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) CC="$(CC)" CXX="$(CXX)" 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        get_current_dir_name            \
  38        gettid                          \
  39        glibc                           \
  40        libbfd                          \
  41        libbfd-buildid                  \
  42        libcap                          \
  43        libelf                          \
  44        libelf-getphdrnum               \
  45        libelf-gelf_getnote             \
  46        libelf-getshdrstrndx            \
  47        libnuma                         \
  48        numa_num_possible_cpus          \
  49        libperl                         \
  50        libpython                       \
  51        libpython-version               \
  52        libslang                        \
  53        libslang-include-subdir         \
  54        libtraceevent                   \
  55        libcrypto                       \
  56        libunwind                       \
  57        pthread-attr-setaffinity-np     \
  58        pthread-barrier                 \
  59        reallocarray                    \
  60        stackprotector-all              \
  61        timerfd                         \
  62        libdw-dwarf-unwind              \
  63        zlib                            \
  64        lzma                            \
  65        get_cpuid                       \
  66        bpf                             \
  67        sched_getcpu                    \
  68        sdt                             \
  69        setns                           \
  70        libaio                          \
  71        libzstd                         \
  72        disassembler-four-args          \
  73        file-handle
  74
  75# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
  76# of all feature tests
  77FEATURE_TESTS_EXTRA :=                  \
  78         bionic                         \
  79         compile-32                     \
  80         compile-x32                    \
  81         cplus-demangle                 \
  82         gtk2                           \
  83         gtk2-infobar                   \
  84         hello                          \
  85         libbabeltrace                  \
  86         libbfd-liberty                 \
  87         libbfd-liberty-z               \
  88         libopencsd                     \
  89         libunwind-x86                  \
  90         libunwind-x86_64               \
  91         libunwind-arm                  \
  92         libunwind-aarch64              \
  93         libunwind-debug-frame          \
  94         libunwind-debug-frame-arm      \
  95         libunwind-debug-frame-aarch64  \
  96         cxx                            \
  97         llvm                           \
  98         llvm-version                   \
  99         clang                          \
 100         libbpf                         \
 101         libpfm4                        \
 102         libdebuginfod                  \
 103         clang-bpf-co-re
 104
 105
 106FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
 107
 108ifeq ($(FEATURE_TESTS),all)
 109  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
 110endif
 111
 112FEATURE_DISPLAY ?=              \
 113         dwarf                  \
 114         dwarf_getlocations     \
 115         glibc                  \
 116         libbfd                 \
 117         libbfd-buildid         \
 118         libcap                 \
 119         libelf                 \
 120         libnuma                \
 121         numa_num_possible_cpus \
 122         libperl                \
 123         libpython              \
 124         libcrypto              \
 125         libunwind              \
 126         libdw-dwarf-unwind     \
 127         zlib                   \
 128         lzma                   \
 129         get_cpuid              \
 130         bpf                    \
 131         libaio                 \
 132         libzstd                \
 133         disassembler-four-args
 134
 135# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
 136# If in the future we need per-feature checks/flags for features not
 137# mentioned in this list we need to refactor this ;-).
 138set_test_all_flags = $(eval $(set_test_all_flags_code))
 139define set_test_all_flags_code
 140  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
 141  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
 142endef
 143
 144$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
 145
 146#
 147# Special fast-path for the 'all features are available' case:
 148#
 149$(call feature_check,all,$(MSG))
 150
 151#
 152# Just in case the build freshly failed, make sure we print the
 153# feature matrix:
 154#
 155ifeq ($(feature-all), 1)
 156  #
 157  # test-all.c passed - just set all the core feature flags to 1:
 158  #
 159  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
 160  #
 161  # test-all.c does not comprise these tests, so we need to
 162  # for this case to get features proper values
 163  #
 164  $(call feature_check,compile-32)
 165  $(call feature_check,compile-x32)
 166  $(call feature_check,bionic)
 167  $(call feature_check,libbabeltrace)
 168else
 169  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
 170endif
 171
 172#
 173# Print the result of the feature test:
 174#
 175feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
 176
 177define feature_print_status_code
 178  ifeq ($(feature-$(1)), 1)
 179    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
 180  else
 181    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
 182  endif
 183endef
 184
 185feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
 186define feature_print_text_code
 187    MSG = $(shell printf '...%30s: %s' $(1) $(2))
 188endef
 189
 190#
 191# generates feature value assignment for name, like:
 192#   $(call feature_assign,dwarf) == feature-dwarf=1
 193#
 194feature_assign = feature-$(1)=$(feature-$(1))
 195
 196FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
 197FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
 198
 199feature_dump_check = $(eval $(feature_dump_check_code))
 200define feature_dump_check_code
 201  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
 202    $(2) := 1
 203  endif
 204endef
 205
 206#
 207# First check if any test from FEATURE_DISPLAY
 208# and set feature_display := 1 if it does
 209$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
 210
 211#
 212# Now also check if any other test changed,
 213# so we force FEATURE-DUMP generation
 214$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
 215
 216# The $(feature_display) controls the default detection message
 217# output. It's set if:
 218# - detected features differes from stored features from
 219#   last build (in $(FEATURE_DUMP_FILENAME) file)
 220# - one of the $(FEATURE_DISPLAY) is not detected
 221# - VF is enabled
 222
 223ifeq ($(feature_dump_changed),1)
 224  $(shell rm -f $(FEATURE_DUMP_FILENAME))
 225  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
 226endif
 227
 228feature_display_check = $(eval $(feature_check_display_code))
 229define feature_check_display_code
 230  ifneq ($(feature-$(1)), 1)
 231    feature_display := 1
 232  endif
 233endef
 234
 235$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
 236
 237ifeq ($(VF),1)
 238  feature_display := 1
 239  feature_verbose := 1
 240endif
 241
 242feature_display_entries = $(eval $(feature_display_entries_code))
 243define feature_display_entries_code
 244  ifeq ($(feature_display),1)
 245    $(info )
 246    $(info Auto-detecting system features:)
 247    $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
 248    ifneq ($(feature_verbose),1)
 249      $(info )
 250    endif
 251  endif
 252
 253  ifeq ($(feature_verbose),1)
 254    TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
 255    $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
 256    $(info )
 257  endif
 258endef
 259
 260ifeq ($(FEATURE_DISPLAY_DEFERRED),)
 261  $(call feature_display_entries)
 262endif
 263