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 \
75 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
76 # of all feature tests
77 FEATURE_TESTS_EXTRA := \
93 libunwind-debug-frame \
94 libunwind-debug-frame-arm \
95 libunwind-debug-frame-aarch64 \
101 libbpf-btf__load_from_kernel_by_id \
102 libbpf-bpf_prog_load \
103 libbpf-bpf_object__next_program \
104 libbpf-bpf_object__next_map \
105 libbpf-bpf_create_map \
111 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
113 ifeq ($(FEATURE_TESTS),all)
114 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
126 numa_num_possible_cpus \
138 disassembler-four-args
140 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
141 # If in the future we need per-feature checks/flags for features not
142 # mentioned in this list we need to refactor this ;-).
143 set_test_all_flags = $(eval $(set_test_all_flags_code))
144 define set_test_all_flags_code
145 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
146 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
149 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
152 # Special fast-path for the 'all features are available' case:
154 $(call feature_check,all,$(MSG))
157 # Just in case the build freshly failed, make sure we print the
160 ifeq ($(feature-all), 1)
162 # test-all.c passed - just set all the core feature flags to 1:
164 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
166 # test-all.c does not comprise these tests, so we need to
167 # for this case to get features proper values
169 $(call feature_check,compile-32)
170 $(call feature_check,compile-x32)
171 $(call feature_check,bionic)
172 $(call feature_check,libbabeltrace)
174 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
178 # Print the result of the feature test:
180 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
182 define feature_print_status_code
183 ifeq ($(feature-$(1)), 1)
184 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
186 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
190 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
191 define feature_print_text_code
192 MSG = $(shell printf '...%30s: %s' $(1) $(2))
196 # generates feature value assignment for name, like:
197 # $(call feature_assign,dwarf) == feature-dwarf=1
199 feature_assign = feature-$(1)=$(feature-$(1))
201 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
202 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
204 feature_dump_check = $(eval $(feature_dump_check_code))
205 define feature_dump_check_code
206 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
212 # First check if any test from FEATURE_DISPLAY
213 # and set feature_display := 1 if it does
214 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
217 # Now also check if any other test changed,
218 # so we force FEATURE-DUMP generation
219 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
221 # The $(feature_display) controls the default detection message
222 # output. It's set if:
223 # - detected features differes from stored features from
224 # last build (in $(FEATURE_DUMP_FILENAME) file)
225 # - one of the $(FEATURE_DISPLAY) is not detected
228 ifeq ($(feature_dump_changed),1)
229 $(shell rm -f $(FEATURE_DUMP_FILENAME))
230 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
233 feature_display_check = $(eval $(feature_check_display_code))
234 define feature_check_display_code
235 ifneq ($(feature-$(1)), 1)
240 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
247 feature_display_entries = $(eval $(feature_display_entries_code))
248 define feature_display_entries_code
249 ifeq ($(feature_display),1)
251 $(info Auto-detecting system features:)
252 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
253 ifneq ($(feature_verbose),1)
258 ifeq ($(feature_verbose),1)
259 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
260 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
265 ifeq ($(FEATURE_DISPLAY_DEFERRED),)
266 $(call feature_display_entries)