Re: [Buildroot] [PATCH 3/5] package/openmpi: enable mpi compiler wrapper scripts

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Julien,

On Tue,  7 Feb 2023 23:09:39 +0100
Julien Olivain <ju.o@free.fr> wrote:

> openmpi normally includes compiler wrapper binary programs (e.g. mpicc,
> mpicxx, etc...). Those programs are inconvenient when cross compiling.
> Those target binary wrappers are useless in Buildroot, as the target
> root filesystem does not include compilers. For cross compilation,
> openmpi also ships Perl scripts providing a subset of those functions.
> With those compiler wrappers, openmpi programs can now be cross
> compiled properly in Buildroot. This patch enables those wrappers.
> 
> Signed-off-by: Julien Olivain <ju.o@free.fr>
> ---
>  package/openmpi/openmpi.mk | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/package/openmpi/openmpi.mk b/package/openmpi/openmpi.mk
> index f14b55ced5..e6f5cd0250 100644
> --- a/package/openmpi/openmpi.mk
> +++ b/package/openmpi/openmpi.mk
> @@ -17,7 +17,9 @@ OPENMPI_INSTALL_STAGING = YES
>  # found. This makes the configuration fail. See:
>  # https://github.com/open-mpi/ompi/blob/v4.1.4/config/ompi_check_ime.m4#L35
>  # Disable explicitly to avoid the issue.
> -OPENMPI_CONF_OPTS = --without-ime
> +OPENMPI_CONF_OPTS = \
> +	--enable-script-wrapper-compilers \

So if I look at your PATCH 4/5, this means that "mpicc" is one of those
wrapper script, installed in $(STAGING_DIR), but meant to be executed
on the host?

As you're saying it's written in Perl, did you test it with a minimal
Fedora installation, to see if it has requirements beyond the base Perl
installation? (compared to Debian/Ubuntu, Fedora has a much more
fine-grained packaging of basic Perl modules, this recently lead to a
small amount of additional checks in dependencies.sh, see
https://gitlab.com/buildroot.org/buildroot/-/commits/master/support/dependencies/dependencies.sh).

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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