[CMake] cmake 2.6 and 2.8 find different fortran compilers with MPI?

[Tim Gallagher]

No problem. It sounds like you are going through the exact same pains and questions we went through when we set up our research CFD code with CMake a year ago. 

Likewise, the CC and CXX environment variables control the other compilers, if you use them. It's okay to use gcc or g++ with ifort, so long as ifort is used to link things. But sometimes you may want the entire Intel suite to be used, so you may want to set the CC and CXX variables in your modulefile also. 

Tim 

----- Original Message -----

From: "Eli Ateljevich" <eli at water.ca.gov> 
To: "tim gallagher" <tim.gallagher at gatech.edu> 
Cc: "CMake List" <cmake at cmake.org> 
Sent: Monday, July 2, 2012 6:09:59 PM 
Subject: RE: [CMake] cmake 2.6 and 2.8 find different fortran compilers with MPI? 



Thanks Tim. We do have the module system set up including the compiler, so I’ll make sure it defines FC. 





From: Tim Gallagher [mailto:tim.gallagher at gatech.edu] 
Sent: Monday, July 02, 2012 2:59 PM 
To: Ateljevich, Eli 
Cc: CMake List 
Subject: Re: [CMake] cmake 2.6 and 2.8 find different fortran compilers with MPI? 


If you want it to find a particular compiler always, you should do: 

FC=<ifort or gfortran> cmake ... 

In other words, set the FC environment variable to the desired compiler. 

Likewise, FindMPI will find the first mpicc on your path. If that happens to be the ifort one, that's what you will get. If you have multiple compilers and multiple MPI installations, you might be better off installing the module system (http://linux.die.net/man/1/module) that is commonly used on HPC systems. This way you can ensure that only one installation of what you want is in your environment, and then you don't need to worry about manually setting things or putting things in your path in a particular order. 

Tim 
----- Original Message -----


From: "Eli Ateljevich" <eli at water.ca.gov> 
To: "CMake List" <cmake at cmake.org> 
Sent: Monday, July 2, 2012 5:20:34 PM 
Subject: [CMake] cmake 2.6 and 2.8 find different fortran compilers with MPI? 
Hi, 
I wonder if anyone can help me get a consistent Fortran build out of 2.6 and 2.8.8. I am using CMake 2.6 and 2.8, trying to come up with a compatible build. I had to rob some items from 2.8 to find things like MPI correctly and I have set the policies such that I believe they both use the same FindMPI.cmake. 

For some reason, my 2.6 installation “magically” found the Intel compiler ifort. I never did a set(CMAKE_Fortran_COMPILER). Version 2.8.8 does not do this and defaults to gfortran. The later FindMPI finds an Intel wrapper, not the gfortran version. 

Was this a bug fix or policy change? 
1. If this is a policy, can I manipulate it to make the two builds compatible 
2. What can I do about making the compiler and FindMPI consistent in general, 

Thanks very much, 
Eli 

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