[Bug lto/79587] ICE in streamer_write_gcov_count_stream, at data-streamer-out.c:343 while building Python 3.6.0 with PGO and LTO

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79587

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nathan at gcc dot gnu.org
      Known to work|                            |4.5.4, 4.6.4, 4.7.4, 4.8.5
      Known to fail|                            |4.9.4, 5.4.0, 6.3.0

--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Ok, there's a simple test-case:

unsigned long global = -1099511627775;

unsigned long
__attribute__((noinline))
test(unsigned long v, unsigned long v2)
{
  unsigned long x = v % v2;

  return x;
}

int main(int argc, char **argv)
{
  unsigned long r = 0;

  for (int i = 0; i < 100; i++)
    r += test(argc, global);

  return r;
}

Problem is that we use unsigned long type for instrumentation, but gcoc_type is
a signed type. Thus causing issues. I'll come up with a patch for the PR.