ref-manual, overview-manual, Makefile: Moved toolchain concepts

Fixes [YOCTO #12370]

Moved the "Cross-Development Toolchain Generation" section from the
ref-manual to the overview-manual into the concepts chapter.  This
information is conceptual and now needs to live in the concepts
chapter of the new overview-manual.  Moving the section caused a
few links to have to be fixed in the ref-manual.  There was also a
figure in the section.  So, I had to move the figure from the ref-manual
to the overview-manual "figures" folder and update the Makefile for
the TARFILE generation.

(From yocto-docs rev: 1f3ee5ab308cbe6bd7194086026db397b67ca7c4)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

5 files changed, 14 insertions, 213 deletions

diff --git a/documentation/ref-manual/figures/cross-development-toolchains.png b/documentation/ref-manual/figures/cross-development-toolchains.png
deleted file mode 100644
index d36670a198..0000000000
--- a/documentation/ref-manual/figures/cross-development-toolchains.png
+++ /dev/null
diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index f27f33f292..b11fbea63e 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -568,8 +568,9 @@
         provides support for the recipes that build the Canadian
         Cross-compilation tools for SDKs.
         See the
-        "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
-        section for more discussion on these cross-compilation tools.
+        "<ulink url='&YOCTO_DOCS_OVERVIEW_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
+        section in the Yocto Project Overview Manual for more discussion on
+        these cross-compilation tools.
     </para>
 </section>
 
@@ -581,8 +582,9 @@
         provides support for the recipes that build the cross-compilation
         tools used for building SDKs.
         See the
-        "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
-        section for more discussion on these cross-compilation tools.
+        "<ulink url='&YOCTO_DOCS_OVERVIEW_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
+        section in the Yocto Project Overview Manual for more discussion on
+        these cross-compilation tools.
     </para>
 </section>
 
@@ -2720,8 +2722,8 @@ This check was removed for YP 2.3 release
     <para>
         For more information on the cross-development toolchain
         generation, see the
-        "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
-        section.
+        "<ulink url='&YOCTO_DOCS_OVERVIEW_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
+        section in the Yocto Project Overview Manual.
         For information on advantages gained when building a
         cross-development toolchain using the
         <link linkend='ref-tasks-populate_sdk'><filename>do_populate_sdk</filename></link>
diff --git a/documentation/ref-manual/ref-terms.xml b/documentation/ref-manual/ref-terms.xml
index f5ff7df5fb..237e765202 100644
--- a/documentation/ref-manual/ref-terms.xml
+++ b/documentation/ref-manual/ref-terms.xml
@@ -181,8 +181,8 @@
                 <para>Creation of these toolchains is simple and automated.
                 For information on toolchain concepts as they apply to the
                 Yocto Project, see the
-                "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
-                section.
+                "<ulink url='&YOCTO_DOCS_OVERVIEW_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
+                section in the Yocto Project Overview Manual.
                 You can also find more information on using the
                 relocatable toolchain in the
                 <ulink url='&YOCTO_DOCS_SDK_URL;'>Yocto Project Application Development and the Extensible Software Development Kit (eSDK)</ulink>
diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 1b5f863970..48849b1fef 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -15183,8 +15183,8 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                 <para>
                     For background information on cross-development toolchains
                     in the Yocto Project development environment, see the
-                    "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
-                    section.
+                    "<ulink url='&YOCTO_DOCS_OVERVIEW_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
+                    section in the Yocto Project Overview Manual.
                     For information on setting up a cross-development
                     environment, see the
                     <ulink url='&YOCTO_DOCS_SDK_URL;'>Yocto Project Application Development and the Extensible Software Development Kit (eSDK)</ulink>
@@ -15242,8 +15242,8 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                 <para>
                     For background information on cross-development toolchains
                     in the Yocto Project development environment, see the
-                    "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
-                    section.
+                    "<ulink url='&YOCTO_DOCS_OVERVIEW_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
+                    section in the Yocto Project Overview Manual.
                     For information on setting up a cross-development
                     environment, see the
                     <ulink url='&YOCTO_DOCS_SDK_URL;'>Yocto Project Application Development and the Extensible Software Development Kit (eSDK)</ulink>
diff --git a/documentation/ref-manual/technical-details.xml b/documentation/ref-manual/technical-details.xml
index d0929bd756..3d3def5a65 100644
--- a/documentation/ref-manual/technical-details.xml
+++ b/documentation/ref-manual/technical-details.xml
@@ -13,207 +13,6 @@
         x32, Wayland support, and Licenses.
     </para>
 
-<section id="cross-development-toolchain-generation">
-    <title>Cross-Development Toolchain Generation</title>
-
-    <para>
-        The Yocto Project does most of the work for you when it comes to
-        creating
-        <link linkend='cross-development-toolchain'>cross-development toolchains</link>.
-        This section provides some technical background on how
-        cross-development toolchains are created and used.
-        For more information on toolchains, you can also see the
-        <ulink url='&YOCTO_DOCS_SDK_URL;'>Yocto Project Application Development and the Extensible Software Development Kit (eSDK)</ulink>
-        manual.
-    </para>
-
-    <para>
-        In the Yocto Project development environment, cross-development
-        toolchains are used to build the image and applications that run on the
-        target hardware.
-        With just a few commands, the OpenEmbedded build system creates
-        these necessary toolchains for you.
-    </para>
-
-    <para>
-        The following figure shows a high-level build environment regarding
-        toolchain construction and use.
-    </para>
-
-    <para>
-        <imagedata fileref="figures/cross-development-toolchains.png" width="8in" depth="6in" align="center" />
-    </para>
-
-    <para>
-        Most of the work occurs on the Build Host.
-        This is the machine used to build images and generally work within the
-        the Yocto Project environment.
-        When you run BitBake to create an image, the OpenEmbedded build system
-        uses the host <filename>gcc</filename> compiler to bootstrap a
-        cross-compiler named <filename>gcc-cross</filename>.
-        The <filename>gcc-cross</filename> compiler is what BitBake uses to
-        compile source files when creating the target image.
-        You can think of <filename>gcc-cross</filename> simply as an
-        automatically generated cross-compiler that is used internally within
-        BitBake only.
-        <note>
-            The extensible SDK does not use
-            <filename>gcc-cross-canadian</filename> since this SDK
-            ships a copy of the OpenEmbedded build system and the sysroot
-            within it contains <filename>gcc-cross</filename>.
-        </note>
-    </para>
-
-    <para>
-        The chain of events that occurs when <filename>gcc-cross</filename> is
-        bootstrapped is as follows:
-        <literallayout class='monospaced'>
-     gcc -> binutils-cross -> gcc-cross-initial -> linux-libc-headers -> glibc-initial -> glibc -> gcc-cross -> gcc-runtime
-        </literallayout>
-        <itemizedlist>
-            <listitem><para><filename>gcc</filename>:
-                The build host's GNU Compiler Collection (GCC).
-                </para></listitem>
-            <listitem><para><filename>binutils-cross</filename>:
-                The bare minimum binary utilities needed in order to run
-                the <filename>gcc-cross-initial</filename> phase of the
-                bootstrap operation.
-                </para></listitem>
-            <listitem><para><filename>gcc-cross-initial</filename>:
-                An early stage of the bootstrap process for creating
-                the cross-compiler.
-                This stage builds enough of the <filename>gcc-cross</filename>,
-                the C library, and other pieces needed to finish building the
-                final cross-compiler in later stages.
-                This tool is a "native" package (i.e. it is designed to run on
-                the build host).
-                </para></listitem>
-            <listitem><para><filename>linux-libc-headers</filename>:
-                Headers needed for the cross-compiler.
-                </para></listitem>
-            <listitem><para><filename>glibc-initial</filename>:
-                An initial version of the Embedded GLIBC needed to bootstrap
-                <filename>glibc</filename>.
-                </para></listitem>
-            <listitem><para><filename>gcc-cross</filename>:
-                The final stage of the bootstrap process for the
-                cross-compiler.
-                This stage results in the actual cross-compiler that
-                BitBake uses when it builds an image for a targeted
-                device.
-                <note>
-                    If you are replacing this cross compiler toolchain
-                    with a custom version, you must replace
-                    <filename>gcc-cross</filename>.
-                </note>
-                This tool is also a "native" package (i.e. it is
-                designed to run on the build host).
-                </para></listitem>
-            <listitem><para><filename>gcc-runtime</filename>:
-                Runtime libraries resulting from the toolchain bootstrapping
-                process.
-                This tool produces a binary that consists of the
-                runtime libraries need for the targeted device.
-                </para></listitem>
-        </itemizedlist>
-    </para>
-
-    <para>
-        You can use the OpenEmbedded build system to build an installer for
-        the relocatable SDK used to develop applications.
-        When you run the installer, it installs the toolchain, which contains
-        the development tools (e.g., the
-        <filename>gcc-cross-canadian</filename>),
-        <filename>binutils-cross-canadian</filename>, and other
-        <filename>nativesdk-*</filename> tools,
-        which are tools native to the SDK (i.e. native to
-        <link linkend='var-SDK_ARCH'><filename>SDK_ARCH</filename></link>),
-        you need to cross-compile and test your software.
-        The figure shows the commands you use to easily build out this
-        toolchain.
-        This cross-development toolchain is built to execute on the
-        <link linkend='var-SDKMACHINE'><filename>SDKMACHINE</filename></link>,
-        which might or might not be the same
-        machine as the Build Host.
-        <note>
-            If your target architecture is supported by the Yocto Project,
-            you can take advantage of pre-built images that ship with the
-            Yocto Project and already contain cross-development toolchain
-            installers.
-        </note>
-    </para>
-
-    <para>
-        Here is the bootstrap process for the relocatable toolchain:
-        <literallayout class='monospaced'>
-     gcc -> binutils-crosssdk -> gcc-crosssdk-initial -> linux-libc-headers ->
-        glibc-initial -> nativesdk-glibc -> gcc-crosssdk -> gcc-cross-canadian
-        </literallayout>
-        <itemizedlist>
-            <listitem><para><filename>gcc</filename>:
-                The build host's GNU Compiler Collection (GCC).
-                </para></listitem>
-            <listitem><para><filename>binutils-crosssdk</filename>:
-                The bare minimum binary utilities needed in order to run
-                the <filename>gcc-crosssdk-initial</filename> phase of the
-                bootstrap operation.
-                </para></listitem>
-            <listitem><para><filename>gcc-crosssdk-initial</filename>:
-                An early stage of the bootstrap process for creating
-                the cross-compiler.
-                This stage builds enough of the
-                <filename>gcc-crosssdk</filename> and supporting pieces so that
-                the final stage of the bootstrap process can produce the
-                finished cross-compiler.
-                This tool is a "native" binary that runs on the build host.
-                </para></listitem>
-            <listitem><para><filename>linux-libc-headers</filename>:
-                Headers needed for the cross-compiler.
-                </para></listitem>
-            <listitem><para><filename>glibc-initial</filename>:
-                An initial version of the Embedded GLIBC needed to bootstrap
-                <filename>nativesdk-glibc</filename>.
-                </para></listitem>
-            <listitem><para><filename>nativesdk-glibc</filename>:
-                The Embedded GLIBC needed to bootstrap the
-                <filename>gcc-crosssdk</filename>.
-                </para></listitem>
-            <listitem><para><filename>gcc-crosssdk</filename>:
-                The final stage of the bootstrap process for the
-                relocatable cross-compiler.
-                The <filename>gcc-crosssdk</filename> is a transitory compiler
-                and never leaves the build host.
-                Its purpose is to help in the bootstrap process to create the
-                eventual relocatable <filename>gcc-cross-canadian</filename>
-                compiler, which is relocatable.
-                This tool is also a "native" package (i.e. it is
-                designed to run on the build host).
-                </para></listitem>
-            <listitem><para><filename>gcc-cross-canadian</filename>:
-                The final relocatable cross-compiler.
-                When run on the
-                <link linkend='var-SDKMACHINE'><filename>SDKMACHINE</filename></link>,
-                this tool
-                produces executable code that runs on the target device.
-                Only one cross-canadian compiler is produced per architecture
-                since they can be targeted at different processor optimizations
-                using configurations passed to the compiler through the
-                compile commands.
-                This circumvents the need for multiple compilers and thus
-                reduces the size of the toolchains.
-                </para></listitem>
-        </itemizedlist>
-    </para>
-
-    <note>
-        For information on advantages gained when building a
-        cross-development toolchain installer, see the
-        "<ulink url='&YOCTO_DOCS_SDK_URL;#sdk-building-an-sdk-installer'>Building an SDK Installer</ulink>"
-        section in the Yocto Project Application Development and the
-        Extensible Software Development Kit (eSDK) manual.
-    </note>
-</section>
-
 <section id="shared-state-cache">
     <title>Shared State Cache</title>