[CMake] FindMPI troubles on macOS w/ small reproducer
Zaak Beekman
zbeekman at gmail.com
Mon Oct 29 12:21:00 EDT 2018
Hi All,
It seems to me that there is a bug in FindMPI in the latest CMake and/or in
the Travis-CI macOS (`osx`) environment. Has anyone had success testing
with the latest CMake a C & Fortran application that requires MPI on
Travis-CI osx nodes? (Ideally using GNU compilers all the way.) If you
could share a `.travis.yml` file that shows how you accomplished this, I
would be very grateful.
I'm trying to debug the CI test system for a project I help maintain,
OpenCoarrays. I'm seeing some very strange behavior: Running the build
locally on my macOS machine succeeds without issue. However running the
same build in a Travis-CI.org `osx` environment causes `FindMPI` to fail.
It fails in a strange way, however. It finds all the libraries and sets
`MPI_Fortran_FOUND` to true but `MPI_{C,CXX}_FOUND` to false.
I have setup a pretty simple, and small minimally complete verifiable
example (MCVE) at https://github.com/zbeekman/CMake-mac-travis-MCVE. I have
also added a comment on the kitware gitlab bug tracker:
https://gitlab.kitware.com/cmake/cmake/issues/18139#note_475842. I told
CMake to dump TONS of debug information, but I couldn't spot obvious
issues. If someone could please take a look through the output, e.g., here:
https://travis-ci.com/zbeekman/CMake-mac-travis-MCVE/jobs/154349779 to
figure out why FindMPI is behaving this way, or experiment with my test
repositoryI would appreciate it very much.
The CMake file is super simple:
```CMake
cmake_minimum_required(VERSION 3.4)
project(foo LANGUAGES C CXX Fortran)
find_package( MPI )
if ( (NOT MPI_C_FOUND) OR (NOT MPI_Fortran_FOUND) OR (NOT MPIEXEC))
# Get default install location of MPICH from install.sh
message(WARNING "Could not find all MPI components!")
message(FATAL_ERROR "
MPI_C_FOUND = ${MPI_C_FOUND}
MPI_CXX_FOUND = ${MPI_CXX_FOUND}
MPI_Fortran_FOUND = ${MPI_Fortran_FOUND}
MPIEXEC = ${MPIEXEC}
")
endif()
```
And the [`.travis.yml` file](
https://github.com/zbeekman/CMake-mac-travis-MCVE/blob/master/.travis.yml)
is pretty simple too; it just defines a build matrix with two jobs, one to
test MPICH and one to test OpenMPI both on the `osx` configuration of
Travis-CI. It also has to fix some issues when installing GCC 8.2 vai
homebrew. Then it launches CMake using GNU 8.2 toolchain. The MPI
implementations shipped by homebrew are built using clang, but I really
don't see how this could/should affect finding the C wrapper scripts and
setting `MPI_C_FOUND` to true, since C compilers should produce ABI
compatible C libraries.
Thanks,
Zaak
On Mon, Oct 29, 2018 at 12:00 PM <cmake-request at cmake.org> wrote:
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> 1. Re: CMake script mode not backward compatible? (Brad King)
> 2. Re: TARGET_FILE generator expression and multi-config (i.e.
> VS) (Hendrik Greving)
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>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 29 Oct 2018 11:12:54 -0400
> From: Brad King <brad.king at kitware.com>
> To: Damien R <damienrg+list at gmail.com>, cmake at cmake.org
> Subject: Re: [CMake] CMake script mode not backward compatible?
> Message-ID: <df173172-0d0f-ce5c-3a66-cfe4dde1f84a at kitware.com>
> Content-Type: text/plain; charset=utf-8
>
> On 10/29/2018 04:28 AM, Damien R wrote:
> > Hi,
> >
> > Since cmake 3.10, using cmake in script mode (-P) produce an error with
> the
> > following script:
> >
> > cmake_minimum_required(VERSION 3.9)
> > set_directory_properties(PROPERTIES EXCLUDE_FROM_ALL FALSE)
> >
> > I did not see something related in the release notes of cmake 3.10 so I
> > would like to know if it is a regression, or if I was lucky that it
> worked
> > in cmake prior to 3.10?
>
> It was broken by accident. I've opened an issue:
>
> https://gitlab.kitware.com/cmake/cmake/issues/18523
>
> Please follow progress there.
>
> FWIW, there is little reason to use this command in script mode.
>
> Thanks,
> -Brad
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 29 Oct 2018 08:15:21 -0700
> From: Hendrik Greving <hendrik.greving.smi at gmail.com>
> To: robert.maynard at kitware.com
> Cc: cmake at cmake.org
> Subject: Re: [CMake] TARGET_FILE generator expression and multi-config
> (i.e. VS)
> Message-ID:
> <CABVVhih0c1=
> Y1ZK9kW+-m1P57ijvO6iqvbxWYVHhZk6A1U_ZSw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Subject: $<TARGET_FILE:tgt>
> Thanks
>
> On Mon, Oct 29, 2018 at 7:56 AM Robert Maynard <robert.maynard at kitware.com
> >
> wrote:
>
> > I am not seeing any generator expression
> > On Thu, Oct 25, 2018 at 2:25 PM Hendrik Greving
> > <hendrik.greving.smi at gmail.com> wrote:
> > >
> > > Hi @ll, does the generator expression above add a per-config subdir for
> > multi-config generators?
> > > Thanks in advance
> > > --
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