Bug 1525304

+++ This bug was initially created as a clone of Bug #1516576 +++

Description of problem:

Whilst compiling ceph we encountered an ICE. I was able to reduce it to the following. Note this is different to the reproducer in the gcc bug report identified below but involves similarly nested classes.

$ cat << EOF >reproducer.ii
template <typename a> struct b { a c; };
template <typename d> struct e { d *operator->(); };
template <typename d> class f {
public:
  typedef e<d> g;
};
class h {
protected:
  h(int);
};
class j {
public:
  virtual ~j();
  struct k : h {
    int l;
    k() : h(l) {
      struct m : j {
        m() {}
      };
    }
  };
};
struct n {
  n() {
    for (f<b<b<j *>>>::g i;;)
      delete i->c.c;
  }
};
void o() { n(); }
EOF
$ g++ -c -O2 -g reproducer.ii                                                                                                                                                                                     
reproducer.ii: In destructor ‘virtual j::k::k()::m::~m()’:
reproducer.ii:17:14: internal compiler error: in force_type_die, at dwarf2out.c:25128
       struct m : j {
              ^

Version-Release number of selected component (if applicable):
gcc-7.2.1-2.fc27.x86_64

How reproducible:
100%

Actual results:
internal compiler error

Expected results:
Successful compile

Additional info:
This is the linked gcc bug 82155.
Currently we are having to build with a gcc package including this patch which resolves the issue, https://github.com/gcc-mirror/gcc/commit/c7db9cf55ae4022f134624db81cc70d694079b6c

Giving this high severity as it is adversely affecting the ceph build system.