[Bug middle-end/78098] error: interrupt service routine can't be called directly

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78098

--- Comment #16 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Martin Liška from comment #15)
> > 
> > Not with interrupt handler which needs different epilogue and prologue.
> 
> I see, however I'm not sure it's known information when IPA ICF is running.
> Or am I wrong?

The information is available.  But I don't know if ICF should be concerned.
We can disable ICF for interrupt handler or use it as a feature to detect
code duplication for interrupt handler, which I submitted a patch for:

https://gcc.gnu.org/ml/gcc-patches/2016-10/msg02177.html