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doc: add documentation on dependency debug targets

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Add short documentation for the dependency resolution debug targets.
Point to the main files for more infos.
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Gaëtan Harter 2019-10-07 16:13:40 +02:00
parent 7d0b922e98
commit 9940a15bcc
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doc/doxygen/src/advanced-build-system-tricks.md
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@ -38,3 +38,38 @@ You can configure your own files that will be parsed by the build system main
* Specify a hard written `PORT` / `DEBUG_ADAPTER_ID` for some BOARD values
* Define your custom targets
* Override default targets
Analyze dependency resolution {#analyze-depedency-resolution}
=============================
When refactoring dependency handling or modifying variables used for dependency
resolution, one may want to evaluate the impact on the existing applications.
This describe some debug targets to dump variables used during dependency
resolution.
To analyze one board and application run the following commands in an
application directory.
Generate the variables dump with the normal dependency resolution to a
`dependencies_info_board_name` file:
~~~~~~~~~~~~~~~~~~~
BOARD=board_name make dependency-debug
~~~~~~~~~~~~~~~~~~~
Or with the "quick" version used by murdock to know supported boards
(this is an incomplete resolution, details in `makefiles/dependencies_debug.inc.mk`)
to a `dependencies_info-boards-supported_board_name` file:
~~~~~~~~~~~~~~~~~~~
BOARDS=board_name DEPENDENCY_DEBUG=1 make info-boards-supported
~~~~~~~~~~~~~~~~~~~
For more configuration and usage details, see in the file defining the targets
`makefiles/dependencies_debug.inc.mk`
To do a repository wide analysis, you can use the script
`dist/tools/buildsystem_sanity_check/save_all_dependencies_resolution_variables.sh`
that will generate the output for all boards and applications.
It currently take around 2 hours on an 8 cores machine with ssd.