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<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >

<chapter id='ref-varlocality'>
    <title>Variable Context</title>

    <para>
        While you can use most variables in almost any context such as
        <filename>.conf</filename>, <filename>.bbclass</filename>,
        <filename>.inc</filename>, and <filename>.bb</filename> files,
        some variables are often associated with a particular locality or context.
        This chapter describes some common associations.
    </para>

    <section id='ref-varlocality-configuration'>
        <title>Configuration</title>

        <para>
            The following subsections provide lists of variables whose context is
            configuration: distribution, machine, and local.
        </para>

        <section id='ref-varlocality-config-distro'>
            <title>Distribution (Distro)</title>

            <para>
               This section lists variables whose configuration context is the
               distribution, or distro.
               <itemizedlist>
                   <listitem><para><filename><link linkend='var-DISTRO'>DISTRO</link></filename></para></listitem>
                   <listitem><para><filename><link linkend='var-DISTRO_NAME'>DISTRO_NAME</link></filename>
                       </para></listitem>
                   <listitem><para><filename><link linkend='var-DISTRO_VERSION'>DISTRO_VERSION</link>
                       </filename></para></listitem>
                   <listitem><para><filename><link linkend='var-MAINTAINER'>MAINTAINER</link></filename>
                       </para></listitem>
                   <listitem><para><filename><link linkend='var-PACKAGE_CLASSES'>PACKAGE_CLASSES</link>
                       </filename></para></listitem>
                   <listitem><para><filename><link linkend='var-TARGET_OS'>TARGET_OS</link></filename>
                       </para></listitem>
                   <listitem><para><filename><link linkend='var-TARGET_FPU'>TARGET_FPU</link></filename>
                       </para></listitem>
                   <listitem><para><filename><link linkend='var-TCMODE'>TCMODE</link></filename>
                       </para></listitem>
                   <listitem><para><filename><link linkend='var-TCLIBC'>TCLIBC</link></filename>
                       </para></listitem>
                </itemizedlist>
            </para>
        </section>

        <section id='ref-varlocality-config-machine'>
            <title>Machine</title>

            <para>
                This section lists variables whose configuration context is the
                machine.
                <itemizedlist>
                    <listitem><para><filename><link linkend='var-TARGET_ARCH'>TARGET_ARCH</link></filename>
                        </para></listitem>
                    <listitem><para><filename><link linkend='var-SERIAL_CONSOLES'>SERIAL_CONSOLES</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-PACKAGE_EXTRA_ARCHS'>PACKAGE_EXTRA_ARCHS</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-IMAGE_FSTYPES'>IMAGE_FSTYPES</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-MACHINE_FEATURES'>MACHINE_FEATURES</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-MACHINE_EXTRA_RDEPENDS'>MACHINE_EXTRA_RDEPENDS
                        </link></filename></para></listitem>
                    <listitem><para><filename><link linkend='var-MACHINE_EXTRA_RRECOMMENDS'>MACHINE_EXTRA_RRECOMMENDS
                        </link></filename></para></listitem>
                    <listitem><para><filename><link linkend='var-MACHINE_ESSENTIAL_EXTRA_RDEPENDS'>MACHINE_ESSENTIAL_EXTRA_RDEPENDS
                        </link></filename></para></listitem>
                    <listitem><para><filename><link linkend='var-MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS'>
                        MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS</link></filename></para></listitem>
                </itemizedlist>
            </para>
        </section>

        <section id='ref-varlocality-config-local'>
            <title>Local</title>

            <para>
                This section lists variables whose configuration context is the
                local configuration through the <filename>local.conf</filename>
                file.
                <itemizedlist>
                    <listitem><para><filename><link linkend='var-DISTRO'>DISTRO</link></filename>
                        </para></listitem>
                    <listitem><para><filename><link linkend='var-MACHINE'>MACHINE</link></filename>
                        </para></listitem>
                    <listitem><para><filename><link linkend='var-DL_DIR'>DL_DIR</link></filename>
                        </para></listitem>
                    <listitem><para><filename><link linkend='var-BBFILES'>BBFILES</link></filename>
                        </para></listitem>
                    <listitem><para><filename><link linkend='var-EXTRA_IMAGE_FEATURES'>EXTRA_IMAGE_FEATURES
                        </link></filename></para></listitem>
                    <listitem><para><filename><link linkend='var-PACKAGE_CLASSES'>PACKAGE_CLASSES</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-BB_NUMBER_THREADS'>BB_NUMBER_THREADS</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-BBINCLUDELOGS'>BBINCLUDELOGS</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-ENABLE_BINARY_LOCALE_GENERATION'>
                        ENABLE_BINARY_LOCALE_GENERATION</link></filename></para></listitem>
                </itemizedlist>
            </para>
        </section>
    </section>

    <section id='ref-varlocality-recipes'>
        <title>Recipes</title>

        <para>
            The following subsections provide lists of variables whose context is
            recipes: required, dependencies, path, and extra build information.
        </para>

        <section id='ref-varlocality-recipe-required'>
            <title>Required</title>

            <para>
                This section lists variables that are required for recipes.
                <itemizedlist>
                    <listitem><para><filename><link linkend='var-LICENSE'>LICENSE</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-LIC_FILES_CHKSUM'>LIC_FILES_CHKSUM</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-SRC_URI'>SRC_URI</link></filename> - used
                        in recipes that fetch local or remote files.
                        </para></listitem>
                </itemizedlist>
            </para>
        </section>

        <section id='ref-varlocality-recipe-dependencies'>
            <title>Dependencies</title>

            <para>
                This section lists variables that define recipe dependencies.
                <itemizedlist>
                    <listitem><para><filename><link linkend='var-DEPENDS'>DEPENDS</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-RDEPENDS'>RDEPENDS</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-RRECOMMENDS'>RRECOMMENDS</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-RCONFLICTS'>RCONFLICTS</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-RREPLACES'>RREPLACES</link>
                        </filename></para></listitem>
                </itemizedlist>
            </para>
        </section>

        <section id='ref-varlocality-recipe-paths'>
            <title>Paths</title>

            <para>
                This section lists variables that define recipe paths.
                <itemizedlist>
                    <listitem><para><filename><link linkend='var-WORKDIR'>WORKDIR</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-S'>S</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-FILES'>FILES</link>
                        </filename></para></listitem>
                </itemizedlist>
            </para>
        </section>

        <section id='ref-varlocality-recipe-build'>
            <title>Extra Build Information</title>

            <para>
                This section lists variables that define extra build information for recipes.
                <itemizedlist>
                    <listitem><para><filename><link linkend='var-EXTRA_OECMAKE'>EXTRA_OECMAKE</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-EXTRA_OECONF'>EXTRA_OECONF</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-EXTRA_OEMAKE'>EXTRA_OEMAKE</link>
                        </filename></para></listitem>
                    <listitem><para><filename><link linkend='var-PACKAGES'>PACKAGES</link></filename>
                        </para></listitem>
                    <listitem><para><filename><link linkend='var-DEFAULT_PREFERENCE'>DEFAULT_PREFERENCE
                        </link></filename></para></listitem>
                </itemizedlist>
            </para>
        </section>
    </section>
</chapter>
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