tinnedkarma commented on code in PR #17162:
URL: https://github.com/apache/nuttx/pull/17162#discussion_r2527161955
##########
Documentation/implementation/make_build_system.rst:
##########
@@ -66,11 +66,136 @@ The ``V`` variable can be passed to ``make`` to control
the build verbosity.
# V=2: Enable bug/verbose options in tools and scripts
$ make V=2
-Build Flow
-----------
+Build Process
+-------------
+
+.. note::
+
+ Most of the configuration step documentation and adjacent tooling should be
+ documented separately. Most of what is presented here will be moved.
+
+The ``Make`` based build process starts with the NuttX tree configuration.
+This is done by running ``tools/configure.sh`` script.
+
+During configuration, some symlinks are created.
+
+- the "current" chip directory gets symlinked to ``nutt/include/arch/chip``.
+- the "current" board directory gets symlinked to ``nutt/include/arch/board``.
+- the "current" arch directory gets symlinked to ``nutt/include/arch``.
+
+Each board should also supply an ``scripts/Make.defs`` file.
+The board ``Make.defs`` file should:
+
+- include the complete .config file.
+- include the :ref:`config_mk`
+- include the arch-specific toolchain.
+- set the linker file used for linking. (``LDSCRIPT``)
+- set the compiler flags needed for the board.
+
+The board config is stored as ``defconfig`` file, which is a minimal config,
+storing only the configs that differs from default config values.
+Due to NuttX's particularity of strict dependance to the ``app``
+directory, the ``.config`` file is not generated by either ``kconfiglib`` or
+``kconfig-frontends``, but rather by the an in-tree ``tools/process_config.sh``
+script. This script take a "base" input file (the boards ``defconfig`` file),
+additional include paths (the most relevant being the ``apps`` top directory),
+and generate an output file (the ``$(TOPDIR)/.config`` file).
+
+.. code-block:: bash
+
+ # part of configure.sh shell script, starting at line 240
+ #
+ # src_config=${configpath}/defconfig
+ # dest_config="${TOPDIR}/.config"
+ # original_config="${TOPDIR}/.config.orig"
+ # backup_config="${TOPDIR}/defconfig"
+
+ $ ln -sf ${src_makedefs} ${dest_makedefs} || \
+ { echo "Failed to symlink ${src_makedefs}" ; exit 8 ; }
+ $ ${TOPDIR}/tools/process_config.sh -I ${configpath}/../../common/configs \
+ -I ${configpath}/../common \
+ -I ${configpath} -I ${TOPDIR}/../apps \
+ -I ${TOPDIR}/../nuttx-apps \
+ -o ${dest_config} ${src_config}
+
+Starting the Build
+^^^^^^^^^^^^^^^^^^
The root **Makefile** is the build process entrypoint. Its main job is
to check for a ``.config`` file and include the appropriate **host-specific
Makefile**.
+The "actual" first steps of the build process are handled by the host-specific
+**Makefile** (either ``Win.mk`` or ``Unix.mk``).
+
+Early on, during parsing, both host-specific **Makefile** will also include
+
+- board's ``Make.defs`` file mentioned above. this will include also
+ - the main ``.config`` file.
+ - the tools ``config.mk`` file.
+ - the arch ``toolchain.defs`` file.
+- based on the build mode, one of the following files:
+ - :ref:`flatlibs_mk`
+ - :ref:`protectedlibs_mk`
+ - :ref:`kernelibs_mk`
+- :ref:`directories_mk`
Review Comment:
Hi, it should not be aligned. It should include either flat, protected or
kernel, and always directories.mk
<img width="724" height="303" alt="image"
src="https://github.com/user-attachments/assets/b4ed6e25-c4ed-49a5-8f95-f7ec9ccebf54";
/>
I did mess up the list rendering, now it's fixed.
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