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ref-manual: add description for the "sysroot" term
This term is used throughout the manual but is not properly introduced anywhere. (From yocto-docs rev: ced1bbb88a8046b1307376cd88ea85110677c9fc) Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com> Signed-off-by: Steve Sakoman <steve@sakoman.com>
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@ -483,6 +483,31 @@ universal, the list includes them just in case:
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and the ":ref:`dev-manual/sbom:creating a software bill of materials`"
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section of the Development Tasks manual.
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:term:`Sysroot`
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When cross-compiling, the target file system may be differently laid
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out and contain different things compared to the host system. The concept
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of a *sysroot* is directory which looks like the target filesystem and
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can be used to cross-compile against.
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In the context of cross-compiling toolchains, a *sysroot*
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typically contains C library and kernel headers, plus the
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compiled binaries for the C library. A *multilib toolchain*
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can contain multiple variants of the C library binaries,
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each compiled for a target instruction set (such as ``armv5``,
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``armv7`` and ``armv8``), and possibly optimized for a specific CPU core.
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In the more specific context of the OpenEmbedded build System and
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of the Yocto Project, each recipe has two sysroots:
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- A *target sysroot* contains all the **target** libraries and headers
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needed to build the recipe.
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- A *native sysroot* contains all the **host** files and executables
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needed to build the recipe.
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See the :term:`SYSROOT_* <SYSROOT_DESTDIR>` variables controlling
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how sysroots are created and stored.
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:term:`Task`
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A per-recipe unit of execution for BitBake (e.g.
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:ref:`ref-tasks-compile`,
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