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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>
This commit is contained in:
Scott Rifenbark
Richard Purdie
parent
707224b57a
commit
6bf7b263ff
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@ -94,7 +94,7 @@ TARFILES = overview-style.css overview-manual.html figures/overview-title.png \
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figures/source-fetching.png figures/patching.png figures/configuration-compile-autoreconf.png \
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figures/analysis-for-package-splitting.png figures/image-generation.png \
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figures/sdk-generation.png figures/images.png figures/sdk.png \
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figures/YP-flow-diagram.png \
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figures/YP-flow-diagram.png figures/cross-development-toolchains.png \
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eclipse
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MANUALS = $(DOC)/$(DOC).html $(DOC)/eclipse
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FIGURES = figures
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@ -282,7 +282,6 @@ XSLTOPTS = --xinclude
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ALLPREQ = html eclipse tarball
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TARFILES = ref-manual.html ref-style.css figures/poky-title.png \
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figures/buildhistory.png figures/buildhistory-web.png \
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figures/cross-development-toolchains.png \
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figures/building-an-image.png \
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figures/build-workspace-directory.png \
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eclipse
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Before Width: | Height: | Size: 58 KiB After Width: | Height: | Size: 58 KiB |
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@ -255,6 +255,222 @@
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</section>
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</section>
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<section id="cross-development-toolchain-generation">
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<title>Cross-Development Toolchain Generation</title>
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<para>
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The Yocto Project does most of the work for you when it comes to
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creating
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<ulink url='&YOCTO_DOCS_REF_URL;#cross-development-toolchain'>cross-development toolchains</ulink>.
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This section provides some technical background on how
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cross-development toolchains are created and used.
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For more information on toolchains, you can also see the
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<ulink url='&YOCTO_DOCS_SDK_URL;'>Yocto Project Application Development and the Extensible Software Development Kit (eSDK)</ulink>
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manual.
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</para>
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<para>
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In the Yocto Project development environment, cross-development
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toolchains are used to build the image and applications that run
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on the target hardware.
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With just a few commands, the OpenEmbedded build system creates
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these necessary toolchains for you.
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</para>
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<para>
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The following figure shows a high-level build environment regarding
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toolchain construction and use.
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</para>
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<para>
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<imagedata fileref="figures/cross-development-toolchains.png" width="8in" depth="6in" align="center" />
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</para>
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<para>
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Most of the work occurs on the Build Host.
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This is the machine used to build images and generally work within the
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the Yocto Project environment.
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When you run BitBake to create an image, the OpenEmbedded build system
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uses the host <filename>gcc</filename> compiler to bootstrap a
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cross-compiler named <filename>gcc-cross</filename>.
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The <filename>gcc-cross</filename> compiler is what BitBake uses to
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compile source files when creating the target image.
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You can think of <filename>gcc-cross</filename> simply as an
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automatically generated cross-compiler that is used internally within
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BitBake only.
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<note>
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The extensible SDK does not use
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<filename>gcc-cross-canadian</filename> since this SDK
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ships a copy of the OpenEmbedded build system and the sysroot
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within it contains <filename>gcc-cross</filename>.
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</note>
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</para>
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<para>
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The chain of events that occurs when <filename>gcc-cross</filename> is
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bootstrapped is as follows:
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<literallayout class='monospaced'>
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gcc -> binutils-cross -> gcc-cross-initial -> linux-libc-headers -> glibc-initial -> glibc -> gcc-cross -> gcc-runtime
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</literallayout>
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<itemizedlist>
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<listitem><para>
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<filename>gcc</filename>:
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The build host's GNU Compiler Collection (GCC).
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</para></listitem>
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<listitem><para>
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<filename>binutils-cross</filename>:
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The bare minimum binary utilities needed in order to run
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the <filename>gcc-cross-initial</filename> phase of the
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bootstrap operation.
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</para></listitem>
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<listitem><para>
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<filename>gcc-cross-initial</filename>:
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An early stage of the bootstrap process for creating
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the cross-compiler.
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This stage builds enough of the <filename>gcc-cross</filename>,
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the C library, and other pieces needed to finish building the
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final cross-compiler in later stages.
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This tool is a "native" package (i.e. it is designed to run on
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the build host).
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</para></listitem>
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<listitem><para>
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<filename>linux-libc-headers</filename>:
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Headers needed for the cross-compiler.
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</para></listitem>
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<listitem><para>
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<filename>glibc-initial</filename>:
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An initial version of the Embedded GLIBC needed to bootstrap
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<filename>glibc</filename>.
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</para></listitem>
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<listitem><para>
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<filename>gcc-cross</filename>:
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The final stage of the bootstrap process for the
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cross-compiler.
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This stage results in the actual cross-compiler that
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BitBake uses when it builds an image for a targeted
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device.
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<note>
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If you are replacing this cross compiler toolchain
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with a custom version, you must replace
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<filename>gcc-cross</filename>.
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</note>
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This tool is also a "native" package (i.e. it is
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designed to run on the build host).
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</para></listitem>
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<listitem><para>
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<filename>gcc-runtime</filename>:
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Runtime libraries resulting from the toolchain bootstrapping
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process.
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This tool produces a binary that consists of the
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runtime libraries need for the targeted device.
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</para></listitem>
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</itemizedlist>
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</para>
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<para>
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You can use the OpenEmbedded build system to build an installer for
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the relocatable SDK used to develop applications.
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When you run the installer, it installs the toolchain, which contains
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the development tools (e.g., the
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<filename>gcc-cross-canadian</filename>),
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<filename>binutils-cross-canadian</filename>, and other
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<filename>nativesdk-*</filename> tools,
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which are tools native to the SDK (i.e. native to
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<ulink url='&YOCTO_DOCS_REF_URL;#var-SDK_ARCH'><filename>SDK_ARCH</filename></ulink>),
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you need to cross-compile and test your software.
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The figure shows the commands you use to easily build out this
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toolchain.
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This cross-development toolchain is built to execute on the
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<ulink url='&YOCTO_DOCS_REF_URL;#var-SDKMACHINE'><filename>SDKMACHINE</filename></ulink>,
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which might or might not be the same
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machine as the Build Host.
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<note>
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If your target architecture is supported by the Yocto Project,
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you can take advantage of pre-built images that ship with the
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Yocto Project and already contain cross-development toolchain
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installers.
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</note>
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</para>
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<para>
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Here is the bootstrap process for the relocatable toolchain:
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<literallayout class='monospaced'>
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gcc -> binutils-crosssdk -> gcc-crosssdk-initial -> linux-libc-headers ->
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glibc-initial -> nativesdk-glibc -> gcc-crosssdk -> gcc-cross-canadian
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</literallayout>
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<itemizedlist>
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<listitem><para>
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<filename>gcc</filename>:
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The build host's GNU Compiler Collection (GCC).
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</para></listitem>
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<listitem><para>
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<filename>binutils-crosssdk</filename>:
|
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The bare minimum binary utilities needed in order to run
|
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the <filename>gcc-crosssdk-initial</filename> phase of the
|
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bootstrap operation.
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</para></listitem>
|
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<listitem><para>
|
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<filename>gcc-crosssdk-initial</filename>:
|
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An early stage of the bootstrap process for creating
|
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the cross-compiler.
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This stage builds enough of the
|
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<filename>gcc-crosssdk</filename> and supporting pieces so that
|
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the final stage of the bootstrap process can produce the
|
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finished cross-compiler.
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This tool is a "native" binary that runs on the build host.
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</para></listitem>
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<listitem><para>
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<filename>linux-libc-headers</filename>:
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Headers needed for the cross-compiler.
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</para></listitem>
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<listitem><para>
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<filename>glibc-initial</filename>:
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An initial version of the Embedded GLIBC needed to bootstrap
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<filename>nativesdk-glibc</filename>.
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</para></listitem>
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<listitem><para>
|
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<filename>nativesdk-glibc</filename>:
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The Embedded GLIBC needed to bootstrap the
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<filename>gcc-crosssdk</filename>.
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</para></listitem>
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<listitem><para>
|
||||
<filename>gcc-crosssdk</filename>:
|
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The final stage of the bootstrap process for the
|
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relocatable cross-compiler.
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The <filename>gcc-crosssdk</filename> is a transitory compiler
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and never leaves the build host.
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Its purpose is to help in the bootstrap process to create the
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eventual relocatable <filename>gcc-cross-canadian</filename>
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compiler, which is relocatable.
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This tool is also a "native" package (i.e. it is
|
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designed to run on the build host).
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</para></listitem>
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<listitem><para>
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<filename>gcc-cross-canadian</filename>:
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The final relocatable cross-compiler.
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When run on the
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<ulink url='&YOCTO_DOCS_REF_URL;#var-SDKMACHINE'><filename>SDKMACHINE</filename></ulink>,
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this tool
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produces executable code that runs on the target device.
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Only one cross-canadian compiler is produced per architecture
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since they can be targeted at different processor optimizations
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using configurations passed to the compiler through the
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compile commands.
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This circumvents the need for multiple compilers and thus
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reduces the size of the toolchains.
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</para></listitem>
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</itemizedlist>
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</para>
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<note>
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For information on advantages gained when building a
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cross-development toolchain installer, see the
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"<ulink url='&YOCTO_DOCS_SDK_URL;#sdk-building-an-sdk-installer'>Building an SDK Installer</ulink>"
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section in the Yocto Project Application Development and the
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Extensible Software Development Kit (eSDK) manual.
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</note>
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</section>
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<section id='x32'>
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<title>x32 psABI</title>
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@ -2426,8 +2426,8 @@
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<note>
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For more information on the cross-development toolchain
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generation, see the
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"<ulink url='&YOCTO_DOCS_REF_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
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section in the Yocto Project Reference Manual.
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"<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
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section.
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For information on advantages gained when building a
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cross-development toolchain using the
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<ulink url='&YOCTO_DOCS_REF_URL;#ref-tasks-populate_sdk'><filename>do_populate_sdk</filename></ulink>
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|
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@ -2792,8 +2792,8 @@
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<listitem><para>
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For background information on cross-development toolchains
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in the Yocto Project development environment, see the
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"<ulink url='&YOCTO_DOCS_REF_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
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section in the Yocto Project Reference Manual.
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"<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
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section.
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</para></listitem>
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<listitem><para>
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For information on setting up a cross-development
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|
|
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@ -568,8 +568,9 @@
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provides support for the recipes that build the Canadian
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Cross-compilation tools for SDKs.
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See the
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"<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
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section for more discussion on these cross-compilation tools.
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"<ulink url='&YOCTO_DOCS_OVERVIEW_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
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section in the Yocto Project Overview Manual for more discussion on
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these cross-compilation tools.
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</para>
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</section>
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@ -581,8 +582,9 @@
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provides support for the recipes that build the cross-compilation
|
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tools used for building SDKs.
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See the
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"<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
|
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section for more discussion on these cross-compilation tools.
|
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"<ulink url='&YOCTO_DOCS_OVERVIEW_URL;#cross-development-toolchain-generation'>Cross-Development Toolchain Generation</ulink>"
|
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section in the Yocto Project Overview Manual for more discussion on
|
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these cross-compilation tools.
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</para>
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</section>
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|
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@ -2720,8 +2722,8 @@ This check was removed for YP 2.3 release
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<para>
|
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For more information on the cross-development toolchain
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generation, see the
|
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"<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>
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|
|
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|
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@ -181,8 +181,8 @@
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<para>Creation of these toolchains is simple and automated.
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For information on toolchain concepts as they apply to the
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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>
|
||||
|
|
|
|||
|
|
@ -15183,8 +15183,8 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
|
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<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>
|
||||
|
|
|
|||
|
|
@ -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>
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user