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 ?= \ 31 backtrace \ 32 dwarf \ 33 fortify-source \ 34 sync-compare-and-swap \ 35 glibc \ 36 gtk2 \ 37 gtk2-infobar \ 38 libaudit \ 39 libbfd \ 40 libelf \ 41 libelf-getphdrnum \ 42 libelf-mmap \ 43 libnuma \ 44 numa_num_possible_cpus \ 45 libperl \ 46 libpython \ 47 libpython-version \ 48 libslang \ 49 libunwind \ 50 pthread-attr-setaffinity-np \ 51 stackprotector-all \ 52 timerfd \ 53 libdw-dwarf-unwind \ 54 zlib \ 55 lzma \ 56 get_cpuid \ 57 bpf 58 59FEATURE_DISPLAY ?= \ 60 dwarf \ 61 glibc \ 62 gtk2 \ 63 libaudit \ 64 libbfd \ 65 libelf \ 66 libnuma \ 67 numa_num_possible_cpus \ 68 libperl \ 69 libpython \ 70 libslang \ 71 libunwind \ 72 libdw-dwarf-unwind \ 73 zlib \ 74 lzma \ 75 get_cpuid \ 76 bpf 77 78# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features. 79# If in the future we need per-feature checks/flags for features not 80# mentioned in this list we need to refactor this ;-). 81set_test_all_flags = $(eval $(set_test_all_flags_code)) 82define set_test_all_flags_code 83 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1)) 84 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1)) 85endef 86 87$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat))) 88 89# 90# Special fast-path for the 'all features are available' case: 91# 92$(call feature_check,all,$(MSG)) 93 94# 95# Just in case the build freshly failed, make sure we print the 96# feature matrix: 97# 98ifeq ($(feature-all), 1) 99 # 100 # test-all.c passed - just set all the core feature flags to 1: 101 # 102 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat))) 103else 104 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat))) 105endif 106 107# 108# Print the result of the feature test: 109# 110feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG)) 111 112define feature_print_status_code 113 ifeq ($(feature-$(1)), 1) 114 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1)) 115 else 116 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1)) 117 endif 118endef 119 120feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG)) 121define feature_print_text_code 122 MSG = $(shell printf '...%30s: %s' $(1) $(2)) 123endef 124 125# 126# generates feature value assignment for name, like: 127# $(call feature_assign,dwarf) == feature-dwarf=1 128# 129feature_assign = feature-$(1)=$(feature-$(1)) 130 131FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER) 132FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME)) 133 134feature_dump_check = $(eval $(feature_dump_check_code)) 135define feature_dump_check_code 136 ifeq ($(findstring $(1),$(FEATURE_DUMP)),) 137 $(2) := 1 138 endif 139endef 140 141# 142# First check if any test from FEATURE_DISPLAY 143# and set feature_display := 1 if it does 144$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display)) 145 146# 147# Now also check if any other test changed, 148# so we force FEATURE-DUMP generation 149$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed)) 150 151# The $(feature_display) controls the default detection message 152# output. It's set if: 153# - detected features differes from stored features from 154# last build (in $(FEATURE_DUMP_FILENAME) file) 155# - one of the $(FEATURE_DISPLAY) is not detected 156# - VF is enabled 157 158ifeq ($(feature_dump_changed),1) 159 $(shell rm -f $(FEATURE_DUMP_FILENAME)) 160 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME))) 161endif 162 163feature_display_check = $(eval $(feature_check_display_code)) 164define feature_check_display_code 165 ifneq ($(feature-$(1)), 1) 166 feature_display := 1 167 endif 168endef 169 170$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat))) 171 172ifeq ($(VF),1) 173 feature_display := 1 174 feature_verbose := 1 175endif 176 177ifeq ($(feature_display),1) 178 $(info ) 179 $(info Auto-detecting system features:) 180 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),)) 181 ifneq ($(feature_verbose),1) 182 $(info ) 183 endif 184endif 185 186ifeq ($(feature_verbose),1) 187 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)) 188 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),)) 189 $(info ) 190endif 191