Magic incantation for running multilib testsuite.

[Matthias Klose]

David Daney writes:
> I have tried several times (and failed) to run the GCC testsuite on
> multilib targets (x86-64 and mips64) and have not been able to figure
> out how to get more that a single multilib configuration to be tested. 
> The instructions on http://gcc.gnu.org/install/test.html are not working
> for me.  I think I want something like:
> 
> $ make -k check  RUNTESTFLAGS="--target_board=unix/{,-m32}"

when running with make -j, the testsuite is still run sequentially for
each pass; is there a way to run the passes in parallel?

  Matthias