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RIOT/Makefile.features

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build system: Restructure dependency resolution 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
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# Process provided FEATURES
#
# The board/board common are responsible for defining the CPU and CPU_MODEL
# variables in their Makefile.features.
# This makes them available when setting features based on CPU_MODEL in the cpu
# Makefile.features and also during dependency resolution.
# Transition:
# Moving 'CPU/CPU_MODEL' to Makefile.features is an ongoing work and may not
# reflect the state of all boards for the moment.
include $(BOARDDIR)/Makefile.features
# Sanity check
ifeq (,$(CPU))
$(error $(BOARD): CPU must be defined by board / board_common Makefile.features)
endif
include $(RIOTCPU)/$(CPU)/Makefile.features
# Provide CPU as a feature to allow listing all boards with a CPU
FEATURES_PROVIDED += cpu_$(CPU)
2021-01-26 14:55:40 +01:00
# Features that are conflicting for all architectures
FEATURES_CONFLICT += picolibc:newlib
FEATURES_CONFLICT_MSG += "Only one standard C library can be used."
FEATURES_CONFLICT += periph_gpio_irq:periph_gpio_ll_irq
FEATURES_CONFLICT_MSG += "Only one GPIO IRQ implementation can be used."
FEATURES_CONFLICT += periph_usbdev:tinyusb_device
FEATURES_CONFLICT += periph_usbdev:tinyusb_host
FEATURES_CONFLICT_MSG += "Package tinyUSB is not yet compatible with periph_usbdev."
# Features provided implicitly
ifneq (,$(filter periph_eth,$(FEATURES_PROVIDED)))
FEATURES_PROVIDED += netif_ethernet
endif
ifneq (,$(filter netif_%,$(FEATURES_PROVIDED)))
FEATURES_PROVIDED += netif
endif