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(From yocto-docs rev: 25ea8e2a0428b6cb66402283e64144d5ce61daf6) Signed-off-by: Alexander Kanavin <alex@linutronix.de> Signed-off-by: Antonin Godard <antonin.godard@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
74 lines
2.5 KiB
ReStructuredText
74 lines
2.5 KiB
ReStructuredText
.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
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Finding Temporary Source Code
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*****************************
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You might find it helpful during development to modify the temporary
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source code used by recipes to build packages. For example, suppose you
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are developing a patch and you need to experiment a bit to figure out
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your solution. After you have initially built the package, you can
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iteratively tweak the source code, which is located in the
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:term:`Build Directory`, and then you can force a re-compile and quickly
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test your altered code. Once you settle on a solution, you can then preserve
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your changes in the form of patches.
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During a build, the unpacked temporary source code used by recipes to
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build packages is available in the :term:`Build Directory` as defined by the
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:term:`S` variable. Below is the default value for the :term:`S` variable as
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defined in the ``meta/conf/bitbake.conf`` configuration file in the
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:term:`Source Directory`::
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S = "${UNPACKDIR}/${BP}"
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You should be aware that many recipes override the
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:term:`S` variable when the default isn't accurate.
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.. note::
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The :term:`BP` represents the base recipe name, which consists of the name
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and version::
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BP = "${BPN}-${PV}"
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This matches the location that the git fetcher unpacks to, and usually
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matches unpacked content of release tarballs (e.g. they contain a single
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directory which matches value of ${BP} exactly).
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The path to the unpack directory for the recipe
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(:term:`UNPACKDIR`) is defined as follows::
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${WORKDIR}/sources
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In turn, the path to the work directory for the recipe
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(:term:`WORKDIR`) is defined as
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follows::
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${TMPDIR}/work/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}
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The actual directory depends on several things:
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- :term:`TMPDIR`: The top-level build
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output directory.
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- :term:`MULTIMACH_TARGET_SYS`:
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The target system identifier.
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- :term:`PN`: The recipe name.
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- :term:`EXTENDPE`: The epoch --- if
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:term:`PE` is not specified, which is
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usually the case for most recipes, then :term:`EXTENDPE` is blank.
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- :term:`PV`: The recipe version.
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- :term:`PR`: The recipe revision.
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As an example, assume a Source Directory top-level folder named
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``poky``, a default :term:`Build Directory` at ``poky/build``, and a
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``qemux86-poky-linux`` machine target system. Furthermore, suppose your
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recipe is named ``foo_1.3.0.bb``. In this case, the work directory the
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build system uses to build the package would be as follows::
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poky/build/tmp/work/qemux86-poky-linux/foo/1.3.0-r0
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