Does running a parallel "make -jN check" work safely?

[Kaveh R. Ghazi]

So running the testsuite is taking forever, especially since I like to
use extra passes with -fpic or multilib flags.

I'm wondering whether running "make -jN check" is safe.  I'm
especially concerned about the possibility of the extra passes and
those tests using the same executable name for their output.  If I
could run even -j2 and cut the time in half it would be a vast
improvement.

Thoughts?

		Thanks,
		--Kaveh
--
Kaveh R. Ghazi			ghazi@caip.rutgers.edu