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Subject:	Re: libmpi_cxx.dll.a missing
To:	cygwin AT cygwin DOT com
References:	<C6C4A713-424D-4A18-A201-1B642759E80E AT gmail DOT com>
From:	Marco Atzeri <marco DOT atzeri AT gmail DOT com>
Message-ID:	<e2e57b6b-6d76-75ce-79d6-c2acf0fe8c5e@gmail.com>
Date:	Tue, 28 Aug 2018 13:12:57 +0200
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Am 28.08.2018 um 11:24 schrieb Antonio Pio Rinaldi:
> Hello,
>
> while trying to compile a code with cmake (GNU compiler 7.4 and cmake 3.6, latest cygwin), I got an error regarding mpicxx not being able to locate the library -lmpi_cxx.
> This was kind of weird, as I had installed the same code in another machine some time ago (with GNU compiler 6.4 and cmake 3.3, cygwin version 2.8) and did not have this issue.
>
> Then by navigating to the cygwin lib folder, I noticed that the file libmpi_cxx.dll.a was missing in the latest version (although the package Libs/libopenmpicxx1 seems to be installed).
>
> After copying the library file from the previous version I am able to correctly install my code.
>
> I am not sure whether this is a bug, or if I have to set up something else to let cygwin install the mpicxx library.
>
> Regards,
> Antonio Pio Rinaldi

The C++ interface was removed on the upstream version of OpenMPI.

https://blogs.cisco.com/performance/the-mpi-c-bindings-what-happened-and-why

The suggested solution is to use the C interface

Regards
Marco


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