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 \
48 libelf-getshdrstrndx \
51 numa_num_possible_cpus \
56 libslang-include-subdir \
59 pthread-attr-setaffinity-np \
74 disassembler-four-args
76 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
77 # of all feature tests
78 FEATURE_TESTS_EXTRA := \
92 libunwind-debug-frame \
93 libunwind-debug-frame-arm \
94 libunwind-debug-frame-aarch64 \
100 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
102 ifeq ($(FEATURE_TESTS),all)
103 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
115 numa_num_possible_cpus \
127 disassembler-four-args
129 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
130 # If in the future we need per-feature checks/flags for features not
131 # mentioned in this list we need to refactor this ;-).
132 set_test_all_flags = $(eval $(set_test_all_flags_code))
133 define set_test_all_flags_code
134 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
135 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
138 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
141 # Special fast-path for the 'all features are available' case:
143 $(call feature_check,all,$(MSG))
146 # Just in case the build freshly failed, make sure we print the
149 ifeq ($(feature-all), 1)
151 # test-all.c passed - just set all the core feature flags to 1:
153 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
155 # test-all.c does not comprise these tests, so we need to
156 # for this case to get features proper values
158 $(call feature_check,compile-32)
159 $(call feature_check,compile-x32)
160 $(call feature_check,bionic)
161 $(call feature_check,libbabeltrace)
163 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
167 # Print the result of the feature test:
169 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
171 define feature_print_status_code
172 ifeq ($(feature-$(1)), 1)
173 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
175 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
179 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
180 define feature_print_text_code
181 MSG = $(shell printf '...%30s: %s' $(1) $(2))
185 # generates feature value assignment for name, like:
186 # $(call feature_assign,dwarf) == feature-dwarf=1
188 feature_assign = feature-$(1)=$(feature-$(1))
190 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
191 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
193 feature_dump_check = $(eval $(feature_dump_check_code))
194 define feature_dump_check_code
195 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
201 # First check if any test from FEATURE_DISPLAY
202 # and set feature_display := 1 if it does
203 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
206 # Now also check if any other test changed,
207 # so we force FEATURE-DUMP generation
208 $(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
210 # The $(feature_display) controls the default detection message
211 # output. It's set if:
212 # - detected features differes from stored features from
213 # last build (in $(FEATURE_DUMP_FILENAME) file)
214 # - one of the $(FEATURE_DISPLAY) is not detected
217 ifeq ($(feature_dump_changed),1)
218 $(shell rm -f $(FEATURE_DUMP_FILENAME))
219 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
222 feature_display_check = $(eval $(feature_check_display_code))
223 define feature_check_display_code
224 ifneq ($(feature-$(1)), 1)
229 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
236 ifeq ($(feature_display),1)
238 $(info Auto-detecting system features:)
239 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
240 ifneq ($(feature_verbose),1)
245 ifeq ($(feature_verbose),1)
246 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
247 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))