[Bug c++/67337] [4.9/5/6 Regression] Segmentation fault on a template class

["trippels at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67337

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-08-24
                 CC|                            |trippels at gcc dot gnu.org
            Summary|Segmentation fault on a     |[4.9/5/6 Regression]
                   |template class              |Segmentation fault on a
                   |                            |template class
     Ever confirmed|0                           |1

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
markus@x4 tmp % cat UserTableSync.ii
template <class> class A
{
  void m_fn1 (int *, int);
};

template <class> class B
{
public:
  typedef int Type;
};

template <class> class C
{
public:
  C (int);
  template <template <class> class T> void m_fn2 (typename T<void>::Type);
};

template <>
void
A<int>::m_fn1 (int *, int)
{
  C<int> a (0);
  a.m_fn2<B> (0);
}

markus@x4 tmp % g++ -c UserTableSync.ii
UserTableSync.ii: In instantiation of âvoid C< <template-parameter-1-1>
>::m_fn2(typename T<void>::Type) [with T = B; <template-parameter-1-1> = int]â:

UserTableSync.ii:16:44: internal compiler error: Segmentation fault
   template <template <class> class T> void m_fn2 (typename T<void>::Type);
                                            ^
0xc7b7df crash_signal
        ../../gcc/gcc/toplev.c:352
0x7fb2417d470f ???
        /var/tmp/glibc/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x7a970e write_template_prefix
        ../../gcc/gcc/cp/mangle.c:1152
0x7a9277 write_prefix
        ../../gcc/gcc/cp/mangle.c:1067
0x7a9bd5 write_nested_name
        ../../gcc/gcc/cp/mangle.c:998
0x7a5aa7 write_type
        ../../gcc/gcc/cp/mangle.c:2010
0x7a7c34 write_method_parms
        ../../gcc/gcc/cp/mangle.c:2591
0x7a7fe0 write_bare_function_type
        ../../gcc/gcc/cp/mangle.c:2533
0x7aa239 mangle_decl_string
        ../../gcc/gcc/cp/mangle.c:3500
0x7aa499 get_mangled_id
        ../../gcc/gcc/cp/mangle.c:3522
0x7aa499 mangle_decl(tree_node*)
        ../../gcc/gcc/cp/mangle.c:3589
0xeef7d0 decl_assembler_name(tree_node*)
        ../../gcc/gcc/tree.c:658
0x8eceac symbol_table::insert_to_assembler_name_hash(symtab_node*, bool)
        ../../gcc/gcc/symtab.c:157
0x8ee70c symbol_table::symtab_initialize_asm_name_hash()
        ../../gcc/gcc/symtab.c:249
0x9043d2 analyze_functions
        ../../gcc/gcc/cgraphunit.c:1175
0x9044d0 symbol_table::finalize_compilation_unit()
        ../../gcc/gcc/cgraphunit.c:2477
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