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docs/manual: dependency documentation updates

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Update dependency documentation to detail the order-only relationship
associated with the DEPENDENCIES variable.  See the thread at [1] for
details.

[1] http://lists.busybox.net/pipermail/buildroot/2019-October/262685.html

Signed-off-by: Dan Walkes <danwalkes@trellis-logic.com>
[yann.morin.1998@free.fr: indentation & slight rephrasing]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Dan Walkes 2019-10-16 11:55:45 -06:00 committed by Yann E. MORIN
parent d08c76e45d
commit 05d4ce4445
2 changed files with 15 additions and 3 deletions
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8
docs/manual/adding-packages-generic.txt
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@ -358,9 +358,11 @@ not and can not work as people would expect it should:
* +LIBFOO_DEPENDENCIES+ lists the dependencies (in terms of package * +LIBFOO_DEPENDENCIES+ lists the dependencies (in terms of package
name) that are required for the current target package to name) that are required for the current target package to
compile. These dependencies are guaranteed to be compiled and compile. These dependencies are guaranteed to be compiled and
installed before the configuration of the current package starts. In installed before the configuration of the current package starts.
a similar way, +HOST_LIBFOO_DEPENDENCIES+ lists the dependencies for However, modifications to configuration of these dependencies will
the current host package. not force a rebuild of the current package. In a similar way,
+HOST_LIBFOO_DEPENDENCIES+ lists the dependencies for the current
host package.
* +LIBFOO_EXTRACT_DEPENDENCIES+ lists the dependencies (in terms of * +LIBFOO_EXTRACT_DEPENDENCIES+ lists the dependencies (in terms of
package name) that are required for the current target package to be package name) that are required for the current target package to be

10
docs/manual/rebuilding-packages.txt
View File

@ -65,6 +65,16 @@ can help you understand how to work with Buildroot:
there is no need for a full rebuild: a simple +make+ invocation there is no need for a full rebuild: a simple +make+ invocation
will take the changes into account. will take the changes into account.
* When a pacjage listed in +FOO_DEPENDENCIES+ is rebuilt or removed,
the package +foo+ is not automatically rebuilt. For example, if a
package +bar+ is listed in +FOO_DEPENDENCIES+ with +FOO_DEPENDENCIES
= bar+ and the configuration of the +bar+ package is changed, the
configuration change would not result in a rebuild of package +foo+
automatically. In this scenario, you may need to either rebuild any
packages in your build which reference +bar+ in their +DEPENDENCIES+,
or perform a full rebuild to ensure any +bar+ dependent packages are
up to date.
Generally speaking, when you're facing a build error and you're unsure Generally speaking, when you're facing a build error and you're unsure
of the potential consequences of the configuration changes you've of the potential consequences of the configuration changes you've
made, do a full rebuild. If you get the same build error, then you are made, do a full rebuild. If you get the same build error, then you are