[Bug c++/71748] New: ICE on valid (?) C++ template code invoking a base destructor: in build_base_path, at cp/class.c:304

["su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71748

            Bug ID: 71748
           Summary: ICE on valid (?) C++ template code invoking a base
                    destructor: in build_base_path, at cp/class.c:304
           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++ code causes an ICE when compiled with the current GCC trunk
on x86_64-linux-gnu in both 32-bit and 64-bit modes.  

It also affects all versions since 4.7.x, but is accepted without any warnings
by 4.6.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 20160703 (experimental) [trunk revision 237949] (GCC)
$
$ g++-4.6 -c -Wall -Wextra -pedantic -std=c++0x small.cpp
$
$ g++-trunk -c small.cpp
small.cpp: In instantiation of âvoid foo() [with int <anonymous> = 0]â:
small.cpp:19:14:   required from here
small.cpp:14:9: internal compiler error: in build_base_path, at cp/class.c:304
   b->~A ();
   ~~~~~~^~
0x7533e9 build_base_path(tree_code, tree_node*, tree_node*, int, int)
        ../../gcc-source-trunk/gcc/cp/class.c:304
0x66a1b1 build_over_call
        ../../gcc-source-trunk/gcc/cp/call.c:7489
0x6763d1 build_new_method_call_1
        ../../gcc-source-trunk/gcc/cp/call.c:8521
0x6763d1 build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
        ../../gcc-source-trunk/gcc/cp/call.c:8591
0x6e687f tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
        ../../gcc-source-trunk/gcc/cp/pt.c:16690
0x6d6cff tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../gcc-source-trunk/gcc/cp/pt.c:15868
0x6d739a tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../gcc-source-trunk/gcc/cp/pt.c:15180
0x6d66f3 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../gcc-source-trunk/gcc/cp/pt.c:15166
0x6d8230 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
        ../../gcc-source-trunk/gcc/cp/pt.c:15351
0x6d4c35 instantiate_decl(tree_node*, int, bool)
        ../../gcc-source-trunk/gcc/cp/pt.c:22095
0x721912 instantiate_pending_templates(int)
        ../../gcc-source-trunk/gcc/cp/pt.c:22214
0x764a45 c_parse_final_cleanups()
        ../../gcc-source-trunk/gcc/cp/decl2.c:4600
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
{ 
  virtual ~A () {}
};

struct B : public A
{ 
  virtual ~B () {}
};

template < int > void foo ()
{ 
  B *b = new B;
  b->~A ();
}

int main ()
{ 
  foo < 0 > ();
  return 0;
}