[Bug tree-optimization/107467] Miscompilation involing -Os , -flto and -fno-strict-aliasing

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107467

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is the unincluded version of the source:
#include <utility>

template <typename C>
bool __attribute__((noinline))
compare_pairs(const std::pair<int, C> &lhs, const std::pair<int, C> &rhs) {
  return lhs.first == rhs.first && lhs.second == rhs.second;
}

template <typename B> struct Combined {
  std::pair<int, B *> __attribute__((noinline)) get_const() {
    return std::make_pair(123, nullptr);
  }
  bool __attribute__((noinline)) clashy() {
    return compare_pairs(get_const(), get_const());
  }
};

class SomeClass {};
class OtherClass {};

void some_func() {
  Combined<SomeClass> myvar;
  __builtin_printf("%i\n", myvar.clashy());
}

void other_func() {
  Combined<OtherClass> myvar;
  __builtin_printf("%i\n", myvar.clashy());
}