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) 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 sync-compare-and-swap \
38 get_current_dir_name \
47 libelf-getshdrstrndx \
50 numa_num_possible_cpus \
57 pthread-attr-setaffinity-np \
72 disassembler-four-args
74 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
75 # of all feature tests
76 FEATURE_TESTS_EXTRA := \
90 libunwind-debug-frame \
91 libunwind-debug-frame-arm \
92 libunwind-debug-frame-aarch64 \
98 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
100 ifeq ($(FEATURE_TESTS),all)
101 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
113 numa_num_possible_cpus \
126 disassembler-four-args
128 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
129 # If in the future we need per-feature checks/flags for features not
130 # mentioned in this list we need to refactor this ;-).
131 set_test_all_flags = $(eval $(set_test_all_flags_code))
132 define set_test_all_flags_code
133 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
134 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
137 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
140 # Special fast-path for the 'all features are available' case:
142 $(call feature_check,all,$(MSG))
145 # Just in case the build freshly failed, make sure we print the
148 ifeq ($(feature-all), 1)
150 # test-all.c passed - just set all the core feature flags to 1:
152 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
154 # test-all.c does not comprise these tests, so we need to
155 # for this case to get features proper values
157 $(call feature_check,compile-32)
158 $(call feature_check,compile-x32)
159 $(call feature_check,bionic)
160 $(call feature_check,libbabeltrace)
162 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
166 # Print the result of the feature test:
168 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
170 define feature_print_status_code
171 ifeq ($(feature-$(1)), 1)
172 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
174 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
178 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
179 define feature_print_text_code
180 MSG = $(shell printf '...%30s: %s' $(1) $(2))
184 # generates feature value assignment for name, like:
185 # $(call feature_assign,dwarf) == feature-dwarf=1
187 feature_assign = feature-$(1)=$(feature-$(1))
189 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
190 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
192 feature_dump_check = $(eval $(feature_dump_check_code))
193 define feature_dump_check_code
194 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
200 # First check if any test from FEATURE_DISPLAY
201 # and set feature_display := 1 if it does
202 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
205 # Now also check if any other test changed,
206 # so we force FEATURE-DUMP generation
207 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
209 # The $(feature_display) controls the default detection message
210 # output. It's set if:
211 # - detected features differes from stored features from
212 # last build (in $(FEATURE_DUMP_FILENAME) file)
213 # - one of the $(FEATURE_DISPLAY) is not detected
216 ifeq ($(feature_dump_changed),1)
217 $(shell rm -f $(FEATURE_DUMP_FILENAME))
218 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
221 feature_display_check = $(eval $(feature_check_display_code))
222 define feature_check_display_code
223 ifneq ($(feature-$(1)), 1)
228 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
235 ifeq ($(feature_display),1)
237 $(info Auto-detecting system features:)
238 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
239 ifneq ($(feature_verbose),1)
244 ifeq ($(feature_verbose),1)
245 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
246 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))