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 := \
37 get_current_dir_name \
46 libelf-getshdrstrndx \
48 numa_num_possible_cpus \
52 libslang-include-subdir \
57 pthread-attr-setaffinity-np \
72 disassembler-four-args \
73 disassembler-init-styled \
76 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
77 # of all feature tests
78 FEATURE_TESTS_EXTRA := \
95 libunwind-debug-frame \
96 libunwind-debug-frame-arm \
97 libunwind-debug-frame-aarch64 \
103 libbpf-btf__load_from_kernel_by_id \
104 libbpf-bpf_prog_load \
105 libbpf-bpf_object__next_program \
106 libbpf-bpf_object__next_map \
107 libbpf-bpf_program__set_insns \
108 libbpf-bpf_create_map \
114 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
116 ifeq ($(FEATURE_TESTS),all)
117 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
129 numa_num_possible_cpus \
143 # Declare group members of a feature to display the logical OR of the detection
144 # result instead of each member result.
146 FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
148 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
149 # If in the future we need per-feature checks/flags for features not
150 # mentioned in this list we need to refactor this ;-).
151 set_test_all_flags = $(eval $(set_test_all_flags_code))
152 define set_test_all_flags_code
153 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
154 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
157 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
160 # Special fast-path for the 'all features are available' case:
162 $(call feature_check,all,$(MSG))
165 # Just in case the build freshly failed, make sure we print the
168 ifeq ($(feature-all), 1)
170 # test-all.c passed - just set all the core feature flags to 1:
172 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
174 # test-all.c does not comprise these tests, so we need to
175 # for this case to get features proper values
177 $(call feature_check,compile-32)
178 $(call feature_check,compile-x32)
179 $(call feature_check,bionic)
180 $(call feature_check,libbabeltrace)
182 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
186 # Print the result of the feature test:
188 feature_print_status = $(eval $(feature_print_status_code))
190 feature_group = $(eval $(feature_gen_group)) $(GROUP)
192 define feature_gen_group
194 ifneq ($(feature_verbose),1)
195 GROUP += $(FEATURE_GROUP_MEMBERS-$(1))
199 define feature_print_status_code
200 ifneq (,$(filter 1,$(foreach feat,$(call feature_group,$(feat)),$(feature-$(feat)))))
201 MSG = $(shell printf '...%40s: [ \033[32mon\033[m ]' $(1))
203 MSG = $(shell printf '...%40s: [ \033[31mOFF\033[m ]' $(1))
207 feature_print_text = $(eval $(feature_print_text_code))
208 define feature_print_text_code
209 MSG = $(shell printf '...%40s: %s' $(1) $(2))
213 # generates feature value assignment for name, like:
214 # $(call feature_assign,dwarf) == feature-dwarf=1
216 feature_assign = feature-$(1)=$(feature-$(1))
218 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
219 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
221 feature_dump_check = $(eval $(feature_dump_check_code))
222 define feature_dump_check_code
223 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
229 # First check if any test from FEATURE_DISPLAY
230 # and set feature_display := 1 if it does
231 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
234 # Now also check if any other test changed,
235 # so we force FEATURE-DUMP generation
236 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
238 # The $(feature_display) controls the default detection message
239 # output. It's set if:
240 # - detected features differes from stored features from
241 # last build (in $(FEATURE_DUMP_FILENAME) file)
242 # - one of the $(FEATURE_DISPLAY) is not detected
245 ifeq ($(feature_dump_changed),1)
246 $(shell rm -f $(FEATURE_DUMP_FILENAME))
247 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
250 feature_display_check = $(eval $(feature_check_display_code))
251 define feature_check_display_code
252 ifneq ($(feature-$(1)), 1)
257 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
264 ifneq ($(feature_verbose),1)
266 # Determine the features to omit from the displayed message, as only the
267 # logical OR of the detection result will be shown.
269 FEATURE_OMIT := $(foreach feat,$(FEATURE_DISPLAY),$(FEATURE_GROUP_MEMBERS-$(feat)))
272 feature_display_entries = $(eval $(feature_display_entries_code))
273 define feature_display_entries_code
274 ifeq ($(feature_display),1)
276 $$(info Auto-detecting system features:)
277 $(foreach feat,$(filter-out $(FEATURE_OMIT),$(FEATURE_DISPLAY)),$(call feature_print_status,$(feat),) $$(info $(MSG)))
280 ifeq ($(feature_verbose),1)
281 $(eval TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)))
282 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),) $$(info $(MSG)))
286 ifeq ($(FEATURE_DISPLAY_DEFERRED),)
287 $(call feature_display_entries)