Re: [PATCH 3/3] osstest: add FreeBSD Xen build job

["Roger Pau Monné" <roger.pau@citrix.com>]

On Tue, Jul 03, 2018 at 04:22:45PM +0100, Ian Jackson wrote:
> Roger Pau Monne writes ("[PATCH 3/3] osstest: add FreeBSD Xen build job"):
> > To both the FreeBSD and the xen-unstable flights.
> > 
> > This is the runvar difference of a xen-unstable flight:
> 
> Just to clarify my thinking:
> 
> > +    # Create a Xen build job that's going to use the output from the first
> > +    # FreeBSD build job.
> 
> I think you do it like this so that on the freebsd branch, we use the
> new being-tested version of freebsd, and see if it breaks the Xen
> build.

Yes, that's the intention.

> > +    case "$xenbranch" in
> > +    xen-unstable) build_on_freebsd=true;;
> > +    *)            build_on_freebsd=false;;
> 
> I don't think this is right.  Why do we only want to do this with
> xen-unstable ?  If the problem is that you need "new enough" xen, then
> you need the version comparison case pattern used elsewhere, so that
> each new branch of Xen has this turned on.

Yes, you are right.

> > +      if [ x$arch = xamd64 ] && [ x$build_on_freebsd = xtrue ] ; then
> > +        job_create_build build-$arch$xsm_suffix-freebsd build-xen-freebsd    \
> > +          arch=$arch                                                         \
> > +          enable_xsm=$enable_xsm $livepatch_runvars                          \
> > +          tree_qemuu=$TREE_QEMU_UPSTREAM                                     \
> > +          tree_xen=$TREE_XEN                                                 \
> > +          tree_seabios=$TREE_SEABIOS                                         \
> > +          $RUNVARS $BUILD_RUNVARS $BUILD_XEN_RUNVARS $arch_runvars           \
> > +          host_hostflags=arch-$arch,purpose-build                            \
> > +          revision_xen=$REVISION_XEN                                         \
> > +          revision_qemu=$REVISION_QEMU                                       \
> > +          revision_qemuu=$REVISION_QEMU_UPSTREAM                             \
> > +          revision_seabios=$REVISION_SEABIOS                                 \
> 
> These various xen build runvar settings seem to have mostly been
> copied from create_build_jobs.  I think they should be abstracted into
> a function.
> 
> Also of course you have two places where you create the job
> build-xen-freebsd.  Can we please have a shell function for that to
> avoid the duplication ?

Yes, let me try.

> > +proc run-job/build-xen-freebsd {} {
> > +    run-ts . xen-build-clang ts-xen-build + host -- clang=y SEABIOSCC=gcc \
> > +                                                    SEABIOSLD=/usr/local/bin/ld
> 
> This is quite ugly.  sg-run-job normally tries to be a bit more
> abstract.  I'm not sure exactly what to suggest.
> 
> Maybe a ts-xen-build-clang containing these arguments ?  Of course for
> a clang build on Linux /usr/local/bin/ld is wrong...

Maybe ts-xen-build-freebsd?

I went this route because it did not involve creating yet another
ts-build-* script, but if you think it's better I can add such a
script.

> It's also very odd that /usr/local/bin/ld is the right thing here.
> I'm not sure how the semantics of /usr/local ("locally installed")
> relate to Seabios's need for (presumably) binutils ld ?

Yes, SeaBIOS requires GNU ld in order to build, hence the setting of
those parameters.

On FreeBSD there's a difference from what's in base and on ports. base
is the basic system that contains a basic set of utilities, and it's
using a single repository:

https://svnweb.freebsd.org/base/head/

This contains the kernel, loader, and what's considered a minimal set
of tools to get a working UNIX system.

Everything else is installed from packages, and all those go by
default into /usr/local (you can change that to whatever path you
want). The set of packages to install is called ports, and the source
is not hosted in a FreeBSD repository, only the recipes to build them:

https://svnweb.freebsd.org/ports/head/

GNU binutils is moving outside of base, and is installed from a port
into /usr/local.

> Is it
> conventional on FreeBSD that /usr/local/bin/ld is binutils, or is that
> some kind of happenstance ?

It happens to be like that in this case because the
ts-build-prep-freebsd installs the binutils package in /usr/local and
that provides GNU ld in the specified path.

Thanks, Roger.

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