Goals:
- Untangle dependency resolution and feature checking for better maintainability
- Improve performance of "make info-boards-supported"
Changes:
- Makefile.dep
- Dropped handling of default modules and recursion
- Now only dependencies of the current set of used modules and pkgs are
added
==> External recursion is needed to catch transient dependencies
- Changed Makefile.features:
- Dropped checking of provided features
- Dropped populating FEATURES_USED with provided features that are required
or optional
- Dropped populating FEATURES_MISSING with required but not provided
features
- Dropped adding modules implementing used features to USE_MODULE
==> This now only populates FEATURES_PROVIDED, nothing more
- Added makefiles/features_check.inc.mk:
- This performs the population of FEATURES_USED and FEATURES_MISSING now
- Added makefiles/features_modules.inc.mk:
- This performs now the addition of modules implementing used features
- Added makefiles/dependency_resolution.inc.mk:
- This now performs the recursion required to catch transient dependencies
- Also the feature check is performed recursively to handle also required
and optional features of the transient dependencies
- DEFAULT_MODULES are added repeatedly to allow it to be extended based on
used features and modules
==> This allows modules to have optional dependencies, as these
dependencies can be blacklisted
- Use simply expanded variables instead of recursively expended variables
(`foo := $(bar)` instead `foo = $(bar)`) for internal variables during feature
resolution. This improves performance significantly for
`make info-boards-supported`.
- Reduce dependency resolution steps in `make info-boards-supported`
- Globally resolve dependencies without any features (including arch)
provided
==> This results in the common subset of feature requirements and modules
used
- But for individual boards additional modules might be used on top due
to architecture specific dependencies or optional features
- Boards not supporting this subset of commonly required features are not
supported, so no additional dependency resolution is needed for them
- For each board supporting the common set of requirements a complete
dependency resolution is still needed to also catch architecture specific
hacks
- But this resolution is seeded with the common set of dependencies to
speed this up
RFC4648 specifies an alternate alphabet for base64 encoding / decoding
where '+' and '/' are exchanged for '-' and '-' to make the resulting
string safe to use in filenames and URLs.
This adds a base64url_encode() function that uses the alternate alphabet.
The base64_decode() function is extended to accept both alphabets.
This commit adds logic to make xtimer use ztimer_usec as backend
(instead of periph_timer). This allows ztimer_usec and xtimer to
coexist. It also allows xtimer to profit from eventually implemented
power mode blocking in ztimer's periph_timer backend.
The logic that adds auto_init_% DEFAULT_MODULES was placed at the end of
Makefile.dep, which is recursively included. That means that the logic
is executed multiple times.
This moves the logic so it is only executed once, when the break
condition of the iteration is met.
Currently default modules resolution is only performed in
Makefile.include. This avoids DEFAULT_MODULES being declared
in Makefile.dep since they never become USEMODULE.
Duplicate at the end of the dependency resolutiion after recursive
cach of transitive depdencies since at this stage DEFAULT_MODULES
can't and SHOULD NOT trigger depedency resolutions.
The addition of the `ecc` dependency was done after the recursion is done to
catch transient dependencies. This could potentially miss transient deps.
This commit moves the affected code before the recursion is triggered.
