[Bug c++/70386] New: ICE with -Wall on valid code on x86_64-linux-gnu in verify_ctor_sanity, at cp/constexpr.c:2232

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70386

            Bug ID: 70386
           Summary: ICE with -Wall on valid code on x86_64-linux-gnu in
                    verify_ctor_sanity, at cp/constexpr.c:2232
           Product: gcc
           Version: 6.0
            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 code causes an ICE when compiled with the current GCC trunk with
-Wall on x86_64-linux-gnu in both 32-bit and 64-bit modes.  

This is a regression from 5.3.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/6.0.0/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 6.0.0 20160323 (experimental) [trunk revision 234418] (GCC) 
$ 
$ g++-trunk small.cpp
$ g++-5.3 -Wall small.cpp
$                              
$ g++-trunk -Wall small.cpp
small.cpp: In function ‘int main()’:
small.cpp:14:20: internal compiler error: in verify_ctor_sanity, at
cp/constexpr.c:2232
   return (cp () == d);
                    ^
0x845875 verify_ctor_sanity
        ../../gcc-source-trunk/gcc/cp/constexpr.c:2232
0x852643 cxx_eval_bare_aggregate
        ../../gcc-source-trunk/gcc/cp/constexpr.c:2257
0x84d924 cxx_eval_constant_expression
        ../../gcc-source-trunk/gcc/cp/constexpr.c:3699
0x851fa9 cxx_eval_component_reference
        ../../gcc-source-trunk/gcc/cp/constexpr.c:1954
0x84e2dc cxx_eval_constant_expression
        ../../gcc-source-trunk/gcc/cp/constexpr.c:3670
0x8538f9 cxx_eval_outermost_constant_expr
        ../../gcc-source-trunk/gcc/cp/constexpr.c:3947
0x8565bc maybe_constant_value_1
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4135
0x8565bc maybe_constant_value(tree_node*, tree_node*)
        ../../gcc-source-trunk/gcc/cp/constexpr.c:4156
0x779c36 cp_build_binary_op(unsigned int, tree_code, tree_node*, tree_node*,
int)
        ../../gcc-source-trunk/gcc/cp/typeck.c:5096
0x77b747 cp_build_binary_op(unsigned int, tree_code, tree_node*, tree_node*,
int)
        ../../gcc-source-trunk/gcc/cp/typeck.c:4729
0x623d3a build_new_op_1
        ../../gcc-source-trunk/gcc/cp/call.c:5782
0x624d4e build_new_op(unsigned int, tree_code, int, tree_node*, tree_node*,
tree_node*, tree_node**, int)
        ../../gcc-source-trunk/gcc/cp/call.c:5827
0x766322 build_x_binary_op(unsigned int, tree_code, tree_node*, tree_code,
tree_node*, tree_code, tree_node**, int)
        ../../gcc-source-trunk/gcc/cp/typeck.c:3866
0x740946 cp_parser_binary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8923
0x7410a0 cp_parser_assignment_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9055
0x743979 cp_parser_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:9222
0x73504e cp_parser_primary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:4878
0x736816 cp_parser_postfix_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:6690
0x73f95c cp_parser_unary_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:7988
0x7401b7 cp_parser_cast_expression
        ../../gcc-source-trunk/gcc/cp/parser.c:8665
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.
$ 


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


struct A { void f () {} };
struct B : public A {};
struct C : public A {};
struct D : public B, public C {};

typedef void (C::*cp) ();
typedef void (D::*dp) ();

int
main ()
{
  cp c = &A::f;
  dp d = c;
  return (cp () == d); 
}