mpitool
Get MPI build flags from mpicc and mpicxx wrappers.
Usage
mpitool (--link|--compile) mpiwrapper [regex]
Description
The mpitool program replaces the compiler used by the MPI wrapper
with the 'echo' program, and then captures the arguments. The
environment variables like I_MPI_CC or OMPI_CC are used to
run 'echo' as the compiler. Only Openmpi, Intel MPI, and MPICH
are supported by now.
To use with other wrappers, set the compiler to echo, maybe
using a CUSTOM_CC=echo variable, before calling mpitool.
Note: for Intel MPI you can only use mpiicc or mpigcc for the
MPI wrapper, as mpicc doesn't allow other compilers than icc and
gcc. The same occurs for mpiicpc and mpigxx.
Options
--link Calls the mpiwrapper as if it was linking a program,
in order to show the link flags
--compile Calls the mpiwrapper to perform a compilation only,
no linking step.
mpiwrapper The MPI wrapper script, usually mpicc or mpicxx.
regex Optional. Returns only the flags matching this regex.
Flags are placed one per line and then the regex is
applied, so you can filter with ^-L all flags starting
by -L. By default returns all the flags.
Examples
Get the dynamic libraries used at link time for C:
$ mpitool --link mpicc "^-l"
Get all flags given by the wrapper for compilation stage for C++:
$ mpitool --compile mpicxx
It can also be used in a Makefile:
LDFLAGS+=$(shell mpitool --link mpicc "^-L")
LDLIBS+=$(shell mpitool --link mpicc "^-l")
CFLAGS+=$(shell mpitool --compile mpicc "^-I")