Re: [PATCH 2/2] sbuild: do not build arch all packages on cross

["'MOESSBAUER, Felix' via isar-users" <isar-users@googlegroups.com>]

On Wed, 2026-04-29 at 12:55 +0200, Jan Kiszka wrote:
> On 29.04.26 12:53, Jan Kiszka wrote:
> > On 29.04.26 12:47, 'Felix Moessbauer' via isar-users wrote:
> > > Architecture all packages often cannot be built in cross mode, as the
> > > dependencies cannot be resolved in the host architecture. This
> > > especially applies to all packages which split their build dependencies
> > > into Build-Depends-Arch and Build-Depends-Indep. We already have logic
> > > in isar to built DPKG_ARCH=all packages non-cross, but this does not
> > > work for packages that generate both arch specific and arch all binary
> > > packages.
> > > 
> > > While sbuild automatically disables builds of arch-all packages on
> > > cross, we previously explicitly overrode this setting. We now change
> > > this by explicitly setting --no-arch-all flag on cross and --arch-all on
> > > non-cross.
> > > 
> > > Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
> > > ---
> > >  RECIPE-API-CHANGELOG.md          | 15 +++++++++++++++
> > >  meta/classes-recipe/dpkg.bbclass |  3 ++-
> > >  2 files changed, 17 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md
> > > index 856da5de..c83c1599 100644
> > > --- a/RECIPE-API-CHANGELOG.md
> > > +++ b/RECIPE-API-CHANGELOG.md
> > > @@ -1001,3 +1001,18 @@ do_copy_boot_files: The recipe isar-image-base is trying to install
> > >  files into a shared area when those files already exists. It happens
> > >  when some files have the same names (e.g., dtb files) for different
> > >  distros.
> > > +
> > > +### No building of arch=all packages when cross building
> > > +
> > > +Architecture all packages often cannot be built in cross mode, as the
> > > +dependencies cannot be resolved in the foreign architecture. This especially
> > > +applies to all packages which split their build dependencies into
> > > +`Build-Depends-Arch` and `Build-Depends-Indep`. We already have logic
> > > +in isar to built `DPKG_ARCH = "all"` packages non-cross, but this does not
> > > +work for packages that generate both arch specific and arch all binary packages.
> > > +
> > > +We now explicitly disable building arch=all binary packages on cross (this
> > > +technically only affects packages that generate arch specific and arch=all
> > > +binary packages). To build the arch=all binary packages of such source packages,
> > > +add an explicit dependency to `${BPN}-native`. Source packages that only
> > 
> > That will be fun to find, though likely a rare one. Can't we detect such
> > cases in Isar and add a bitbake dependency from $BPN to -native?

We could try to parse the ${S}/debian/control file and detect this, but
I guess that doesn't work, as we would have to add the dependency
before running bitbake tasks (a common case is that the debian part is
fetched, hence the task need to run and then it's too late).

> > 
> 
> In fact, -native is practically overshooting. We would need a recipe
> target that only build the all package.

I thought about this as well. We would need a -all variant that is
basically identical to -native but adds the --no-arch-any sbuild flag.
However, this only helps for first-stage dependencies, as the
transitive dependencies still need to be build in -native. Further, we
need to ensure that either -all or -native is built, but not both. This
would need a model similar to the fetch_common_source task. That's a
lot of complexity for a minimal build-time improvement. By that, I
rather would like to avoid this optimization. If we really need it, we
still can add it in the future.

Felix

> 
> Jan
> 
> -- 
> Siemens AG, Foundational Technologies
> Linux Expert Center

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