I want to build a version of OpenMPI v4 to run on a cluster where some 
ranks are IBM POWER (little endian) and other ranks are x86_64. The 
OpenMPI wiki says that I need to define OMPI_ENABLE_HETEROGENEOUS_SUPPORT 
so that structure padding will be inserted as appropriate to make this 
work; but a quick 'grep' in the source code finds that this macro isn't 
used anywhere.

Can I build OpenMPI for such a cluster nowadays ?

T J (Chris) Ward, IBM Research. 
Scalable Data-Centric Computing - IBM Spectrum MPI 
IBM United Kingdom Ltd., Hursley Park, Winchester, Hants, SO21 2JN 
LinkedIn https://www.linkedin.com/in/tjcward/ 
ResearchGate https://www.researchgate.net/profile/Thomas_Ward16 

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