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+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+Finding Temporary Source Code
+*****************************
+
+You might find it helpful during development to modify the temporary
+source code used by recipes to build packages. For example, suppose you
+are developing a patch and you need to experiment a bit to figure out
+your solution. After you have initially built the package, you can
+iteratively tweak the source code, which is located in the
+:term:`Build Directory`, and then you can force a re-compile and quickly
+test your altered code. Once you settle on a solution, you can then preserve
+your changes in the form of patches.
+
+During a build, the unpacked temporary source code used by recipes to
+build packages is available in the :term:`Build Directory` as defined by the
+:term:`S` variable. Below is the default value for the :term:`S` variable as
+defined in the ``meta/conf/bitbake.conf`` configuration file in the
+:term:`Source Directory`::
+
+   S = "${WORKDIR}/${BP}"
+
+You should be aware that many recipes override the
+:term:`S` variable. For example, recipes that fetch their source from Git
+usually set :term:`S` to ``${WORKDIR}/git``.
+
+.. note::
+
+   The :term:`BP` represents the base recipe name, which consists of the name
+   and version::
+
+           BP = "${BPN}-${PV}"
+
+
+The path to the work directory for the recipe
+(:term:`WORKDIR`) is defined as
+follows::
+
+   ${TMPDIR}/work/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}
+
+The actual directory depends on several things:
+
+-  :term:`TMPDIR`: The top-level build
+   output directory.
+
+-  :term:`MULTIMACH_TARGET_SYS`:
+   The target system identifier.
+
+-  :term:`PN`: The recipe name.
+
+-  :term:`EXTENDPE`: The epoch --- if
+   :term:`PE` is not specified, which is
+   usually the case for most recipes, then :term:`EXTENDPE` is blank.
+
+-  :term:`PV`: The recipe version.
+
+-  :term:`PR`: The recipe revision.
+
+As an example, assume a Source Directory top-level folder named
+``poky``, a default :term:`Build Directory` at ``poky/build``, and a
+``qemux86-poky-linux`` machine target system. Furthermore, suppose your
+recipe is named ``foo_1.3.0.bb``. In this case, the work directory the
+build system uses to build the package would be as follows::
+
+   poky/build/tmp/work/qemux86-poky-linux/foo/1.3.0-r0
+