[Bug c++/88293] New: ICE on C++11 code: in build_target_expr_with_type, at cp/tree.c:793

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88293

            Bug ID: 88293
           Summary: ICE on C++11 code: in build_target_expr_with_type, at
                    cp/tree.c:793
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

This appears to be a recent regression.

$ g++tk -v
Using built-in specs.
COLLECT_GCC=g++tk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 9.0.0 20181201 (experimental) [trunk revision 266708] (GCC) 
$ 
$ g++-8.1.0 -c tmp.cpp
$ clang++ -std=c++11 -c tmp.cpp
$ 
$ g++tk -c tmp.cpp
tmp.cpp:8:27: internal compiler error: in build_target_expr_with_type, at
cp/tree.c:793
    8 | const int &f = (B(), B()).v;
      |                           ^
0x8ea6c6 build_target_expr_with_type(tree_node*, tree_node*, int)
        ../../gcc-source-trunk/gcc/cp/tree.c:793
0x6f37b0 cxx_eval_outermost_constant_expr
        ../../gcc-source-trunk/gcc/cp/constexpr.c:5119
0x6f7679 maybe_constant_init_1
        ../../gcc-source-trunk/gcc/cp/constexpr.c:5382
0x6b8808 set_up_extended_ref_temp
        ../../gcc-source-trunk/gcc/cp/call.c:11189
0x6b8808 extend_ref_init_temps_1
        ../../gcc-source-trunk/gcc/cp/call.c:11349
0x9142d9 store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ../../gcc-source-trunk/gcc/cp/typeck2.c:823
0x72b482 check_initializer
        ../../gcc-source-trunk/gcc/cp/decl.c:6486
0x754675 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc-source-trunk/gcc/cp/decl.c:7162
0x8188cd cp_parser_init_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:20254
0x81929c cp_parser_simple_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:13398
0x822e04 cp_parser_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:13087
0x821b0e cp_parser_translation_unit
        ../../gcc-source-trunk/gcc/cp/parser.c:4674
0x821b0e c_parse_file()
        ../../gcc-source-trunk/gcc/cp/parser.c:40701
0x9798aa c_common_parse_file()
        ../../gcc-source-trunk/gcc/c-family/c-opts.c:1151
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ 


--------------------------------


struct A { int v; };

struct B : A
{
  constexpr B () : A () {}
};

const int &f = (B(), B()).v;