1feature_dir := $(srctree)/tools/build/feature
  2
  3ifneq ($(OUTPUT),)
  4  OUTPUT_FEATURES = $(OUTPUT)feature/
  5  $(shell mkdir -p $(OUTPUT_FEATURES))
  6endif
  7
  8feature_check = $(eval $(feature_check_code))
  9define feature_check_code
 10  feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C $(feature_dir) $(OUTPUT_FEATURES)test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0)
 11endef
 12
 13feature_set = $(eval $(feature_set_code))
 14define feature_set_code
 15  feature-$(1) := 1
 16endef
 17
 18#
 19# Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
 20#
 21
 22#
 23# Note that this is not a complete list of all feature tests, just
 24# those that are typically built on a fully configured system.
 25#
 26# [ Feature tests not mentioned here have to be built explicitly in
 27#   the rule that uses them - an example for that is the 'bionic'
 28#   feature check. ]
 29#
 30FEATURE_TESTS_BASIC :=			\
 31	backtrace			\
 32	dwarf				\
 33	dwarf_getlocations		\
 34	fortify-source			\
 35	sync-compare-and-swap		\
 36	glibc				\
 37	gtk2				\
 38	gtk2-infobar			\
 39	libaudit			\
 40	libbfd				\
 41	libelf				\
 42	libelf-getphdrnum		\
 43	libelf-mmap			\
 44	libnuma				\
 45	numa_num_possible_cpus		\
 46	libperl				\
 47	libpython			\
 48	libpython-version		\
 49	libslang			\
 50	libcrypto			\
 51	libunwind			\
 52	pthread-attr-setaffinity-np	\
 53	stackprotector-all		\
 54	timerfd				\
 55	libdw-dwarf-unwind		\
 56	zlib				\
 57	lzma				\
 58	get_cpuid			\
 59	bpf
 60
 61# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
 62# of all feature tests
 63FEATURE_TESTS_EXTRA :=			\
 64	bionic				\
 65	compile-32			\
 66	compile-x32			\
 67	cplus-demangle			\
 68	hello				\
 69	libbabeltrace			\
 70	liberty				\
 71	liberty-z			\
 72	libunwind-debug-frame
 73
 74FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
 75
 76ifeq ($(FEATURE_TESTS),all)
 77  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
 78endif
 79
 80FEATURE_DISPLAY ?=			\
 81	dwarf				\
 82	dwarf_getlocations		\
 83	glibc				\
 84	gtk2				\
 85	libaudit			\
 86	libbfd				\
 87	libelf				\
 88	libnuma				\
 89	numa_num_possible_cpus		\
 90	libperl				\
 91	libpython			\
 92	libslang			\
 93	libcrypto			\
 94	libunwind			\
 95	libdw-dwarf-unwind		\
 96	zlib				\
 97	lzma				\
 98	get_cpuid			\
 99	bpf
100
101# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
102# If in the future we need per-feature checks/flags for features not
103# mentioned in this list we need to refactor this ;-).
104set_test_all_flags = $(eval $(set_test_all_flags_code))
105define set_test_all_flags_code
106  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
107  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
108endef
109
110$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
111
112#
113# Special fast-path for the 'all features are available' case:
114#
115$(call feature_check,all,$(MSG))
116
117#
118# Just in case the build freshly failed, make sure we print the
119# feature matrix:
120#
121ifeq ($(feature-all), 1)
122  #
123  # test-all.c passed - just set all the core feature flags to 1:
124  #
125  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
126  #
127  # test-all.c does not comprise these tests, so we need to
128  # for this case to get features proper values
129  #
130  $(call feature_check,compile-32)
131  $(call feature_check,compile-x32)
132  $(call feature_check,bionic)
133  $(call feature_check,libbabeltrace)
134else
135  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
136endif
137
138#
139# Print the result of the feature test:
140#
141feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
142
143define feature_print_status_code
144  ifeq ($(feature-$(1)), 1)
145    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
146  else
147    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
148  endif
149endef
150
151feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
152define feature_print_text_code
153    MSG = $(shell printf '...%30s: %s' $(1) $(2))
154endef
155
156#
157# generates feature value assignment for name, like:
158#   $(call feature_assign,dwarf) == feature-dwarf=1
159#
160feature_assign = feature-$(1)=$(feature-$(1))
161
162FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
163FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
164
165feature_dump_check = $(eval $(feature_dump_check_code))
166define feature_dump_check_code
167  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
168    $(2) := 1
169  endif
170endef
171
172#
173# First check if any test from FEATURE_DISPLAY
174# and set feature_display := 1 if it does
175$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
176
177#
178# Now also check if any other test changed,
179# so we force FEATURE-DUMP generation
180$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
181
182# The $(feature_display) controls the default detection message
183# output. It's set if:
184# - detected features differes from stored features from
185#   last build (in $(FEATURE_DUMP_FILENAME) file)
186# - one of the $(FEATURE_DISPLAY) is not detected
187# - VF is enabled
188
189ifeq ($(feature_dump_changed),1)
190  $(shell rm -f $(FEATURE_DUMP_FILENAME))
191  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
192endif
193
194feature_display_check = $(eval $(feature_check_display_code))
195define feature_check_display_code
196  ifneq ($(feature-$(1)), 1)
197    feature_display := 1
198  endif
199endef
200
201$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
202
203ifeq ($(VF),1)
204  feature_display := 1
205  feature_verbose := 1
206endif
207
208ifeq ($(feature_display),1)
209  $(info )
210  $(info Auto-detecting system features:)
211  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
212  ifneq ($(feature_verbose),1)
213    $(info )
214  endif
215endif
216
217ifeq ($(feature_verbose),1)
218  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
219  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
220  $(info )
221endif