1 feature_dir := $(srctree)/tools/build/feature
4 OUTPUT_FEATURES = $(OUTPUT)feature/
5 $(shell mkdir -p $(OUTPUT_FEATURES))
8 feature_check = $(eval $(feature_check_code))
9 define feature_check_code
10 feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C $(feature_dir) test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0)
13 feature_set = $(eval $(feature_set_code))
14 define feature_set_code
19 # Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
23 # Note that this is not a complete list of all feature tests, just
24 # those that are typically built on a fully configured system.
26 # [ Feature tests not mentioned here have to be built explicitly in
27 # the rule that uses them - an example for that is the 'bionic'
34 sync-compare-and-swap \
44 numa_num_possible_cpus \
50 pthread-attr-setaffinity-np \
66 numa_num_possible_cpus \
76 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
77 # If in the future we need per-feature checks/flags for features not
78 # mentioned in this list we need to refactor this ;-).
79 set_test_all_flags = $(eval $(set_test_all_flags_code))
80 define set_test_all_flags_code
81 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
82 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
85 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
88 # Special fast-path for the 'all features are available' case:
90 $(call feature_check,all,$(MSG))
93 # Just in case the build freshly failed, make sure we print the
96 ifeq ($(feature-all), 1)
98 # test-all.c passed - just set all the core feature flags to 1:
100 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
102 $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS)" LDFLAGS=$(LDFLAGS) -i -j -C $(feature_dir) $(addsuffix .bin,$(FEATURE_TESTS)) >/dev/null 2>&1)
103 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
107 # Print the result of the feature test:
109 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
111 define feature_print_status_code
112 ifeq ($(feature-$(1)), 1)
113 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
115 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
119 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
120 define feature_print_text_code
121 MSG = $(shell printf '...%30s: %s' $(1) $(2))
124 FEATURE_DUMP := $(foreach feat,$(FEATURE_DISPLAY),feature-$(feat)($(feature-$(feat))))
125 FEATURE_DUMP_FILE := $(shell touch $(OUTPUT)FEATURE-DUMP; cat $(OUTPUT)FEATURE-DUMP)
127 ifeq ($(dwarf-post-unwind),1)
128 FEATURE_DUMP += dwarf-post-unwind($(dwarf-post-unwind-text))
131 # The $(feature_display) controls the default detection message
132 # output. It's set if:
133 # - detected features differes from stored features from
134 # last build (in FEATURE-DUMP file)
135 # - one of the $(FEATURE_DISPLAY) is not detected
138 ifneq ("$(FEATURE_DUMP)","$(FEATURE_DUMP_FILE)")
139 $(shell echo "$(FEATURE_DUMP)" > $(OUTPUT)FEATURE-DUMP)
143 feature_display_check = $(eval $(feature_check_code))
144 define feature_display_check_code
145 ifneq ($(feature-$(1)), 1)
150 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
157 ifeq ($(feature_display),1)
159 $(info Auto-detecting system features:)
160 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
162 ifeq ($(dwarf-post-unwind),1)
163 $(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
166 ifneq ($(feature_verbose),1)
171 ifeq ($(feature_verbose),1)
172 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
173 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))