Re: "error: No best alternative for {dir}/libs/mpi/build/boost_mpi", but the build succeeds

From: Nicholas Williams (nicholas_at_[hidden])
Date: 2025-01-17 17:23:28

It also turns out that I've been told we do not need MPI, which is good
because we don't have MPI compilers installed on our builders, so "using
mpi ;" did nothing (understandably).

That was probably the problem all along FWIW.

Thanks,

Nick

On Fri, Jan 17, 2025 at 7:49 AM Дмитрий Архипов via Boost-users <
boost-users_at_[hidden]> wrote:

> чт, 16 янв. 2025 г. в 23:59, Nicholas Williams <
> nicholas_at_[hidden]>:
> > This is from just one platform (as stated in my original post, all
> platforms have the exact same error):
> >
> > https://gist.github.com/beamerblvd/5bbc952d8ece4a44e38df8630837114a
>
> It turns out, the problem is that you need to configure the mpi module. Put
>
> using mpi ;
>
> into either user-config.jam or project-config.jam (the former is
> better, because the bootstrap script rewrites project-config.jam).
>
> Boost.MPI was supposed to tell you that you need to do this, but
> something made this part to do nothing:
>
>         message boost_mpi
>             : "warning: skipping optional Message Passing Interface
> (MPI) library."
>             : "note: to enable MPI support, add \"using mpi ;\" to
> user-config.jam."
>             : "note: to suppress this message, pass \"--without-mpi\" to
> b2."
>             : "note: otherwise, you can safely ignore this message."
>             ;
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