I'm converting a pre-existing codebase to automake and friends from raw
GNU make.
The existing setup needed a mix of MPI and non-MPI code. For those not
familiar, (generally) one compiles MPI code using a special frontend,
e.g. 'mpicc', which then forwards to the system compiler. To work with
this, I named any file in my tree that needed MPI as "whatever.mpi.c"
instead of simple "whatever.c". Then I defined a custom pattern rule:
%.mpi.o: %.mpi.c
$(MPICC) -c $(CFLAGS) $^ -o $@
I unfortunately cannot replicate this setup with automake. It seems
the generated makefile does not know of the rule if I included it as-is
in my .am file. I get:
make: *** No rule to make target `netz.mpi.lo', needed by `libnetz.la'. Stop.
(I am using libtool as well; this is a pkglib_LTLIBRAR...y) I can't
get a suffix rule to work as-is, perhaps due to all the '.'s. I tried
changing it to a '-' and using:
SUFFIXES = -mpi.o
-mpi.o.c:
$(MPICC) -c $(CFLAGS) $^ -o $@
to no avail.
I have seen a variety of solutions in the archives that involve
undesirable solutions such as multiple configure scripts. Could anyone
see how to achieve the above solution? If it helps, I am perfectly
okay with requiring GNU make.
Thanks,
-tom
