Magic incantation for running multilib testsuite.

[Ben Elliston]

On Sun, 2008-01-27 at 00:17 +0100, Matthias Klose wrote:

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

I always refer to this snippet in gcc/Makefile.in to remind myself:

# The idea is to parallelize testing of multilibs, for example:
#   make -j3 check-gcc//sh-hms-sim/{-m1,-m2,-m3,-m3e,-m4}/{,-nofpu}
# will run 3 concurrent sessions of check-gcc, eventually testing
# all 10 combinations.  GNU make is required, as is a shell that expands
# alternations within braces.

Ben