meson: unable to find mpiifort

[dguibert]

Got this when trying to configure with intel-mpi@2019.7.217 and intel@19.1.1.217 and meson@0.55.3 (and newer 0.61.2)

mpiifort binary missing from cross or native file, or env var undefined.
Trying a default mpiifort fallback at mpiifort
mpiifort found: NO
Run-time dependency MPI for fortran found: NO (tried config-tool and system)

../meson.build:130:2: ERROR: Dependency "mpi" not found, tried config-tool and system

Do you know how to debug this?
@matsbn, @monsieuralok or others

a simple project as following fails:

project('mpitest', 'fortran')
dependency('mpi', language: 'fortran')

[monsieuralok]

@nordmoen please could you reply regarding meson build.

[nordmoen]

Hi, there seems to be some peculiarities in how Meson detects Intel MPI.

Use the following to get it to work:

$ FC=ifort I_MPI_F90=mpifort meson setup builddir

---

Just wanted to note as well, excellent issue @dguibert, it is super helpful with a small reproducible example!

[dguibert]

As you pointed out, Meson is broken detecting Intel MPI. As mentionned if I_MPI_F90 is set to mpiifort itself, it enters in a infinite loop since the wrapper is calling himself.

So I_MPI_F90 should be unset.

I really don't understand, the example works on Betzy, not on another cluster: same compiler and mpi version.

[nordmoen]

Don't know if you tried, but i set I_MPI_F90 to mpifort and not mpiifort

[dguibert]

On betzy, with module iimpi/2020a, mpifort is not found (Or I miss something).

I found the problem on the other cluster, the installation of Intel compilers defines custom options in ifort.cfg: -Xlinker -rpath=..., so ifort -v shows:

ifort version 19.1.1.217
ld    /usr/lib/gcc/x86_64-redhat-linux/8/../../../../lib64/crt1.o /usr/lib/gcc/x86_64-redhat-linux/8/../../../../lib64/crti.o /usr/lib/gcc/x86_64-redhat-linux/8/crtbegin.o --eh-frame-hdr --build-id -dynamic-linker /lib64/ld-linux-x86-64.so.2 -m elf_x86_64 -plugin /scratch/users/dguibert/s1-call3-blom/spack/opt/spack/linux-rhel8-x86_64/gcc-8.4.1/intel-19.1.1-q5oonts7ruca2ocddtunnb27v473xtdf/compilers_and_libraries_2020.1.217/linux/bin/intel64/../../lib/LLVMgold.so -o a.out [...]/compilers_and_libraries_2020.1.217/linux/compiler/lib/intel64 -Bdynamic -Bstatic -lifport -lifcoremt -limf -lsvml -Bdynamic -lm -Bstatic -lipgo -lirc -Bdynamic -lpthread -Bstatic -lsvml -Bdynamic -lc -lgcc -lgcc_s -Bstatic -lirc_s -Bdynamic -ldl -lc /usr/lib/gcc/x86_64-redhat-linux/8/crtend.o /usr/lib/gcc/x86_64-redhat-linux/8/../../../../lib64/crtn.o
/scratch/users/dguibert/s1-call3-blom/spack/opt/spack/linux-rhel8-x86_64/gcc-8.4.1/intel-19.1.1-q5oonts7ruca2ocddtunnb27v473xtdf/compilers_and_libraries_2020.1.217/linux/compiler/lib/intel64_lin/for_main.o: In function `main':
for_main.c:(.text+0x2e): undefined reference to `MAIN__'

and exits with error code 1 which breaks Meson find_external_program in find_config from configtool class.

[nordmoen]

Sorry I was testing with iompi, indeed with iimpi it is mpiifort.