[Bug c++/71576] New: ICE on valid C++11 code (with xvalue and bitfield) on x86_64-linux-gnu: in build_target_expr, at cp/tree.c:385

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71576

            Bug ID: 71576
           Summary: ICE on valid C++11 code (with xvalue and bitfield) on
                    x86_64-linux-gnu: in build_target_expr, at
                    cp/tree.c:385
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

The following C++11 code causes an ICE when compiled with the current GCC trunk
on x86_64-linux-gnu in both 32-bit and 64-bit modes.  

This is a regression from 6.1.x.


$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160617 (experimental) [trunk revision 237557] (GCC) 
$ 
$ g++-6.1 -c small.cpp
$ 
$ g++-trunk -c small.cpp
small.cpp: In function ‘void foo()’:
small.cpp:10:26: internal compiler error: in build_target_expr, at
cp/tree.c:385
   int &&j = foo < A > ().i;
                          ^
0x83597f build_target_expr
        ../../gcc-source-trunk/gcc/cp/tree.c:379
0x66d066 convert_like_real
        ../../gcc-source-trunk/gcc/cp/call.c:6769
0x67934b initialize_reference(tree_node*, tree_node*, int, int)
        ../../gcc-source-trunk/gcc/cp/call.c:10054
0x688224 grok_reference_init
        ../../gcc-source-trunk/gcc/cp/decl.c:5186
0x688224 check_initializer
        ../../gcc-source-trunk/gcc/cp/decl.c:6085
0x6b1c0d cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc-source-trunk/gcc/cp/decl.c:6851
0x7ac1a7 cp_parser_init_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:18697
0x7ac9d9 cp_parser_simple_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12378
0x7acce1 cp_parser_block_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12246
0x7ad738 cp_parser_declaration_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:11858
0x7aa30b cp_parser_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10526
0x7aac2c cp_parser_statement_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:10804
0x7aad1f cp_parser_compound_statement
        ../../gcc-source-trunk/gcc/cp/parser.c:10758
0x7aaecf cp_parser_function_body
        ../../gcc-source-trunk/gcc/cp/parser.c:20696
0x7aaecf cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc-source-trunk/gcc/cp/parser.c:20732
0x7ab971 cp_parser_function_definition_after_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:25415
0x7ac685 cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:25327
0x7ac685 cp_parser_init_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:18468
0x7ac9d9 cp_parser_simple_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12378
0x7acce1 cp_parser_block_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12246
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.
$ 


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


template < typename T > T && foo ();

struct A 
{
  int i:5;
};

void foo ()
{
  int &&j = foo < A > ().i;
}