Closed
Description
Description
The compiler flags used by fpm when building with the Intel oneAPI compiler prevent the successful build of MPI-parallelized code using IntelMPI.
To reproduce:
Create a standard fpm project with
fpm new test
modify fpm.toml to contain
[fortran]
implicit-typing = true
implicit-external = true
source-form = "free"
[dependencies]
mpi = "*"
and modify the library source file as follows
module test
use mpi_f08, only : MPI_COMM_WORLD, mpi_barrier, mpi_init, mpi_finalize
implicit none
private
public :: say_hello
contains
subroutine say_hello
call mpi_init()
call MPI_Barrier(MPI_COMM_WORLD)
print *, "Hello, test!"
call mpi_finalize()
end subroutine say_hello
end module test
and build it with
FPM_FC=ifx fpm build
Using ifx (IFX) 2024.1.0 20240308 I obtain the error message:
ld: build/ifx_434F714D4D7C6A1A/test/libtest.a(src_test.f90.o): in function `test_MP_say_hello_':
/media/aradi/ramdisk/test/././src/test.f90:10:(.text+0x2c): undefined reference to `mpi_f08_compile_constants_MP_mpi_comm_world_'
ld: build/ifx_434F714D4D7C6A1A/test/libtest.a(src_test.f90.o):(.debug_info+0x3e): undefined reference to `mpi_f08_compile_constants_MP_mpi_comm_world_'
Expected Behaviour
It would be desirable, especially for less experienced programmers, that MPI-parallel code compiles with the oneAPI compiler automatically,
Version of fpm
0.10.1, alpha
Platform and Architecture
Linux
Additional Information
The culprit is the -standard-semantics option. Using this option changes the name mangling, and the IntelMPI fortran modules apparently use the "original" name mangling. Issuing
FPM_FC=ifx FPM_FFLAGS="-standard-semantics" fpm build
generates the same error. Using
FPM_FC=ifx FPM_FFLAGS="-stand f18" fpm build
instead leads to a successful build