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From: "jewillco at osl dot iu.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/53845] New: Another "error reporting routines re-entered" issue
Date: Tue, 03 Jul 2012 19:58:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D53845

             Bug #: 53845
           Summary: Another "error reporting routines re-entered" issue
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jewillco@osl.iu.edu


This example causes "Error reporting routines re-entered", and seems to be
different from those reported so far:

struct a {};
template<typename> struct b;
template<> struct b<a> {static const int v =3D 3;};

template <typename L>
struct c {
  static_assert(b<L>::v =3D=3D 3, "");
  using t =3D int;
};
template <typename E, typename T>
auto d(T x) -> decltype(((x.template e<E>()))) {return ((x.template e<E>())=
);}
template <typename B>
struct f {
  template <typename E>
  struct h {
    using w =3D int;
    typename c<E>::t x;
  };
  template <typename E>
  decltype(d<typename h<E>::w>(*(B*)nullptr)) e();
};
struct g {
  template <typename> int e();
};
int main(int argc, char** argv) {
  d<a>(f<g>{});
  return 0;
}

It is probably invalid code.  Some small variations on it cause infinite lo=
ops
(recursion depth exceeded), which also seem to be incorrect.  The full error
message for the code above with 4.7.1 is:

=E2=80=98
Internal compiler error: Error reporting routines re-entered.
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.