linux/tools/build/Makefile.feature
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   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        sync-compare-and-swap           \
  38        get_current_dir_name            \
  39        gettid                          \
  40        glibc                           \
  41        libbfd                          \
  42        libbfd-buildid                  \
  43        libcap                          \
  44        libelf                          \
  45        libelf-getphdrnum               \
  46        libelf-gelf_getnote             \
  47        libelf-getshdrstrndx            \
  48        libnuma                         \
  49        numa_num_possible_cpus          \
  50        libperl                         \
  51        libpython                       \
  52        libpython-version               \
  53        libslang                        \
  54        libslang-include-subdir         \
  55        libtraceevent                   \
  56        libcrypto                       \
  57        libunwind                       \
  58        pthread-attr-setaffinity-np     \
  59        pthread-barrier                 \
  60        reallocarray                    \
  61        stackprotector-all              \
  62        timerfd                         \
  63        libdw-dwarf-unwind              \
  64        zlib                            \
  65        lzma                            \
  66        get_cpuid                       \
  67        bpf                             \
  68        sched_getcpu                    \
  69        sdt                             \
  70        setns                           \
  71        libaio                          \
  72        libzstd                         \
  73        disassembler-four-args          \
  74        file-handle
  75
  76# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
  77# of all feature tests
  78FEATURE_TESTS_EXTRA :=                  \
  79         bionic                         \
  80         compile-32                     \
  81         compile-x32                    \
  82         cplus-demangle                 \
  83         gtk2                           \
  84         gtk2-infobar                   \
  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         libpfm4                        \
 103         libdebuginfod                  \
 104         clang-bpf-co-re
 105
 106
 107FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
 108
 109ifeq ($(FEATURE_TESTS),all)
 110  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
 111endif
 112
 113FEATURE_DISPLAY ?=              \
 114         dwarf                  \
 115         dwarf_getlocations     \
 116         glibc                  \
 117         libbfd                 \
 118         libbfd-buildid         \
 119         libcap                 \
 120         libelf                 \
 121         libnuma                \
 122         numa_num_possible_cpus \
 123         libperl                \
 124         libpython              \
 125         libcrypto              \
 126         libunwind              \
 127         libdw-dwarf-unwind     \
 128         zlib                   \
 129         lzma                   \
 130         get_cpuid              \
 131         bpf                    \
 132         libaio                 \
 133         libzstd                \
 134         disassembler-four-args
 135
 136# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
 137# If in the future we need per-feature checks/flags for features not
 138# mentioned in this list we need to refactor this ;-).
 139set_test_all_flags = $(eval $(set_test_all_flags_code))
 140define set_test_all_flags_code
 141  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
 142  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
 143endef
 144
 145$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
 146
 147#
 148# Special fast-path for the 'all features are available' case:
 149#
 150$(call feature_check,all,$(MSG))
 151
 152#
 153# Just in case the build freshly failed, make sure we print the
 154# feature matrix:
 155#
 156ifeq ($(feature-all), 1)
 157  #
 158  # test-all.c passed - just set all the core feature flags to 1:
 159  #
 160  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
 161  #
 162  # test-all.c does not comprise these tests, so we need to
 163  # for this case to get features proper values
 164  #
 165  $(call feature_check,compile-32)
 166  $(call feature_check,compile-x32)
 167  $(call feature_check,bionic)
 168  $(call feature_check,libbabeltrace)
 169else
 170  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
 171endif
 172
 173#
 174# Print the result of the feature test:
 175#
 176feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
 177
 178define feature_print_status_code
 179  ifeq ($(feature-$(1)), 1)
 180    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
 181  else
 182    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
 183  endif
 184endef
 185
 186feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
 187define feature_print_text_code
 188    MSG = $(shell printf '...%30s: %s' $(1) $(2))
 189endef
 190
 191#
 192# generates feature value assignment for name, like:
 193#   $(call feature_assign,dwarf) == feature-dwarf=1
 194#
 195feature_assign = feature-$(1)=$(feature-$(1))
 196
 197FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
 198FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
 199
 200feature_dump_check = $(eval $(feature_dump_check_code))
 201define feature_dump_check_code
 202  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
 203    $(2) := 1
 204  endif
 205endef
 206
 207#
 208# First check if any test from FEATURE_DISPLAY
 209# and set feature_display := 1 if it does
 210$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
 211
 212#
 213# Now also check if any other test changed,
 214# so we force FEATURE-DUMP generation
 215$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
 216
 217# The $(feature_display) controls the default detection message
 218# output. It's set if:
 219# - detected features differes from stored features from
 220#   last build (in $(FEATURE_DUMP_FILENAME) file)
 221# - one of the $(FEATURE_DISPLAY) is not detected
 222# - VF is enabled
 223
 224ifeq ($(feature_dump_changed),1)
 225  $(shell rm -f $(FEATURE_DUMP_FILENAME))
 226  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
 227endif
 228
 229feature_display_check = $(eval $(feature_check_display_code))
 230define feature_check_display_code
 231  ifneq ($(feature-$(1)), 1)
 232    feature_display := 1
 233  endif
 234endef
 235
 236$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
 237
 238ifeq ($(VF),1)
 239  feature_display := 1
 240  feature_verbose := 1
 241endif
 242
 243feature_display_entries = $(eval $(feature_display_entries_code))
 244define feature_display_entries_code
 245  ifeq ($(feature_display),1)
 246    $(info )
 247    $(info Auto-detecting system features:)
 248    $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
 249    ifneq ($(feature_verbose),1)
 250      $(info )
 251    endif
 252  endif
 253
 254  ifeq ($(feature_verbose),1)
 255    TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
 256    $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
 257    $(info )
 258  endif
 259endef
 260
 261ifeq ($(FEATURE_DISPLAY_DEFERRED),)
 262  $(call feature_display_entries)
 263endif
 264