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 := \
35 sync-compare-and-swap \
44 libelf-getshdrstrndx \
47 numa_num_possible_cpus \
58 pthread-attr-setaffinity-np \
72 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
73 # of all feature tests
74 FEATURE_TESTS_EXTRA := \
83 libunwind-debug-frame \
84 libunwind-debug-frame-arm \
85 libunwind-debug-frame-aarch64 \
91 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
93 ifeq ($(FEATURE_TESTS),all)
94 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
106 numa_num_possible_cpus \
118 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
119 # If in the future we need per-feature checks/flags for features not
120 # mentioned in this list we need to refactor this ;-).
121 set_test_all_flags = $(eval $(set_test_all_flags_code))
122 define set_test_all_flags_code
123 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
124 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
127 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
130 # Special fast-path for the 'all features are available' case:
132 $(call feature_check,all,$(MSG))
135 # Just in case the build freshly failed, make sure we print the
138 ifeq ($(feature-all), 1)
140 # test-all.c passed - just set all the core feature flags to 1:
142 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
144 # test-all.c does not comprise these tests, so we need to
145 # for this case to get features proper values
147 $(call feature_check,compile-32)
148 $(call feature_check,compile-x32)
149 $(call feature_check,bionic)
150 $(call feature_check,libbabeltrace)
152 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
156 # Print the result of the feature test:
158 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
160 define feature_print_status_code
161 ifeq ($(feature-$(1)), 1)
162 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
164 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
168 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
169 define feature_print_text_code
170 MSG = $(shell printf '...%30s: %s' $(1) $(2))
174 # generates feature value assignment for name, like:
175 # $(call feature_assign,dwarf) == feature-dwarf=1
177 feature_assign = feature-$(1)=$(feature-$(1))
179 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
180 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
182 feature_dump_check = $(eval $(feature_dump_check_code))
183 define feature_dump_check_code
184 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
190 # First check if any test from FEATURE_DISPLAY
191 # and set feature_display := 1 if it does
192 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
195 # Now also check if any other test changed,
196 # so we force FEATURE-DUMP generation
197 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
199 # The $(feature_display) controls the default detection message
200 # output. It's set if:
201 # - detected features differes from stored features from
202 # last build (in $(FEATURE_DUMP_FILENAME) file)
203 # - one of the $(FEATURE_DISPLAY) is not detected
206 ifeq ($(feature_dump_changed),1)
207 $(shell rm -f $(FEATURE_DUMP_FILENAME))
208 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
211 feature_display_check = $(eval $(feature_check_display_code))
212 define feature_check_display_code
213 ifneq ($(feature-$(1)), 1)
218 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
225 ifeq ($(feature_display),1)
227 $(info Auto-detecting system features:)
228 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
229 ifneq ($(feature_verbose),1)
234 ifeq ($(feature_verbose),1)
235 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
236 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))