[Buildroot] [PATCH 0/7] package/go: handle CGO linking for the host

[<yann.morin@orange.com>]

From: "Yann E. MORIN" <yann.morin@orange.com>

Hello All!

This series adds the necessary pieces to expose whether the go compiler
has CGO linking support for the host.

The overall issue with the go compiler, is that we have a single one
that can build for the target *and* for the host. Any limitation due to
the target thus leak to the host. This is notably the case for CGO
linking.

This series fixes that by adding a Kconfig symbol that represents
whether CGO linking for the host is available. Then, it goes on to fix a
few existing packages to add the new dependency.

Host variants of target packages that need CGO linking were found with:

    $ git grep -l BR2_PACKAGE_HOST_GO_TARGET_CGO_LINKING_SUPPORTS \
    |while read f; do
        [ -e "${f}.host" ] && echo "${f}"
    done

Which returns a rather short list:

    package/delve/Config.in
    package/moby-buildkit/Config.in
    package/runc/Config.in

And thus they are all three fixed.

There are only two host-only packages:

    $ git grep -l host-golang-package package/*/'**'.mk \
    |while read f; do
        grep -q -E '\(golang' "${f}" || echo "${f}"
    done
    package/mender-artifact/mender-artifact.mk
    package/skopeo/skopeo.mk

Skopeo is fixed in this series, as this is what prompted this work; so
it leaves mender-artifact to check. I have no idea how to check whether
a package needs CGO linking, though, so this is left as an exercise for
any interested party... This is however rather theoretical, as the only
hosts that do not support CGO linking (based on the target conditions)
would be mips64 or mips64el hosts, and it is very doubtful Buildroot
ever ran, runs, or will ever run on such hosts [0]; static-only or
thread-less hosts are also not widely deployed either...

[0] git grep -E 'HOSTARCH.*mips64' returns nothing before this series,
    so we have no special condition for running on mips64, which is a
    bit surprising...


Regards,
Yann E. MORIN.


The following changes since commit e321e81cf921346ec2d4cd1a9439016c7b2d3fb5

  configs/beaglebone: bump Linux to 6.6.32-ti-rt-arm32-r7 and U-Boot to 2024.07 (2024-07-30 23:44:30 +0200)


are available as patches in this mail series,

for you to apply patches up to 5cb88f8337a63230f90e02423005ba169e307549

  package/skopeo: bump version (2024-08-01 10:36:24 +0200)


----------------------------------------------------------------
Yann E. MORIN (7):
      package/skopeo: add missing dependency on host go arch support
      package/go: expose host CGO linking support
      package/delve: needs CGO linking for host
      package/moby-buildkit: needs CGO linking for host
      package/runc: needs CGO linking for host
      package/skopeo: needs CGO linking for host
      package/skopeo: bump version

 docs/manual/adding-packages-golang.adoc |  3 ++-
 package/delve/Config.in.host            |  1 +
 package/go/Config.in.host               | 12 ++++++++++++
 package/go/go.mk                        |  7 ++++---
 package/moby-buildkit/Config.in.host    |  1 +
 package/runc/Config.in.host             |  1 +
 package/skopeo/Config.in.host           |  2 ++
 package/skopeo/skopeo.hash              |  2 +-
 package/skopeo/skopeo.mk                |  2 +-
 9 files changed, 25 insertions(+), 6 deletions(-)

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|                 | Software  Designer |  _/ - /'   | \ / CAMPAIGN     |
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