[CMake] FindMPI.cmake in 3.11.4

[Burlen Loring]

Of course I read the documentation. Alas after trying various settings 
described there in, nothing worked. my settings are ignored and erased.

why did they MPI_C_LIBRARIES and MPI_C_INCLUDE_DIRS/PATH get changed 
from cache variables to not chached variables? that seems to be the 
cause of the issue.  Now how does one override the detection and tell it 
what to use in the new module?

Burlen

On 09/14/2018 10:32 AM, Chuck Atkins wrote:
> Hi Burlen,
> _LIBRARIES and _INCLUDE_DIRS are non-cached output variables.  The new 
> functionality should be documented as to how to guide the current 
> FindMPI: 
> https://cmake.org/cmake/help/v3.12/module/FindMPI.html#variables-for-locating-mpi 
> .  That being said, is it incorrectl6y detecting or determine the MPI 
> installation?  If that's the case then we should probably fix that 
> issue instead.
>
> ----------
> Chuck Atkins
> Staff R&D Engineer, Scientific Computing
> Kitware, Inc.
> (518) 881-1183
>
>
> On Thu, Sep 13, 2018 at 4:46 PM Burlen Loring <burlen.loring at gmail.com 
> <mailto:burlen.loring at gmail.com>> wrote:
>
>     Hi,
>
>     I'm trying to transition from cmake 3.8.2 to cmake 3.11.4. There
>     are a
>     number of changes the way FindMPI.cmake behaves in 3.11 that are
>     making
>     this difficult.
>
>     In 3.11 how do I override the settings? For instance I want to set
>     MPI_C_LIBRARIES, MPI_C_INCLUDE_DIRS? In 3.8 all I had to do was set
>     those variables myself, before find_package(MPI), and my setting were
>     used. in 3.11 find_package(MPI) ignores, and wipes out my
>     settings, and
>     then fails.
>
>     Isn't it a defacto standard of cmake to be able to override find
>     modules
>     by setting the libraries and include dirs before the module runs?
>
>     Burlen
>
>
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