalue
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2075
0x6033ca cp_fold_maybe_rvalue
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2216
0x6033ca cp_fold
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2216
0x6043cc cp_fold_maybe_rvalue
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2075
0x6033ca cp_fold_maybe_rvalue
        ../../gcc-8.3.0/gcc/cp/cp-gimplify.c:2216
Please submit a full bug report,
with preprocessed source if appropriate.