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) $(OUTPUT_FEATURES)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'
30 FEATURE_TESTS_BASIC := \
35 sync-compare-and-swap \
44 libelf-getshdrstrndx \
47 numa_num_possible_cpus \
58 pthread-attr-setaffinity-np \
67 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
68 # of all feature tests
69 FEATURE_TESTS_EXTRA := \
78 libunwind-debug-frame \
79 libunwind-debug-frame-arm \
80 libunwind-debug-frame-aarch64
82 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
84 ifeq ($(FEATURE_TESTS),all)
85 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
97 numa_num_possible_cpus \
109 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
110 # If in the future we need per-feature checks/flags for features not
111 # mentioned in this list we need to refactor this ;-).
112 set_test_all_flags = $(eval $(set_test_all_flags_code))
113 define set_test_all_flags_code
114 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
115 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
118 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
121 # Special fast-path for the 'all features are available' case:
123 $(call feature_check,all,$(MSG))
126 # Just in case the build freshly failed, make sure we print the
129 ifeq ($(feature-all), 1)
131 # test-all.c passed - just set all the core feature flags to 1:
133 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
135 # test-all.c does not comprise these tests, so we need to
136 # for this case to get features proper values
138 $(call feature_check,compile-32)
139 $(call feature_check,compile-x32)
140 $(call feature_check,bionic)
141 $(call feature_check,libbabeltrace)
143 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
147 # Print the result of the feature test:
149 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
151 define feature_print_status_code
152 ifeq ($(feature-$(1)), 1)
153 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
155 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
159 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
160 define feature_print_text_code
161 MSG = $(shell printf '...%30s: %s' $(1) $(2))
165 # generates feature value assignment for name, like:
166 # $(call feature_assign,dwarf) == feature-dwarf=1
168 feature_assign = feature-$(1)=$(feature-$(1))
170 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
171 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
173 feature_dump_check = $(eval $(feature_dump_check_code))
174 define feature_dump_check_code
175 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
181 # First check if any test from FEATURE_DISPLAY
182 # and set feature_display := 1 if it does
183 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
186 # Now also check if any other test changed,
187 # so we force FEATURE-DUMP generation
188 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
190 # The $(feature_display) controls the default detection message
191 # output. It's set if:
192 # - detected features differes from stored features from
193 # last build (in $(FEATURE_DUMP_FILENAME) file)
194 # - one of the $(FEATURE_DISPLAY) is not detected
197 ifeq ($(feature_dump_changed),1)
198 $(shell rm -f $(FEATURE_DUMP_FILENAME))
199 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
202 feature_display_check = $(eval $(feature_check_display_code))
203 define feature_check_display_code
204 ifneq ($(feature-$(1)), 1)
209 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
216 ifeq ($(feature_display),1)
218 $(info Auto-detecting system features:)
219 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
220 ifneq ($(feature_verbose),1)
225 ifeq ($(feature_verbose),1)
226 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
227 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))