When complete, this Pull Request (PR) will address #929 by making it possible for a project to build alternatively with or without the Message Passing Interface ([MPI]) wrappers.
To Do
Change fpm' behavior so that when the manifest [dependencies] block contains mpi = "*", fpm builds with the MPI wrappers and links to the MPI bindings only when
the --compiler argument is mpifort, mpif90, or mpif77.
[x] Use MPI compiler wrappers only when the above condition is met and
[ ] Treat mpi as a metapackage only when the above condition is met.
The first commit in this PR accomplishes the first checked item above. To see this capability in action, one can start a new fpm project via fpm new optional-mpi and then adding the following lines to the manifest optional-mpi/fpm.toml:
[dependencies]
mpi = "*"
At the time of creating this daft PR, when the use of MPI is removed by a C-preprocessor macro such as in
#ifndef NO_MPI
use mpi_f08
#endif
building with the mpi = '*" terminates with an error
<ERROR> *cmd_run* Targets error: Unable to find source for module dependency: "mpi_f08" used by "././src/optional.F90"
STOP 1
because fpm parses files for internal dependencies before running the preprocessor.
When complete, this Pull Request (PR) will address #929 by making it possible for a project to build alternatively with or without the Message Passing Interface ([MPI]) wrappers.
To Do
Change
fpm' behavior so that when the manifest [dependencies] block containsmpi = "*",fpmbuilds with the MPI wrappers and links to the MPI bindings only when the--compilerargument ismpifort,mpif90, ormpif77.mpias a metapackage only when the above condition is met.The first commit in this PR accomplishes the first checked item above. To see this capability in action, one can start a new
fpmproject viafpm new optional-mpiand then adding the following lines to the manifestoptional-mpi/fpm.toml:At the time of creating this daft PR, when the use of MPI is removed by a C-preprocessor macro such as in
building with the
mpi = '*"terminates with an errorbecause
fpmparses files for internal dependencies before running the preprocessor.