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) 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 $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS)" LDFLAGS=$(LDFLAGS) -i -j -C $(feature_dir) $(addsuffix .bin,$(FEATURE_TESTS)) >/dev/null 2>&1) 105 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat))) 106endif 107 108# 109# Print the result of the feature test: 110# 111feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG)) 112 113define feature_print_status_code 114 ifeq ($(feature-$(1)), 1) 115 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1)) 116 else 117 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1)) 118 endif 119endef 120 121feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG)) 122define feature_print_text_code 123 MSG = $(shell printf '...%30s: %s' $(1) $(2)) 124endef 125 126FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER) 127FEATURE_DUMP := $(foreach feat,$(FEATURE_DISPLAY),feature-$(feat)($(feature-$(feat)))) 128FEATURE_DUMP_FILE := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME)) 129 130ifeq ($(dwarf-post-unwind),1) 131 FEATURE_DUMP += dwarf-post-unwind($(dwarf-post-unwind-text)) 132endif 133 134# The $(feature_display) controls the default detection message 135# output. It's set if: 136# - detected features differes from stored features from 137# last build (in $(FEATURE_DUMP_FILENAME) file) 138# - one of the $(FEATURE_DISPLAY) is not detected 139# - VF is enabled 140 141ifneq ("$(FEATURE_DUMP)","$(FEATURE_DUMP_FILE)") 142 $(shell echo "$(FEATURE_DUMP)" > $(FEATURE_DUMP_FILENAME)) 143 feature_display := 1 144endif 145 146feature_display_check = $(eval $(feature_check_display_code)) 147define feature_display_check_code 148 ifneq ($(feature-$(1)), 1) 149 feature_display := 1 150 endif 151endef 152 153$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat))) 154 155ifeq ($(VF),1) 156 feature_display := 1 157 feature_verbose := 1 158endif 159 160ifeq ($(feature_display),1) 161 $(info ) 162 $(info Auto-detecting system features:) 163 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),)) 164 165 ifeq ($(dwarf-post-unwind),1) 166 $(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text)) 167 endif 168 169 ifneq ($(feature_verbose),1) 170 $(info ) 171 endif 172endif 173 174ifeq ($(feature_verbose),1) 175 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)) 176 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),)) 177 $(info ) 178endif 179