RE: -native working as designed? target vs host sbuild-chroot

["Schmidt, Adriaan" <adriaan.schmidt@siemens.com>]

cedric.hombourger@siemens.com, Friday, October 6, 2023 4:50 AM:
> Hello,
> 
> I was wondering if handling of -native was working as designed (or if I
> am missing something).
> 
> Let's consider the following steps:
> 
>      git clone -b next https://github.com/ilbers/isar
>      . isar-init-build-env
>      mc:qemuarm64-bookworm:hello-native
> 
> Observe that the build constructs sbuild-chroot-target when I would have
> expected sbuild-chroot-host. The sbuild environment for hello is indeed
> configured to build an amd64 package while running on an arm64 userland
> => the build of that package alone takes several minutes (on an Intel
> Xeon 6242 and with /proc/cpuinfo listing 64 processors)
> 
> In addition, when using Isar from master (where support for -native and
> -compat is already there), the build fails to install build dependencies
> for hello-native:
> 
> |  sbuild-build-depends-main-dummy:amd64 : Depends: libc-dev:amd64 but
> it is not installable
> |                                          Depends: libstdc++-dev:amd64
> but it is not installable
> 
> This issue may also be reproduced on next with
> 7bc68bb27f562257977bb5f701564ab08d4c5b3a (base: Fix HOST_ARCH for native
> builds) removed. I guess I just making a note that -native may have
> issues on master.
> 
> My outstanding question would be: shouldn't -native use the *host*
> sbuild-chroot? If we agree that it should then I am happy to look into this.

Hi Cedric,

Yes, you are right. The problem seems to be that when building -native,
native.bbclass adapts PACKAGE_ARCH, but the selection of the sbuild-chroot
(via SCHROOT_DEP in crossvars.bbclass) selects based on DISTRO_ARCH.

Can you try what happens with:

diff --git a/meta/classes/crossvars.bbclass b/meta/classes/crossvars.bbclass
index df26f47f..508ba72d 100644
--- a/meta/classes/crossvars.bbclass
+++ b/meta/classes/crossvars.bbclass
@@ -15,7 +15,7 @@ python __anonymous() {
     flavor = d.getVar('SBUILD_FLAVOR')
     flavor_suffix = ('-' + flavor) if flavor else ''
 
-    distro_arch = d.getVar('DISTRO_ARCH')
+    distro_arch = d.getVar('PACKAGE_ARCH')
     if mode == "0" or d.getVar('HOST_ARCH') == distro_arch or distro_arch == None:
         d.setVar('BUILD_HOST_ARCH', distro_arch)
         schroot_dir = d.getVar('SCHROOT_TARGET_DIR', False)

Thanks,
Adriaan

> Thanks
> Cedric
> 
> Refs:
>      next @ b602e36defa0abacb9ba874b4e98bc9741a006a0 kas: Fix a typo in
> KAS_IMAGE_PREINSTALL list
>      master @ 61086915e6c83fff22effa85cda64a2ac0c2f100 dpkg: Fix
> internal deb import for sbuild
> 
> 
> 
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