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

["redi at gcc dot gnu.org" <gcc-bugzilla@gcc.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
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
>From gcc-bugs-return-447633-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Mar 27 12:20:57 2014
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Subject: [Bug other/60684] New: [4.9 Regression] cp-demangle.c:2149:13: error:=?UTF-8?Q? ‘gnu_v3_unified_dtor’ undeclared?Date: Thu, 27 Mar 2014 12:20:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60684

            Bug ID: 60684
           Summary: [4.9 Regression] cp-demangle.c:2149:13: error:
                    ‘gnu_v3_unified_dtor’ undeclared
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: danglin at gcc dot gnu.org
              Host: hppa-unknown-linux-gnu
            Target: hppa-unknown-linux-gnu
             Build: hppa-unknown-linux-gnu

gcc-4.6 -c -DHAVE_CONFIG_H -g -O2 -I/usr/include/libiberty -I.
-I../../../gcc/li
biberty/../include  -W -Wall -Wwrite-strings -Wc++-compat -Wstrict-prototypes
-p
edantic  ../../../gcc/libiberty/cp-demangle.c -o cp-demangle.o
yes
checking for gcc-4.6 option to accept ISO C89...
../../../gcc/libiberty/cp-deman
gle.c: In function ‘d_ctor_dtor_name’:
../../../gcc/libiberty/cp-demangle.c:2120:13: error: ‘gnu_v3_unified_ctor’
undec
lared (first use in this function)
../../../gcc/libiberty/cp-demangle.c:2120:13: note: each undeclared identifier
i
s reported only once for each function it appears in
../../../gcc/libiberty/cp-demangle.c:2149:13: error: ‘gnu_v3_unified_dtor’
undec
lared (first use in this function)

Breaks build in stage1.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idT083

--- Comment #22 from dave.anglin at bell dot net ---
On 27-Mar-14, at 5:37 AM, dominiq at lps dot ens.fr wrote:

> Please commit your patch, I'll adjust mine.

Done.

--
John David Anglin    dave.anglin@bell.net