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Subject:	Re: libmpi_cxx.dll.a missing
To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
References:	<C6C4A713-424D-4A18-A201-1B642759E80E AT gmail DOT com> <e2e57b6b-6d76-75ce-79d6-c2acf0fe8c5e AT gmail DOT com>
From:	Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID:	<08d4e3d4-3175-aabb-376f-09bc5b51ae97@dronecode.org.uk>
Date:	Wed, 29 Aug 2018 12:15:33 +0100
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On 28/08/2018 12:12, Marco Atzeri wrote:
> 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

I believe OpenMPI now has a configuration option, --enable-mpi-cxx, 
which enables these deprecated interfaces to be built.

I was going to ask you if not using that was a deliberate choice, since 
this also breaks a meson test case.

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