xref: /linux/tools/build/Makefile.feature (revision 5e3992fe72748ed3892be876f09d4d990548b7af) 
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        libslang                        \
52        libslang-include-subdir         \
53        libtraceevent                   \
54        libtracefs                      \
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        scandirat			\
68        sched_getcpu			\
69        sdt				\
70        setns				\
71        libaio				\
72        libzstd				\
73        disassembler-four-args		\
74        disassembler-init-styled	\
75        file-handle
76
77# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
78# of all feature tests
79FEATURE_TESTS_EXTRA :=                  \
80         bionic                         \
81         compile-32                     \
82         compile-x32                    \
83         cplus-demangle                 \
84         cxa-demangle                   \
85         gtk2                           \
86         gtk2-infobar                   \
87         hello                          \
88         libbabeltrace                  \
89         libbfd-liberty                 \
90         libbfd-liberty-z               \
91         libopencsd                     \
92         libunwind-x86                  \
93         libunwind-x86_64               \
94         libunwind-arm                  \
95         libunwind-aarch64              \
96         libunwind-debug-frame          \
97         libunwind-debug-frame-arm      \
98         libunwind-debug-frame-aarch64  \
99         cxx                            \
100         llvm                           \
101         llvm-version                   \
102         clang                          \
103         libbpf                         \
104         libbpf-btf__load_from_kernel_by_id \
105         libbpf-bpf_prog_load           \
106         libbpf-bpf_object__next_program \
107         libbpf-bpf_object__next_map    \
108         libbpf-bpf_program__set_insns  \
109         libbpf-bpf_create_map		\
110         libpfm4                        \
111         libdebuginfod			\
112         clang-bpf-co-re
113
114
115FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
116
117ifeq ($(FEATURE_TESTS),all)
118  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
119endif
120
121FEATURE_DISPLAY ?=              \
122         dwarf                  \
123         dwarf_getlocations     \
124         glibc                  \
125         libbfd                 \
126         libbfd-buildid		\
127         libcap                 \
128         libelf                 \
129         libnuma                \
130         numa_num_possible_cpus \
131         libperl                \
132         libpython              \
133         libcrypto              \
134         libunwind              \
135         libdw-dwarf-unwind     \
136         zlib                   \
137         lzma                   \
138         get_cpuid              \
139         bpf			\
140         libaio			\
141         libzstd
142
143#
144# Declare group members of a feature to display the logical OR of the detection
145# result instead of each member result.
146#
147FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
148
149# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
150# If in the future we need per-feature checks/flags for features not
151# mentioned in this list we need to refactor this ;-).
152set_test_all_flags = $(eval $(set_test_all_flags_code))
153define set_test_all_flags_code
154  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
155  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
156endef
157
158$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
159
160#
161# Special fast-path for the 'all features are available' case:
162#
163$(call feature_check,all,$(MSG))
164
165#
166# Just in case the build freshly failed, make sure we print the
167# feature matrix:
168#
169ifeq ($(feature-all), 1)
170  #
171  # test-all.c passed - just set all the core feature flags to 1:
172  #
173  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
174  #
175  # test-all.c does not comprise these tests, so we need to
176  # for this case to get features proper values
177  #
178  $(call feature_check,compile-32)
179  $(call feature_check,compile-x32)
180  $(call feature_check,bionic)
181  $(call feature_check,libbabeltrace)
182else
183  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
184endif
185
186#
187# Print the result of the feature test:
188#
189feature_print_status = $(eval $(feature_print_status_code))
190
191feature_group = $(eval $(feature_gen_group)) $(GROUP)
192
193define feature_gen_group
194  GROUP := $(1)
195  ifneq ($(feature_verbose),1)
196    GROUP += $(FEATURE_GROUP_MEMBERS-$(1))
197  endif
198endef
199
200define feature_print_status_code
201  ifneq (,$(filter 1,$(foreach feat,$(call feature_group,$(feat)),$(feature-$(feat)))))
202    MSG = $(shell printf '...%40s: [ \033[32mon\033[m  ]' $(1))
203  else
204    MSG = $(shell printf '...%40s: [ \033[31mOFF\033[m ]' $(1))
205  endif
206endef
207
208feature_print_text = $(eval $(feature_print_text_code))
209define feature_print_text_code
210    MSG = $(shell printf '...%40s: %s' $(1) $(2))
211endef
212
213#
214# generates feature value assignment for name, like:
215#   $(call feature_assign,dwarf) == feature-dwarf=1
216#
217feature_assign = feature-$(1)=$(feature-$(1))
218
219FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
220FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
221
222feature_dump_check = $(eval $(feature_dump_check_code))
223define feature_dump_check_code
224  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
225    $(2) := 1
226  endif
227endef
228
229#
230# First check if any test from FEATURE_DISPLAY
231# and set feature_display := 1 if it does
232$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
233
234#
235# Now also check if any other test changed,
236# so we force FEATURE-DUMP generation
237$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
238
239# The $(feature_display) controls the default detection message
240# output. It's set if:
241# - detected features differes from stored features from
242#   last build (in $(FEATURE_DUMP_FILENAME) file)
243# - one of the $(FEATURE_DISPLAY) is not detected
244# - VF is enabled
245
246ifeq ($(feature_dump_changed),1)
247  $(shell rm -f $(FEATURE_DUMP_FILENAME))
248  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
249endif
250
251feature_display_check = $(eval $(feature_check_display_code))
252define feature_check_display_code
253  ifneq ($(feature-$(1)), 1)
254    feature_display := 1
255  endif
256endef
257
258$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
259
260ifeq ($(VF),1)
261  feature_display := 1
262  feature_verbose := 1
263endif
264
265ifneq ($(feature_verbose),1)
266  #
267  # Determine the features to omit from the displayed message, as only the
268  # logical OR of the detection result will be shown.
269  #
270  FEATURE_OMIT := $(foreach feat,$(FEATURE_DISPLAY),$(FEATURE_GROUP_MEMBERS-$(feat)))
271endif
272
273feature_display_entries = $(eval $(feature_display_entries_code))
274define feature_display_entries_code
275  ifeq ($(feature_display),1)
276    $$(info )
277    $$(info Auto-detecting system features:)
278    $(foreach feat,$(filter-out $(FEATURE_OMIT),$(FEATURE_DISPLAY)),$(call feature_print_status,$(feat),) $$(info $(MSG)))
279  endif
280
281  ifeq ($(feature_verbose),1)
282    $(eval TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)))
283    $(foreach feat,$(TMP),$(call feature_print_status,$(feat),) $$(info $(MSG)))
284  endif
285endef
286
287ifeq ($(FEATURE_DISPLAY_DEFERRED),)
288  $(call feature_display_entries)
289  $(info )
290endif
291