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bitbake: bitbake-user-manual: Updated the PROVIDES variable 

Fixes [YOCTO #10011]

Added paragraphs near the end to describe the role of virtual
targets.

(Bitbake rev: fc47bb99dbc1972dfb3a83c0f4c479963da64bcc)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark 2016-07-29 14:08:25 -07:00 committed by Richard Purdie
parent f0e73a4b65
commit e205789361
1 changed files with 21 additions and 0 deletions
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21
bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.xml
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@ -1976,6 +1976,27 @@
The <filename>PROVIDES</filename> statement results in
the "libav" recipe also being known as "libpostproc".
</para>
<para>
In addition to providing recipes under alternate names,
the <filename>PROVIDES</filename> mechanism is also used
to implement virtual targets.
A virtual target is a name that corresponds to some
particular functionality (e.g. a Linux kernel).
Recipes that provide the functionality in question list the
virtual target in <filename>PROVIDES</filename>.
Recipes that depend on the functionality in question can
include the virtual target in
<link linkend='var-DEPENDS'><filename>DEPENDS</filename></link>
to leave the choice of provider open.
</para>
<para>
Conventionally, virtual targets have names on the form
"virtual/function" (e.g. "virtual/kernel").
The slash is simply part of the name and has no
syntactical significance.
</para>
</glossdef>
</glossentry>