ref-manual: Updated the intro text to "Distro Features" section.
(From yocto-docs rev: 328f7115e3f557ca979fa330e068739c4b0e2bcd) Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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<para>
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The items below are features you can use with
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<link linkend='var-DISTRO_FEATURES'><filename>DISTRO_FEATURES</filename></link>.
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Features do not have a one-to-one correspondence to packages, and they can
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go beyond simply controlling the installation of a package or packages.
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Sometimes a feature can influence how certain recipes are built.
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For example, a feature might determine whether a particular configure option
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is specified within <filename>do_configure</filename> for a particular
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recipe.
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<link linkend='var-DISTRO_FEATURES'><filename>DISTRO_FEATURES</filename></link>
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to enable features across your distribution.
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Features do not have a one-to-one correspondence to packages,
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and they can go beyond simply controlling the installation of a
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package or packages.
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In most cases, the presence or absence of a feature translates to
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the appropriate option supplied to the configure script during
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<filename>do_configure</filename> for the recipes that optionally
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support the feature.
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</para>
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<para>
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Some distro features are also machine features.
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This select list of features makes sense to be controlled both at
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the machine and distribution configuration level.
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See the
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<ulink url='&YOCTO_DOCS_REF_URL;#var-COMBINED_FEATURES'><filename>COMBINED_FEATURES</filename></ulink>
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variable for more information.
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</para>
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<para>
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