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))" CXXFLAGS="$(EXTRA_CXXFLAGS) $(FEATURE_CHECK_CXXFLAGS-$(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 := \
36 sync-compare-and-swap \
37 get_current_dir_name \
46 libelf-getshdrstrndx \
49 numa_num_possible_cpus \
56 pthread-attr-setaffinity-np \
71 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
72 # of all feature tests
73 FEATURE_TESTS_EXTRA := \
87 libunwind-debug-frame \
88 libunwind-debug-frame-arm \
89 libunwind-debug-frame-aarch64 \
95 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
97 ifeq ($(FEATURE_TESTS),all)
98 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
110 numa_num_possible_cpus \
123 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
124 # If in the future we need per-feature checks/flags for features not
125 # mentioned in this list we need to refactor this ;-).
126 set_test_all_flags = $(eval $(set_test_all_flags_code))
127 define set_test_all_flags_code
128 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
129 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
132 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
135 # Special fast-path for the 'all features are available' case:
137 $(call feature_check,all,$(MSG))
140 # Just in case the build freshly failed, make sure we print the
143 ifeq ($(feature-all), 1)
145 # test-all.c passed - just set all the core feature flags to 1:
147 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
149 # test-all.c does not comprise these tests, so we need to
150 # for this case to get features proper values
152 $(call feature_check,compile-32)
153 $(call feature_check,compile-x32)
154 $(call feature_check,bionic)
155 $(call feature_check,libbabeltrace)
157 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
161 # Print the result of the feature test:
163 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
165 define feature_print_status_code
166 ifeq ($(feature-$(1)), 1)
167 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
169 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
173 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
174 define feature_print_text_code
175 MSG = $(shell printf '...%30s: %s' $(1) $(2))
179 # generates feature value assignment for name, like:
180 # $(call feature_assign,dwarf) == feature-dwarf=1
182 feature_assign = feature-$(1)=$(feature-$(1))
184 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
185 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
187 feature_dump_check = $(eval $(feature_dump_check_code))
188 define feature_dump_check_code
189 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
195 # First check if any test from FEATURE_DISPLAY
196 # and set feature_display := 1 if it does
197 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
200 # Now also check if any other test changed,
201 # so we force FEATURE-DUMP generation
202 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
204 # The $(feature_display) controls the default detection message
205 # output. It's set if:
206 # - detected features differes from stored features from
207 # last build (in $(FEATURE_DUMP_FILENAME) file)
208 # - one of the $(FEATURE_DISPLAY) is not detected
211 ifeq ($(feature_dump_changed),1)
212 $(shell rm -f $(FEATURE_DUMP_FILENAME))
213 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
216 feature_display_check = $(eval $(feature_check_display_code))
217 define feature_check_display_code
218 ifneq ($(feature-$(1)), 1)
223 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
230 ifeq ($(feature_display),1)
232 $(info Auto-detecting system features:)
233 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
234 ifneq ($(feature_verbose),1)
239 ifeq ($(feature_verbose),1)
240 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
241 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))