[Bug ipa/105728] dead store to static var not optimized out

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105728

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, any such optimization would be prone to remove 'debug_cnt' in

void foo()
{
  static int debug_cnt = 0;
  debug_cnt++;
  .. stuff ..
}

because here nothing depends on debug_cnt.  For some printf-style
debugging that might be surprising.  It of course already happens for

void foo()
{
  static bool ever_reached = false;
  ever_reached = true;
}