1 # SPDX-License-Identifier: GPL-2.0-only
2 feature_dir := $(srctree)/tools/build/feature
5 OUTPUT_FEATURES = $(OUTPUT)feature/
6 $(shell mkdir -p $(OUTPUT_FEATURES))
9 feature_check = $(eval $(feature_check_code))
10 define feature_check_code
11 feature-$(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)
14 feature_set = $(eval $(feature_set_code))
15 define feature_set_code
20 # Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
24 # Note that this is not a complete list of all feature tests, just
25 # those that are typically built on a fully configured system.
27 # [ Feature tests not mentioned here have to be built explicitly in
28 # the rule that uses them - an example for that is the 'bionic'
31 FEATURE_TESTS_BASIC := \
38 get_current_dir_name \
47 libelf-getshdrstrndx \
49 numa_num_possible_cpus \
53 libslang-include-subdir \
58 pthread-attr-setaffinity-np \
74 disassembler-four-args \
75 disassembler-init-styled \
78 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
79 # of all feature tests
80 FEATURE_TESTS_EXTRA := \
97 libunwind-debug-frame \
98 libunwind-debug-frame-arm \
99 libunwind-debug-frame-aarch64 \
105 libbpf-btf__load_from_kernel_by_id \
106 libbpf-bpf_prog_load \
107 libbpf-bpf_object__next_program \
108 libbpf-bpf_object__next_map \
109 libbpf-bpf_program__set_insns \
110 libbpf-bpf_create_map \
116 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
118 ifeq ($(FEATURE_TESTS),all)
119 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
131 numa_num_possible_cpus \
145 # Declare group members of a feature to display the logical OR of the detection
146 # result instead of each member result.
148 FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
150 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
151 # If in the future we need per-feature checks/flags for features not
152 # mentioned in this list we need to refactor this ;-).
153 set_test_all_flags = $(eval $(set_test_all_flags_code))
154 define set_test_all_flags_code
155 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
156 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
159 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
162 # Special fast-path for the 'all features are available' case:
164 $(call feature_check,all,$(MSG))
167 # Just in case the build freshly failed, make sure we print the
170 ifeq ($(feature-all), 1)
172 # test-all.c passed - just set all the core feature flags to 1:
174 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
176 # test-all.c does not comprise these tests, so we need to
177 # for this case to get features proper values
179 $(call feature_check,compile-32)
180 $(call feature_check,compile-x32)
181 $(call feature_check,bionic)
182 $(call feature_check,libbabeltrace)
184 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
188 # Print the result of the feature test:
190 feature_print_status = $(eval $(feature_print_status_code))
192 feature_group = $(eval $(feature_gen_group)) $(GROUP)
194 define feature_gen_group
196 ifneq ($(feature_verbose),1)
197 GROUP += $(FEATURE_GROUP_MEMBERS-$(1))
201 define feature_print_status_code
202 ifneq (,$(filter 1,$(foreach feat,$(call feature_group,$(feat)),$(feature-$(feat)))))
203 MSG = $(shell printf '...%40s: [ \033[32mon\033[m ]' $(1))
205 MSG = $(shell printf '...%40s: [ \033[31mOFF\033[m ]' $(1))
209 feature_print_text = $(eval $(feature_print_text_code))
210 define feature_print_text_code
211 MSG = $(shell printf '...%40s: %s' $(1) $(2))
215 # generates feature value assignment for name, like:
216 # $(call feature_assign,dwarf) == feature-dwarf=1
218 feature_assign = feature-$(1)=$(feature-$(1))
220 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
221 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
223 feature_dump_check = $(eval $(feature_dump_check_code))
224 define feature_dump_check_code
225 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
231 # First check if any test from FEATURE_DISPLAY
232 # and set feature_display := 1 if it does
233 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
236 # Now also check if any other test changed,
237 # so we force FEATURE-DUMP generation
238 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
240 # The $(feature_display) controls the default detection message
241 # output. It's set if:
242 # - detected features differes from stored features from
243 # last build (in $(FEATURE_DUMP_FILENAME) file)
244 # - one of the $(FEATURE_DISPLAY) is not detected
247 ifeq ($(feature_dump_changed),1)
248 $(shell rm -f $(FEATURE_DUMP_FILENAME))
249 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
252 feature_display_check = $(eval $(feature_check_display_code))
253 define feature_check_display_code
254 ifneq ($(feature-$(1)), 1)
259 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
266 ifneq ($(feature_verbose),1)
268 # Determine the features to omit from the displayed message, as only the
269 # logical OR of the detection result will be shown.
271 FEATURE_OMIT := $(foreach feat,$(FEATURE_DISPLAY),$(FEATURE_GROUP_MEMBERS-$(feat)))
274 feature_display_entries = $(eval $(feature_display_entries_code))
275 define feature_display_entries_code
276 ifeq ($(feature_display),1)
278 $$(info Auto-detecting system features:)
279 $(foreach feat,$(filter-out $(FEATURE_OMIT),$(FEATURE_DISPLAY)),$(call feature_print_status,$(feat),) $$(info $(MSG)))
282 ifeq ($(feature_verbose),1)
283 $(eval TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)))
284 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),) $$(info $(MSG)))
288 ifeq ($(FEATURE_DISPLAY_DEFERRED),)
289 $(call feature_display_entries)