Well this is interesting. The linker can't find that because
MPI::Datatype::Free isn't implemented on the Windows build (in
datatype_inln.h). It's declared in datatype.h though. It's not there
in the Linux version either, so I don't know where the Linux build is
getting that symbol from, that link should fail too. Is the C++ version
of OpenMPI actually broken overall?
The Windows support is another issue. I think it's semi-officially
deprecated.
Damien
On 20/02/2013 11:20 PM, Hartman, Todd W. wrote:
I'm trying to build a simple Open MPI application for Windows. I've installed
the binaries for OpenMPI-v1.6.2 (64-bit). I've also installed Visual Studio
2010. The machine(s) are Windows 7 x64.
When I attempt to compile a simple program that uses MPI::Send(), I get a
linker error saying that it cannot resolve MPI::Datatype::Free().
Here's a minimal example:
---------------------------------------------------
#include <mpi.h>
#include <iostream>
int main( int argc, char** argv ) {
MPI::Init(argc,argv);
// Meant to run with 2 processes.
if (MPI::COMM_WORLD.Get_rank() == 0) {
int data;
MPI::COMM_WORLD.Recv(&data,1,MPI_INT,1,0);
std::cout << "received " << data << std::endl;
} else {
int data = 0xdead;
std::cout << "sending " << data << std::endl;
MPI::COMM_WORLD.Send(&data,1,MPI_INT,0,0);
}
MPI::Finalize();
}
---------------------------------------------------
When I compile it:
mpic++ send_compile.cpp -o send_compile.exe -DOMPI_IMPORTS -DOPAL_IMPORTS
-DORTE_IMPORTS
---------------------------------------------------
Microsoft (R) C/C++ Optimizing Compiler Version 16.00.40219.01 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
cl : Command line warning D9035 : option 'o' has been deprecated and will be
removed in a future release
send_compile.cpp
Microsoft (R) Incremental Linker Version 10.00.40219.01
Copyright (C) Microsoft Corporation. All rights reserved.
/out:send_compile.exe
/out:send_compile.exe
"/LIBPATH:C:\Program Files (x86)\OpenMPI_v1.6.2-x64/lib"
libmpi_cxx.lib
libmpi.lib
libopen-pal.lib
libopen-rte.lib
advapi32.lib
Ws2_32.lib
shlwapi.lib
send_compile.obj
send_compile.obj : error LNK2001: unresolved external symbol "public: virtual void
__cdecl MPI::Datatype::Free(void)" (?Free@Datatype@MPI@@UEAAXXZ)
send_compile.exe : fatal error LNK1120: 1 unresolved externals
---------------------------------------------------
This program compiles and runs without complaint on an Ubuntu machine around
here. I don't know what the problem is. Open MPI's documentation didn't say
anything about adding the CPP defines (OMPI_IMPORTS, OPAL_IMPORTS,
ORTE_IMPORTS) whose absence were causing other linker errors similar to this.
Google found some items in the mailing list archive. I cannot find any
information about this particular problem, though.
I tried using dumpbin to get symbols that were in the .lib files installed by
MPI, but didn't find any reference to that function name. I didn't find any
answers looking in the MPI headers, either.
I have a similar program in C that compiles and runs fine on this Windows
machine. I don't know what I'm doing wrong with C++. Can someone point me in
the right direction? Is there some documentation regarding getting things to
work on Windows? The release notes don't address this problem, and I can't find
any other documentation related to what might be different from *nix to Windows
(WRT to Open MPI).
Thanks.
todd.
P.S. This is copied from a StackOverflow question I posted
(http://stackoverflow.com/questions/14988099/open-mpi-c-link-error-mpidatatypefree-on-windows).
Forgive the cross-posting.
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