[Bug c++/60683] confused by earlier errors, bailing out on incorrect std::initializer_list

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60683

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-03-27
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The code has undefined behaviour, you are not allowed to add declarations to
namespace std, especially not std::initializer_list which is very closely tied
to the compiler.

On trunk we get the following stack trace:


il.cc: In function ‘int test()’:
il.cc:16:23: error: converting to ‘X’ from initializer list would use explicit
constructor ‘X::X(std::initializer_list<int>)’
     X x  = {10, 10, 10};
                       ^
il.cc:16:23: internal compiler error: Segmentation fault
0xb5682f crash_signal
        /home/jwakely/src/gcc/gcc/gcc/toplev.c:337
0x553bd9 contains_struct_check
        /home/jwakely/src/gcc/gcc/gcc/tree.h:2826
0x553bd9 convert_like_real
        /home/jwakely/src/gcc/gcc/gcc/cp/call.c:6129
0x555121 build_over_call
        /home/jwakely/src/gcc/gcc/gcc/cp/call.c:7010
0x5537ec convert_like_real
        /home/jwakely/src/gcc/gcc/gcc/cp/call.c:6032
0x55310c convert_like_real
        /home/jwakely/src/gcc/gcc/gcc/cp/call.c:6162
0x558196 perform_implicit_conversion_flags(tree_node*, tree_node*, int, int)
        /home/jwakely/src/gcc/gcc/gcc/cp/call.c:9091
0x6a3617 ocp_convert(tree_node*, tree_node*, int, int, int)
        /home/jwakely/src/gcc/gcc/gcc/cp/cvt.c:863
0x6b0c0d expand_default_init
        /home/jwakely/src/gcc/gcc/gcc/cp/init.c:1618
0x6b0c0d expand_aggr_init_1
        /home/jwakely/src/gcc/gcc/gcc/cp/init.c:1787
0x6b33aa build_aggr_init(tree_node*, tree_node*, int, int)
        /home/jwakely/src/gcc/gcc/gcc/cp/init.c:1538
0x566e6c build_aggr_init_full_exprs
        /home/jwakely/src/gcc/gcc/gcc/cp/decl.c:5591
0x566e6c check_initializer
        /home/jwakely/src/gcc/gcc/gcc/cp/decl.c:5726
0x579d75 cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        /home/jwakely/src/gcc/gcc/gcc/cp/decl.c:6394
0x66bcff cp_parser_init_declarator
        /home/jwakely/src/gcc/gcc/gcc/cp/parser.c:16858
0x66d5fe cp_parser_simple_declaration
        /home/jwakely/src/gcc/gcc/gcc/cp/parser.c:11225
0x651c00 cp_parser_block_declaration
        /home/jwakely/src/gcc/gcc/gcc/cp/parser.c:11106
0x652cc0 cp_parser_declaration_statement
        /home/jwakely/src/gcc/gcc/gcc/cp/parser.c:10753
0x653327 cp_parser_statement
        /home/jwakely/src/gcc/gcc/gcc/cp/parser.c:9486
0x6540ae cp_parser_statement_seq_opt
        /home/jwakely/src/gcc/gcc/gcc/cp/parser.c:9764
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