[Bug c++/79249] Lambda call does not create exception handler.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79249

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:

template <typename FnT>
auto attempt(FnT f)
{
  return [f]() 
  {
    try
    {
      f();
    }
    catch(...) 
    {
      __builtin_puts("caught");
    }
  };
}

// More complex behavior does not seem to matter here, however
// removing "noexcept" results in GCC generating a program that works as
expected:
void f_ident() noexcept { }

// Even though this is not actually referenced by the other code, removing 
// it causes GCC to generate a program that works as expected (the presence of
// "static" seems to make no difference).
auto test_attempt_call_with_exception_handler()
{
 static auto fn_ = attempt(f_ident);
 return fn_();
}

void g()
{
  throw 1;
}

int main()
{
 auto f = attempt(g);

 f();
}