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 \
70 disassembler-four-args
72 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
73 # of all feature tests
74 FEATURE_TESTS_EXTRA := \
88 libunwind-debug-frame \
89 libunwind-debug-frame-arm \
90 libunwind-debug-frame-aarch64 \
96 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
98 ifeq ($(FEATURE_TESTS),all)
99 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
111 numa_num_possible_cpus \
123 disassembler-four-args
125 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
126 # If in the future we need per-feature checks/flags for features not
127 # mentioned in this list we need to refactor this ;-).
128 set_test_all_flags = $(eval $(set_test_all_flags_code))
129 define set_test_all_flags_code
130 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
131 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
134 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
137 # Special fast-path for the 'all features are available' case:
139 $(call feature_check,all,$(MSG))
142 # Just in case the build freshly failed, make sure we print the
145 ifeq ($(feature-all), 1)
147 # test-all.c passed - just set all the core feature flags to 1:
149 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
151 # test-all.c does not comprise these tests, so we need to
152 # for this case to get features proper values
154 $(call feature_check,compile-32)
155 $(call feature_check,compile-x32)
156 $(call feature_check,bionic)
157 $(call feature_check,libbabeltrace)
159 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
163 # Print the result of the feature test:
165 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
167 define feature_print_status_code
168 ifeq ($(feature-$(1)), 1)
169 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
171 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
175 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
176 define feature_print_text_code
177 MSG = $(shell printf '...%30s: %s' $(1) $(2))
181 # generates feature value assignment for name, like:
182 # $(call feature_assign,dwarf) == feature-dwarf=1
184 feature_assign = feature-$(1)=$(feature-$(1))
186 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
187 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
189 feature_dump_check = $(eval $(feature_dump_check_code))
190 define feature_dump_check_code
191 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
197 # First check if any test from FEATURE_DISPLAY
198 # and set feature_display := 1 if it does
199 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
202 # Now also check if any other test changed,
203 # so we force FEATURE-DUMP generation
204 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
206 # The $(feature_display) controls the default detection message
207 # output. It's set if:
208 # - detected features differes from stored features from
209 # last build (in $(FEATURE_DUMP_FILENAME) file)
210 # - one of the $(FEATURE_DISPLAY) is not detected
213 ifeq ($(feature_dump_changed),1)
214 $(shell rm -f $(FEATURE_DUMP_FILENAME))
215 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
218 feature_display_check = $(eval $(feature_check_display_code))
219 define feature_check_display_code
220 ifneq ($(feature-$(1)), 1)
225 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
232 ifeq ($(feature_display),1)
234 $(info Auto-detecting system features:)
235 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
236 ifneq ($(feature_verbose),1)
241 ifeq ($(feature_verbose),1)
242 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
243 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))