In the email from Thursday, 4 August 2022 10:56:40 +03 user Moessbauer, Felix wrote:
> > -----Original Message-----
> > From: Anton Mikanovich <amikan@ilbers.de>
> > Sent: Thursday, August 4, 2022 9:36 AM
> > To: Moessbauer, Felix (T CED SES-DE) <felix.moessbauer@siemens.com>;
> > isar-users@googlegroups.com
> > Cc: Kiszka, Jan (T CED) <jan.kiszka@siemens.com>; Uladzimir Bely
> > <ubely@ilbers.de>
> > Subject: Re: [PATCH] install crossbuild-essential into base schroot
> > 
> > 03.08.2022 19:44, Felix Moessbauer wrote:
> > 
> > > This patch always installs the crossbuild-essential-<distro> package
> > > into the lower dir of the host sbuild schroot.
> > >
> > >
> > >
> > > This avoids having to install this package in the upper-dir when
> > > cross-compiling, and is identical to build-essential when natively
> > > compiling.
> > > By that, the parallel cross-build of packages is significantly faster.
> > >
> > >
> > >
> > > Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
> > > ---
> > > 
> > >   meta/recipes-devtools/sbuild-chroot/sbuild-chroot-host.bb | 5 +++++
> > >   1 file changed, 5 insertions(+)
> > >
> > >
> > >
> > > diff --git a/meta/recipes-devtools/sbuild-chroot/sbuild-chroot-host.bb
> > > b/meta/recipes-devtools/sbuild-chroot/sbuild-chroot-host.bb
> > > index aa82846b..f7c7d11b 100644
> > > --- a/meta/recipes-devtools/sbuild-chroot/sbuild-chroot-host.bb
> > > +++ b/meta/recipes-devtools/sbuild-chroot/sbuild-chroot-host.bb
> > > @@ -9,5 +9,10 @@ SBUILD_VARIANT = "host"
> > >
> > >
> > >
> > >   require sbuild-chroot.inc
> > >
> > >
> > >
> > > +# always add the crossbuild-essentials package which is # a noop for
> > > +the host distro, but significantly reduces # the download + install
> > > +time when cross-compiling SBUILD_CHROOT_PREINSTALL_COMMON +=
> > > +"crossbuild-essential-${DISTRO_ARCH}"
> > > +
> > > 
> > >   ROOTFS_ARCH = "${HOST_ARCH}"
> > >   ROOTFS_DISTRO = "${HOST_DISTRO}"
> > 
> > 
> > This will probably not work on riscv64 and any other targets with
> > self-build
 crossbuild-essential.
> 
> 
> The CI did not report any issues with this patch, but maybe an riscv64 test
> is missing...
 Either we exclude these community-ports of Debian, or we
> simply just apply the patches for the architectures we support and we know
> it works (like armhf, arm64). 
> Even if this is just a performance thing, in layers with dozens of packages
> the overhead of just installing the compilers is huge.
 It also bloats the
> upper-dir of the schroot leading to significant disk consumption. 
> Jan recently reported that the build time raised a lot when switching an
> arm64 layer to from ISAR v0.9 to ISAR-next (sbuild).
 Very likely most of
> that came from the crossbuild-essential packages. 
> Felix

We could also simply control it from local.conf at downstream level:

SBUILD_CHROOT_PREINSTALL += "${@ 'crossbuild-essential-${DISTRO_ARCH}' if 
d.getVar('SBUILD_VARIANT') == 'host' else ''}"

This still just needs a small change in SBUILD_CHROOT_PREINSTALL definition in sbuild-
chroot.inc (replace '?=' with '+=')

builder@9f6a3f775537:/build/bc$ bitbake -e mc:qemuarm-bullseye:sbuild-chroot-target | grep 
"SBUILD_CHROOT_PREINSTALL=" 
SBUILD_CHROOT_PREINSTALL="fakeroot build-essential debhelper 
ccache devscripts equivs" 
builder@9f6a3f775537:/build/bc$ bitbake -e mc:qemuarm-bullseye:sbuild-chroot-host | grep 
"SBUILD_CHROOT_PREINSTALL="       
SBUILD_CHROOT_PREINSTALL="crossbuild-essential-armhf fakeroot build-
essential debhelper ccache devscripts equivs  "
This approach looks more flexible for me.

-- 
Uladzimir Bely