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build_system: don't optionally use conflicting features

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If adding a provided but optional feature would result in a feature conflict,
don't use it.
This commit is contained in:
Marian Buschsieweke 2021-02-15 13:40:50 +01:00
parent ffdddc802e
commit 43781c3fba
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GPG Key ID: 61F64C6599B1539F
1 changed files with 19 additions and 3 deletions
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22
makefiles/features_check.inc.mk
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@ -1,7 +1,23 @@
# Check if all required FEATURES are provided
# Features that are provided and not blacklisted
FEATURES_USABLE := $(filter-out $(FEATURES_BLACKLIST),$(FEATURES_PROVIDED))
# Features that are used without taking "one out of" dependencies into account
FEATURES_USED_SO_FAR := $(sort $(FEATURES_REQUIRED) $(FEATURES_OPTIONAL_USED))
# Get features which inclusion would cause a conflict
# Parameter 1: Features currently used
# Parameter 2: A set of features that would conflict (separated by spaces)
# Algorithm: If interaction of the two lists is empty, return an empty set. Otherwise return
# the set of conflicting features without the feature in it that is already used
_features_would_conflict = $(if $(filter $1,$2),$(filter-out $1,$2))
# Adding any of the following features would result in a feature conflict with the already used
# features:
FEATURES_WOULD_CONFLICT := $(foreach conflict,$(FEATURES_CONFLICT),\
$(call _features_would_conflict,\
$(FEATURES_USED_SO_FAR),$(subst :, ,$(conflict))))
# Features that are provided, not blacklisted, and do not conflict with any used feature
FEATURES_USABLE := $(filter-out $(FEATURES_BLACKLIST) $(FEATURES_WOULD_CONFLICT),\
$(FEATURES_PROVIDED))
# Features that may be used, if provided.
FEATURES_OPTIONAL_ONLY := $(sort $(filter-out $(FEATURES_REQUIRED),$(FEATURES_OPTIONAL)))
@ -12,7 +28,7 @@ FEATURES_OPTIONAL_USED := $(sort $(filter $(FEATURES_USABLE),$(FEATURES_OPTIONAL
# Optional features that will not be used because they are not provided or blacklisted
FEATURES_OPTIONAL_MISSING := $(sort $(filter-out $(FEATURES_USABLE),$(FEATURES_OPTIONAL_ONLY)))
# Features that are used without taking "one out of" dependencies into account
# Update to account for change in FEATURES_OPTIONAL_USED
FEATURES_USED_SO_FAR := $(sort $(FEATURES_REQUIRED) $(FEATURES_OPTIONAL_USED))
# Additionally required features due to the "one out of" dependencies