[Bug c++/79533] New: ICE in build_over_call under -std=c++17 in 'S s(static_cast<S const &>(f()));'

["sbergman at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79533

            Bug ID: 79533
           Summary: ICE in build_over_call under -std=c++17 in 'S
                    s(static_cast<S const &>(f()));'
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sbergman at redhat dot com
  Target Milestone: ---

At least with a recent GCC trunk build:

> $ g++ --version
> g++ (GCC) 7.0.1 20170214 (experimental)
> Copyright (C) 2017 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> 
> $ cat test.cc
> struct S {};
> S f();
> S s(static_cast<S const &>(f()));
> 
> $ g++ -std=c++17 -fsyntax-only test.cc
> test.cc:3:32: internal compiler error: in build_over_call, at cp/call.c:7978
>  S s(static_cast<S const &>(f()));
>                                 ^
> 0x5c34ec build_over_call
>         ../../src/gcc/cp/call.c:7975
> 0x5c443e build_new_method_call_1
>         ../../src/gcc/cp/call.c:8801
> 0x5c443e build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc, vl_embed>**, tree_node*, int, tree_node**, int)
>         ../../src/gcc/cp/call.c:8870
> 0x5c58c9 build_special_member_call(tree_node*, tree_node*, vec<tree_node*, va_gc, vl_embed>**, tree_node*, int, int)
>         ../../src/gcc/cp/call.c:8399
> 0x74dfe4 expand_default_init
>         ../../src/gcc/cp/init.c:1790
> 0x74dfe4 expand_aggr_init_1
>         ../../src/gcc/cp/init.c:1905
> 0x74ebeb build_aggr_init(tree_node*, tree_node*, int, int)
>         ../../src/gcc/cp/init.c:1643
> 0x5e05df build_aggr_init_full_exprs
>         ../../src/gcc/cp/decl.c:6164
> 0x5e05df check_initializer
>         ../../src/gcc/cp/decl.c:6312
> 0x60aabc cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
>         ../../src/gcc/cp/decl.c:7025
> 0x7090a3 cp_parser_init_declarator
>         ../../src/gcc/cp/parser.c:19389
> 0x709a6c cp_parser_simple_declaration
>         ../../src/gcc/cp/parser.c:12792
> 0x70a825 cp_parser_block_declaration
>         ../../src/gcc/cp/parser.c:12617
> 0x6e33d4 cp_parser_declaration
>         ../../src/gcc/cp/parser.c:12515
> 0x713e6b cp_parser_declaration_seq_opt
>         ../../src/gcc/cp/parser.c:12391
> 0x71414a cp_parser_translation_unit
>         ../../src/gcc/cp/parser.c:4366
> 0x71414a c_parse_file()
>         ../../src/gcc/cp/parser.c:38425
> 0x873ac3 c_common_parse_file()
>         ../../src/gcc/c-family/c-opts.c:1107
> 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.

The ICE happens with -std=c++17/-std=gnu++17, doesn't happen with -std=c++14
etc.  I cannot reproduce it with g++ from gcc-c++-6.3.1-1.fc25.x86_64, but
maybe that one's built without assertions.