[Bug c++/70271] New: internal compiler error: in dwarf2out_finish, at dwarf2out.c:27346

[matthias.hochsteger at tuwien dot ac.at]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70271

            Bug ID: 70271
           Summary: internal compiler error: in dwarf2out_finish, at
                    dwarf2out.c:27346
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: matthias.hochsteger at tuwien dot ac.at
  Target Milestone: ---

The compiler crashes when creating debug symbols for the given code.

command line:
g++ -c -g testfile.cpp

compiler version: g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/matthias/local/libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --prefix=/usr --disable-multilib
--disable-bootstrap --with-system-zlib --prefix=/home/matthias/local
--enable-languages=c,c++,lto --no-create --no-recursion
Thread model: posix
gcc version 6.0.0 20160317 (experimental) (GCC) 


////////////////////////////////////////////////////////////////
/// Utility functions to convert capture-less lambdas to function pointers
template <typename Function>
struct function_traits
: public function_traits<decltype(&Function::operator())> 
{ };

template <typename ClassType, typename ReturnType, typename... Args>
struct function_traits<ReturnType(ClassType::*)(Args...) const> 
{
  typedef ReturnType (*pointer)(Args...);
  typedef ReturnType return_type;
};

template <typename Function>
typename function_traits<Function>::pointer
FunctionPointer (const Function& lambda) 
{
  return static_cast<typename function_traits<Function>::pointer>(lambda);
}

template <typename Function>
typename function_traits<Function>::return_type
GetReturnValue (Function func) 
{
  typename function_traits<Function>::return_type *dummy;
  return *dummy;
}
////////////////////////////////////////////////////////////////

template <typename T> class ClassFoo {};
template <typename T> void FuncBar () { }

template <> inline void FuncBar<double> ()
{
  typedef void (*func_type)(ClassFoo<double> &);

  // this code fails with
  // internal compiler error: in dwarf2out_finish, at dwarf2out.c:27346
  //   0x9ec27b dwarf2out_finish
  //           ../../gcc/dwarf2out.c:27346
  func_type f1 = FunctionPointer ([](ClassFoo<double> & ref) { });

  // this code is working fine
//   func_type f2 = static_cast<func_type>([](ClassFoo<double>  & self) { });
}