Hi Ben,

I believe changing OMPI_DECLSPEC to __declspec(dllexport) inside functions.h will allow the cxx module to build (and export the function) but will break any client using (and thus trying to import) it. OMPI_DECLSPEC should only be defined as __declspec(dllexport) while compiling the cxx module (say when libmpi_cxx_EXPORTS is defined).

Yes, as long as there are more functions to export, they have to be defined in that way. I don't see any option for Intel Compiler to manage this automatically.

BTW, I also noticed that the Intel compiler has issues with the preprocessor definitions for ompi_info "OMPI_CONFIGURE_DATE=\"03:18 PM Wed 04/14/2010 \"" and

"OMPI_BUILD_DATE=\"03:18 PM Wed 04/14/2010 \"". The quotes around the definitions throw it off completely. Is that something that CMake does or do you instruct CMake to do this? Both the Intel and Microsoft compiler work correctly without them.

In which project did you see those preprocessor definitions? Because for me, I don't see them. Actually, they are not used as preprocessors in the whole solution, but they are only some cached variables in CMake. Could you please try to do a clean configuration with CMake, and see if they still exists?





From: users-bounces@open-mpi.org [mailto:users-bounces@open-mpi.org] On Behalf Of Shiqing Fan
Sent: Thursday, April 15, 2010 1:28 PM
To: users@open-mpi.org
Cc: Kuppers, Ben SIEP-PTT/SDRM
Subject: Re: [OMPI users] import/export issues on Windows



It seems Microsoft C++ compiler could recognize what the code wants to do, while Intel C++ compiler couldn't. I know a solution for this kind of problem, but it involves some code base changes,  I need some time to test it. At moment, if you want to use Intel C++ compiler, the dirty solution is just changing "OMPI_DECLSPEC" in ompi/mpi/cxx/functions.h to "__declspec(dllexport)". Or you could switch to use Microsoft compiler only for this libmpi_cxx project.


On 2010-4-15 9:52 AM, Ben.Kuppers@shell.com wrote:



When I use 1.4.2rc1 I am able build in Visual Studio 2005 (CMake 2.6.4 default settings VS2005 x64)but I get the following warning (among others):


11>..\..\..\..\..\ompi\mpi\cxx\intercepts.cc(81) : warning C4273: 'MPI::InitializeIntercepts' : inconsistent dll linkage

11>        E:\source\openmpi-1.4.1\ompi/mpi/cxx/functions.h(64) : see previous definition of 'InitializeIntercepts'


When I convert the Visual Studio projects to use the Intel 10.1 compiler (required for our production environment) this warning becomes an error:


11>E:\source\openmpi-1.4.2rc1\ompi\mpi\cxx\intercepts.cc(80): error: a function declared "dllimport" may not be defined

11>  MPI::InitializeIntercepts()


This issue seems related to http://www.open-mpi.org/community/lists/users/2010/03/12392.php.


It appears to me that you are trying to use a single symbol to import from the c module and export from cxx module at the same time.


Any help would be appreciated,



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Shiqing Fan                          http://www.hlrs.de/people/fan
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Address:Allmandring 30               email: fan@hlrs.de    
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Shiqing Fan                          http://www.hlrs.de/people/fan
High Performance Computing           Tel.: +49 711 685 87234
  Center Stuttgart (HLRS)            Fax.: +49 711 685 65832
Address:Allmandring 30               email: fan@hlrs.de    
70569 Stuttgart