[Bug driver/63837] [5 Regression] r217391 causes kernel build errors with GCC_COMPARE_DEBUG=1

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63837

--- Comment #10 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #8)
> I bet this is really the same as bug 63881.  The kernel is using /dev/null
> for both the input and output when testing if the options work.

Andrew, could you try if the patch above fixes bug 63881? If so, I would mark
that one as duplicate of this. I'm waiting for a bootstrap to finish just for
safe-checking, but then I will commit it as obvious.