[MPIWG Fortran] Provide Fortran datatypes if Fortran bindings not provided?

Jeff Hammond jeff.science at gmail.com
Thu Feb 18 08:49:47 CST 2016

On Thu, Feb 18, 2016 at 5:58 AM, Bill Long <longb at cray.com> wrote:

> It would seem peculiar to have no Fortran compiler installed.  Even if
> that was the case at the moment, it could change in the future, and you
> would not want to have to rebuild MPI in that case.

It is not peculiar.  LLVM does not yet have a usable Fortran front-end, so
anyone that uses this compiler toolchain exclusively does not have a
Fortran compiler.

When I build MPICH with LLVM, I do a pure build, wherein CC=clang,
CXX=clang++ FC=false.  This means that my MPI library cannot know anything
about Fortran and I do not want it to make stuff up.

LLVM is the system compiler for a relatively large computer company known
as Apple, and many HPC users own such systems :-)


Jeff Hammond
jeff.science at gmail.com
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