tools/build/Makefile.feature

   1 feature_dir := $(srctree)/tools/build/feature
   2
   3 ifneq ($(OUTPUT),)
   4   OUTPUT_FEATURES = $(OUTPUT)feature/
   5   $(shell mkdir -p $(OUTPUT_FEATURES))
   6 endif
   7
   8 feature_check = $(eval $(feature_check_code))
   9 define feature_check_code
  10   feature-$(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)
  11 endef
  12
  13 feature_set = $(eval $(feature_set_code))
  14 define feature_set_code
  15   feature-$(1) := 1
  16 endef
  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 #
  30 FEATURE_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
  59 FEATURE_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 ;-).
  81 set_test_all_flags = $(eval $(set_test_all_flags_code))
  82 define set_test_all_flags_code
  83   FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
  84   FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
  85 endef
  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 #
  98 ifeq ($(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)))
 103 else
 104   $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
 105 endif
 106
 107 #
 108 # Print the result of the feature test:
 109 #
 110 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
 111
 112 define feature_print_status_code
 113   ifeq ($(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
 118 endef
 119
 120 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
 121 define feature_print_text_code
 122     MSG = $(shell printf '...%30s: %s' $(1) $(2))
 123 endef
 124
 125 #
 126 # generates feature value assignment for name, like:
 127 #   $(call feature_assign,dwarf) == feature-dwarf=1
 128 #
 129 feature_assign = feature-$(1)=$(feature-$(1))
 130
 131 FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
 132 FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
 133
 134 feature_dump_check = $(eval $(feature_dump_check_code))
 135 define feature_dump_check_code
 136   ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
 137     $(2) := 1
 138   endif
 139 endef
 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 $(FEATURE_DISPLAY) is not detected
 156 # - VF is enabled
 157
 158 ifeq ($(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)))
 161 endif
 162
 163 feature_display_check = $(eval $(feature_check_display_code))
 164 define feature_check_display_code
 165   ifneq ($(feature-$(1)), 1)
 166     feature_display := 1
 167   endif
 168 endef
 169
 170 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
 171
 172 ifeq ($(VF),1)
 173   feature_display := 1
 174   feature_verbose := 1
 175 endif
 176
 177 ifeq ($(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     $(info )
 183   endif
 184 endif
 185
 186 ifeq ($(feature_verbose),1)
 187   TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
 188   $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
 189   $(info )
 190 endif