[Buildroot] [Bug 16009] New: 'select' does not work with 'choice'

[Buildroot] [Bug 16009] New: 'select' does not work with 'choice'

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=16009

            Bug ID: 16009
           Summary: 'select' does not work with 'choice'
           Product: buildroot
           Version: 2024.02.1
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned@buildroot.uclibc.org
          Reporter: achpile@gmail.com
                CC: buildroot@uclibc.org
  Target Milestone: ---

If we have something like this in Config.in

choice
        prompt "TEST"
        config BR2_TEST_1
                bool "1"
        config BR2_TEST_2
                bool "2"
endchoice

config BR2_TEST_BOOL_D1
        bool "Depends on 1"
        depends on BR2_TEST_1

config BR2_TEST_BOOL_S1
        bool "Selects 1"
        select BR2_TEST_1

config BR2_TEST_BOOL_D2
        bool "Depends on 2"
        depends on BR2_TEST_2

config BR2_TEST_BOOL_S2
        bool "Selects 2"
        select BR2_TEST_2


Then selecting BR2_TEST_BOOL_S1 or BR2_TEST_BOOL_S2 does not select BR2_TEST_1
or BR2_TEST_2. I am not sure if it is expected behavior but seems like a bug to
me.

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[Buildroot] [Bug 16009] 'select' does not work with 'choice'

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=16009

Arnout Vandecappelle <arnout@mind.be> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WONTFIX
             Status|NEW                         |RESOLVED

--- Comment #1 from Arnout Vandecappelle <arnout@mind.be> ---
This is just how Kconfig works: it is not possible to "select" an option in a
choice. We don't develelop Kconfig ourselves, we simply inherit it from the
Linux kernel, so we are not in a position to fix this issue.

I think the reason it is this way is that there is nothing stopping two configs
to select two separate options from the choice. In your example, if both
BR2_TEST_BOOL_S1 and BR2_TEST_BOOL_S2 are set to y, then both BR2_TEST_1 and
BR2_TEST_2 would be selected. I think to fix this issue, you would need to put
a full-fledged boolean resolver behind it.

If you want a workaround for this limitation, take a look at openssl. It has a
choice between libopenssl and libressl, but there is also the symbol
BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL. If that symbol is selected, the libressl
choice is no longer available, so it is forced to openssl. Note that it is only
possible to force it in one direction that way (so there is no
BR2_PACKAGE_OPENSSL_FORCE_LIBRESSL) - otherwise, you'd be back in the same
situation as your example; Kconfig reports this as a circular dependency.

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[Buildroot] [Bug 16009] 'select' does not work with 'choice'

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=16009

--- Comment #2 from achpile@gmail.com ---
(In reply to Arnout Vandecappelle from comment #1)

Oh, sorry. I didn't know that it is Kconfig and that it is separate from
buildroot.

Big thanks for such a great explanation!

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