LXR linux/tools/build/Makefile.feature

   1# SPDX-License-Identifier: GPL-2.0-only
   2feature_dir := $(srctree)/tools/build/feature
   3
   4ifneq ($(OUTPUT),)
   5  OUTPUT_FEATURES = $(OUTPUT)feature/
   6  $(shell mkdir -p $(OUTPUT_FEATURES))
   7endif
   8
   9feature_check = $(eval $(feature_check_code))
  10define feature_check_code
  11  feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" CXXFLAGS="$(EXTRA_CXXFLAGS) $(FEATURE_CHECK_CXXFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C $(feature_dir) $(OUTPUT_FEATURES)test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0)
  12endef
  13
  14feature_set = $(eval $(feature_set_code))
  15define feature_set_code
  16  feature-$(1) := 1
  17endef
  18
  19#
  20# Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
  21#
  22
  23#
  24# Note that this is not a complete list of all feature tests, just
  25# those that are typically built on a fully configured system.
  26#
  27# [ Feature tests not mentioned here have to be built explicitly in
  28#   the rule that uses them - an example for that is the 'bionic'
  29#   feature check. ]
  30#
  31FEATURE_TESTS_BASIC :=                  \
  32        backtrace                       \
  33        dwarf                           \
  34        dwarf_getlocations              \
  35        eventfd                         \
  36        fortify-source                  \
  37        sync-compare-and-swap           \
  38        get_current_dir_name            \
  39        gettid                          \
  40        glibc                           \
  41        gtk2                            \
  42        gtk2-infobar                    \
  43        libaudit                        \
  44        libbfd                          \
  45        libcap                          \
  46        libelf                          \
  47        libelf-getphdrnum               \
  48        libelf-gelf_getnote             \
  49        libelf-getshdrstrndx            \
  50        libelf-mmap                     \
  51        libnuma                         \
  52        numa_num_possible_cpus          \
  53        libperl                         \
  54        libpython                       \
  55        libpython-version               \
  56        libslang                        \
  57        libslang-include-subdir         \
  58        libcrypto                       \
  59        libunwind                       \
  60        pthread-attr-setaffinity-np     \
  61        pthread-barrier                 \
  62        reallocarray                    \
  63        stackprotector-all              \
  64        timerfd                         \
  65        libdw-dwarf-unwind              \
  66        zlib                            \
  67        lzma                            \
  68        get_cpuid                       \
  69        bpf                             \
  70        sched_getcpu                    \
  71        sdt                             \
  72        setns                           \
  73        libaio                          \
  74        libzstd                         \
  75        disassembler-four-args          \
  76        file-handle
  77
  78# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
  79# of all feature tests
  80FEATURE_TESTS_EXTRA :=                  \
  81         bionic                         \
  82         compile-32                     \
  83         compile-x32                    \
  84         cplus-demangle                 \
  85         hello                          \
  86         libbabeltrace                  \
  87         libbfd-liberty                 \
  88         libbfd-liberty-z               \
  89         libopencsd                     \
  90         libunwind-x86                  \
  91         libunwind-x86_64               \
  92         libunwind-arm                  \
  93         libunwind-aarch64              \
  94         libunwind-debug-frame          \
  95         libunwind-debug-frame-arm      \
  96         libunwind-debug-frame-aarch64  \
  97         cxx                            \
  98         llvm                           \
  99         llvm-version                   \
 100         clang                          \
 101         libbpf
 102
 103FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
 104
 105ifeq ($(FEATURE_TESTS),all)
 106  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
 107endif
 108
 109FEATURE_DISPLAY ?=              \
 110         dwarf                  \
 111         dwarf_getlocations     \
 112         glibc                  \
 113         gtk2                   \
 114         libaudit               \
 115         libbfd                 \
 116         libcap                 \
 117         libelf                 \
 118         libnuma                \
 119         numa_num_possible_cpus \
 120         libperl                \
 121         libpython              \
 122         libcrypto              \
 123         libunwind              \
 124         libdw-dwarf-unwind     \
 125         zlib                   \
 126         lzma                   \
 127         get_cpuid              \
 128         bpf                    \
 129         libaio                 \
 130         libzstd                \
 131         disassembler-four-args
 132
 133# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
 134# If in the future we need per-feature checks/flags for features not
 135# mentioned in this list we need to refactor this ;-).
 136set_test_all_flags = $(eval $(set_test_all_flags_code))
 137define set_test_all_flags_code
 138  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
 139  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
 140endef
 141
 142$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
 143
 144#
 145# Special fast-path for the 'all features are available' case:
 146#
 147$(call feature_check,all,$(MSG))
 148
 149#
 150# Just in case the build freshly failed, make sure we print the
 151# feature matrix:
 152#
 153ifeq ($(feature-all), 1)
 154  #
 155  # test-all.c passed - just set all the core feature flags to 1:
 156  #
 157  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
 158  #
 159  # test-all.c does not comprise these tests, so we need to
 160  # for this case to get features proper values
 161  #
 162  $(call feature_check,compile-32)
 163  $(call feature_check,compile-x32)
 164  $(call feature_check,bionic)
 165  $(call feature_check,libbabeltrace)
 166else
 167  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
 168endif
 169
 170#
 171# Print the result of the feature test:
 172#
 173feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
 174
 175define feature_print_status_code
 176  ifeq ($(feature-$(1)), 1)
 177    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
 178  else
 179    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
 180  endif
 181endef
 182
 183feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
 184define feature_print_text_code
 185    MSG = $(shell printf '...%30s: %s' $(1) $(2))
 186endef
 187
 188#
 189# generates feature value assignment for name, like:
 190#   $(call feature_assign,dwarf) == feature-dwarf=1
 191#
 192feature_assign = feature-$(1)=$(feature-$(1))
 193
 194FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
 195FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
 196
 197feature_dump_check = $(eval $(feature_dump_check_code))
 198define feature_dump_check_code
 199  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
 200    $(2) := 1
 201  endif
 202endef
 203
 204#
 205# First check if any test from FEATURE_DISPLAY
 206# and set feature_display := 1 if it does
 207$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
 208
 209#
 210# Now also check if any other test changed,
 211# so we force FEATURE-DUMP generation
 212$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
 213
 214# The $(feature_display) controls the default detection message
 215# output. It's set if:
 216# - detected features differes from stored features from
 217#   last build (in $(FEATURE_DUMP_FILENAME) file)
 218# - one of the $(FEATURE_DISPLAY) is not detected
 219# - VF is enabled
 220
 221ifeq ($(feature_dump_changed),1)
 222  $(shell rm -f $(FEATURE_DUMP_FILENAME))
 223  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
 224endif
 225
 226feature_display_check = $(eval $(feature_check_display_code))
 227define feature_check_display_code
 228  ifneq ($(feature-$(1)), 1)
 229    feature_display := 1
 230  endif
 231endef
 232
 233$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
 234
 235ifeq ($(VF),1)
 236  feature_display := 1
 237  feature_verbose := 1
 238endif
 239
 240ifeq ($(feature_display),1)
 241  $(info )
 242  $(info Auto-detecting system features:)
 243  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
 244  ifneq ($(feature_verbose),1)
 245    $(info )
 246  endif
 247endif
 248
 249ifeq ($(feature_verbose),1)
 250  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
 251  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
 252  $(info )
 253endif
 254