kernel/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) 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         libperl                         \
  45         libpython                       \
  46         libpython-version               \
  47         libslang                        \
  48         libunwind                       \
  49         pthread-attr-setaffinity-np     \
  50         stackprotector-all              \
  51         timerfd                         \
  52         libdw-dwarf-unwind              \
  53         zlib                            \
  54         lzma
  55
  56 FEATURE_DISPLAY =                       \
  57         dwarf                           \
  58         glibc                           \
  59         gtk2                            \
  60         libaudit                        \
  61         libbfd                          \
  62         libelf                          \
  63         libnuma                         \
  64         libperl                         \
  65         libpython                       \
  66         libslang                        \
  67         libunwind                       \
  68         libdw-dwarf-unwind              \
  69         zlib                            \
  70         lzma
  71
  72 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
  73 # If in the future we need per-feature checks/flags for features not
  74 # mentioned in this list we need to refactor this ;-).
  75 set_test_all_flags = $(eval $(set_test_all_flags_code))
  76 define set_test_all_flags_code
  77   FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
  78   FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
  79 endef
  80
  81 $(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
  82
  83 #
  84 # Special fast-path for the 'all features are available' case:
  85 #
  86 $(call feature_check,all,$(MSG))
  87
  88 #
  89 # Just in case the build freshly failed, make sure we print the
  90 # feature matrix:
  91 #
  92 ifeq ($(feature-all), 1)
  93   #
  94   # test-all.c passed - just set all the core feature flags to 1:
  95   #
  96   $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
  97 else
  98   $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS)" LDFLAGS=$(LDFLAGS) -i -j -C $(feature_dir) $(addsuffix .bin,$(FEATURE_TESTS)) >/dev/null 2>&1)
  99   $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
 100 endif
 101
 102 #
 103 # Print the result of the feature test:
 104 #
 105 feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
 106
 107 define feature_print_status_code
 108   ifeq ($(feature-$(1)), 1)
 109     MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
 110   else
 111     MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
 112   endif
 113 endef
 114
 115 feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
 116 define feature_print_text_code
 117     MSG = $(shell printf '...%30s: %s' $(1) $(2))
 118 endef
 119
 120 FEATURE_DUMP := $(foreach feat,$(FEATURE_DISPLAY),feature-$(feat)($(feature-$(feat))))
 121 FEATURE_DUMP_FILE := $(shell touch $(OUTPUT)FEATURE-DUMP; cat $(OUTPUT)FEATURE-DUMP)
 122
 123 ifeq ($(dwarf-post-unwind),1)
 124   FEATURE_DUMP += dwarf-post-unwind($(dwarf-post-unwind-text))
 125 endif
 126
 127 # The $(feature_display) controls the default detection message
 128 # output. It's set if:
 129 # - detected features differes from stored features from
 130 #   last build (in FEATURE-DUMP file)
 131 # - one of the $(FEATURE_DISPLAY) is not detected
 132 # - VF is enabled
 133
 134 ifneq ("$(FEATURE_DUMP)","$(FEATURE_DUMP_FILE)")
 135   $(shell echo "$(FEATURE_DUMP)" > $(OUTPUT)FEATURE-DUMP)
 136   feature_display := 1
 137 endif
 138
 139 feature_display_check = $(eval $(feature_check_code))
 140 define feature_display_check_code
 141   ifneq ($(feature-$(1)), 1)
 142     feature_display := 1
 143   endif
 144 endef
 145
 146 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
 147
 148 ifeq ($(VF),1)
 149   feature_display := 1
 150   feature_verbose := 1
 151 endif
 152
 153 ifeq ($(feature_display),1)
 154   $(info )
 155   $(info Auto-detecting system features:)
 156   $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
 157
 158   ifeq ($(dwarf-post-unwind),1)
 159     $(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
 160   endif
 161
 162   ifneq ($(feature_verbose),1)
 163     $(info )
 164   endif
 165 endif
 166
 167 ifeq ($(feature_verbose),1)
 168   TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
 169   $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
 170   $(info )
 171 endif