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 222