[Buildroot] [Bug 14656] New: Adding dependencies from an external tree does not work

[Buildroot] [Bug 14656] New: Adding dependencies from an external tree does not work

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14656

            Bug ID: 14656
           Summary: Adding dependencies from an external tree does not
                    work
           Product: buildroot
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned@buildroot.uclibc.org
          Reporter: dopsi@dopsi.ch
                CC: buildroot@uclibc.org
  Target Milestone: ---

When a dependency is added by a Makefile in an external tree to a package
present in the Buildroot tree, the dependency does not get built before the
package.

Detailled description:

When having the following in an external tree:

    FOO_DEPENDENCIES += bar

FOO_FINAL_ALL_DEPENDENCIES gets updated and will contain bar (as shown by
running make foo-show-depends) but this will not be reflected in the build
order (as shown in make foo-show-build-order).

In the package/pkg-generic.mk file [1] there is a call to patsubst that will
compute the prerequisites for foo-show-build-order.

When printing the output of pathsubst with

    echo $$(patsubst %,%-show-build-order,$$($(2)_FINAL_ALL_DEPENDENCIES))

the value is properly written out and will contain bar. However, the
prerequisite is not present when printing them out with

    echo $$^

[1] https://git.buildroot.org/buildroot/tree/package/pkg-generic.mk#n996

Links:
- first mailing list post:
https://lists.buildroot.org/pipermail/buildroot/2022-February/637237.html
- second mailing list post:
https://lists.buildroot.org/pipermail/buildroot/2022-March/638117.html
- minimal example: https://gitlab.com/dopsi/mve-br2-external-dep

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[Buildroot] [Bug 14656] Adding dependencies from an external tree does not work

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14656

--- Comment #1 from Simon Doppler <dopsi@dopsi.ch> ---
Workaround: It is possible to build bar first and then building the entire
system.

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[Buildroot] [Bug 14656] Adding dependencies from an external tree does not work

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14656

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |yann.morin.1998@free.fr
         Resolution|---                         |WONTFIX

--- Comment #2 from Yann E. MORIN <yann.morin.1998@free.fr> ---
Simon, All,

As I explained on the list [0], it is not possible to use a br2-external
tree to modify the dependencies of a package.


[0]
https://lore.kernel.org/buildroot/20220309201030.GA23050@scaer/T/#m4bacf3a6047b2da82554d088f2afd805bef5a312

There is for now no way to achieve what you need without directly modifying
the original package's .mk file.

(note: there have been a few ideas floated around in the past, but they are
far from trivial to apply, if at all.)

Regards,
Yann E. MORIN.

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