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) CC="$(CC)" CXX="$(CXX)" 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 \
47 libelf-getshdrstrndx \
50 numa_num_possible_cpus \
60 pthread-attr-setaffinity-np \
75 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
76 # of all feature tests
77 FEATURE_TESTS_EXTRA := \
86 libunwind-debug-frame \
87 libunwind-debug-frame-arm \
88 libunwind-debug-frame-aarch64 \
94 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
96 ifeq ($(FEATURE_TESTS),all)
97 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
109 numa_num_possible_cpus \
121 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
122 # If in the future we need per-feature checks/flags for features not
123 # mentioned in this list we need to refactor this ;-).
124 set_test_all_flags = $(eval $(set_test_all_flags_code))
125 define set_test_all_flags_code
126 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
127 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
130 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
133 # Special fast-path for the 'all features are available' case:
135 $(call feature_check,all,$(MSG))
138 # Just in case the build freshly failed, make sure we print the
141 ifeq ($(feature-all), 1)
143 # test-all.c passed - just set all the core feature flags to 1:
145 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
147 # test-all.c does not comprise these tests, so we need to
148 # for this case to get features proper values
150 $(call feature_check,compile-32)
151 $(call feature_check,compile-x32)
152 $(call feature_check,bionic)
153 $(call feature_check,libbabeltrace)
155 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
159 # Print the result of the feature test:
161 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
163 define feature_print_status_code
164 ifeq ($(feature-$(1)), 1)
165 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
167 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
171 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
172 define feature_print_text_code
173 MSG = $(shell printf '...%30s: %s' $(1) $(2))
177 # generates feature value assignment for name, like:
178 # $(call feature_assign,dwarf) == feature-dwarf=1
180 feature_assign = feature-$(1)=$(feature-$(1))
182 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
183 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
185 feature_dump_check = $(eval $(feature_dump_check_code))
186 define feature_dump_check_code
187 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
193 # First check if any test from FEATURE_DISPLAY
194 # and set feature_display := 1 if it does
195 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
198 # Now also check if any other test changed,
199 # so we force FEATURE-DUMP generation
200 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
202 # The $(feature_display) controls the default detection message
203 # output. It's set if:
204 # - detected features differes from stored features from
205 # last build (in $(FEATURE_DUMP_FILENAME) file)
206 # - one of the $(FEATURE_DISPLAY) is not detected
209 ifeq ($(feature_dump_changed),1)
210 $(shell rm -f $(FEATURE_DUMP_FILENAME))
211 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
214 feature_display_check = $(eval $(feature_check_display_code))
215 define feature_check_display_code
216 ifneq ($(feature-$(1)), 1)
221 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
228 ifeq ($(feature_display),1)
230 $(info Auto-detecting system features:)
231 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
232 ifneq ($(feature_verbose),1)
237 ifeq ($(feature_verbose),1)
238 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
239 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))