[Bug c++/82159] [6 Regression] ICE: in assign_temp, at function.c:961

[chr at terma dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82159

--- Comment #12 from chr at terma dot com ---
I've build a gcc 7.2.0 + above patch using crosstool ng. The original test code
passes, so I should have managed to succesfully create a patches gcc. 

Steps to Repro:
-----------------

g++ -c -O0 testcase2.cpp
testcase2.cpp: In constructor 'bd< <template-parameter-1-1> >::bg<bf>::bg(bd<
<template-parameter-1-1> >::bb, bf) [with bf = l; <template-parameter-1-1> =
bc<2, double>]':
testcase2.cpp:37:31: internal compiler error: in assign_temp, at function.c:968
     bg(bb, bf n) : bh(n.ap - 0) {}


Source file testcase2.cpp:
-------------

template <typename b> class d { b e; };
class f : d<int[0]> {
public:
  f(const f &);
};
class g : f {
public:
  template <class h> g operator-(h);
};
template <class ai> class i {
public:
  typedef typename ai::template j<i> ak;
};
template <class al> class k { typename i<al>::ak an; };
class l {
public:
  g ap;
};
class aq {
public:
  ~aq();
};
template <class ar> class m : ar {
public:
  template <typename at, typename au> m(at, au);
  l av;
  virtual void aw() { ar::ax(&av); }
};
template <int, typename> class bc;
template <class> class bd {
public:
  typedef int bb;
  class be {};
  template <class bf> class bg {
  public:
    g bh;
    bg(bb, bf n) : bh(n.ap - 0) {}
  };
  bd(bb, be);
};
template <typename> class o;
template <int az, typename bl>
class o<bd<bc<az, bl>>> : public bd<bc<az, bl>>::be {};
class L : bd<bc<2, double>> {
  class p : aq {
  public:
    void ax(l *p1) {
      bb a;
      bg<l>(a, *p1);
    }
  };

public:
  template <typename at, typename au> L(at p1, au n) : bd(p1, n) {}
  int br;
  virtual int bs() { m<p>(this, br); }
};
template <typename> class q {
  o<bd<bc<2, double>>> bv;
  virtual L bw() { L(0, bv); }
};
template <template <class> class by> class r {
public:
  r() { by<int>(); }
};
class s {
public:
  template <class> class j : r<q> {};
};
void t() { k<s> c; }

int main() {
return 0;
}

Compiler used:
-----------------
x86_64-corei7_avx-linux-gnu-g++ -v
Using built-in specs.
COLLECT_GCC=x86_64-corei7_avx-linux-gnu-g++
COLLECT_LTO_WRAPPER=/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/x86_64-corei7_avx-linux-gnu/libexec/gcc/x86_64-corei7_avx-linux-gnu/7.2.0/lto-wrapper
Target: x86_64-corei7_avx-linux-gnu
Configured with:
/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/.build/x86_64-corei7_avx-linux-gnu/src/gcc/configure
--build=x86_64-build_pc-linux-gnu --host=x86_64-build_pc-linux-gnu
--target=x86_64-corei7_avx-linux-gnu
--prefix=/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/x86_64-corei7_avx-linux-gnu
--with-sysroot=/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/x86_64-corei7_avx-linux-gnu/x86_64-corei7_avx-linux-gnu/sysroot
--enable-languages=c,c++ --with-arch=corei7-avx --with-tune=corei7-avx
--with-pkgversion='crosstool-NG
astrax_ASTRAX_902085-002_REL_A-2760-gc1aa3992abc-dirty' --enable-__cxa_atexit
--disable-libmudflap --disable-libgomp --disable-libssp --disable-libquadmath
--disable-libquadmath-support --disable-libsanitizer --enable-libmpx
--with-gmp=/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/.build/x86_64-corei7_avx-linux-gnu/buildtools
--with-mpfr=/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/.build/x86_64-corei7_avx-linux-gnu/buildtools
--with-mpc=/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/.build/x86_64-corei7_avx-linux-gnu/buildtools
--with-isl=/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/.build/x86_64-corei7_avx-linux-gnu/buildtools
--enable-lto --with-host-libstdcxx='-static-libgcc
-Wl,-Bstatic,-lstdc++,-Bdynamic -lm' --enable-threads=posix
--enable-target-optspace --disable-plugin --disable-nls --disable-multilib
--with-local-prefix=/home/ries/work/build/tools/x86_64/gcc-7.2.0-glibc-2.25-x86_64/x86_64-corei7_avx-linux-gnu/x86_64-corei7_avx-linux-gnu/sysroot
--enable-long-long
Thread model: posix
gcc version 7.2.0 (crosstool-NG gc1aa3992abc-dirty)