Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 libdw \
34 eventfd \
35 fortify-source \
36 get_current_dir_name \
37 gettid \
38 glibc \
39 libbfd \
40 libbfd-buildid \
41 libcap \
42 libelf \
43 libelf-getphdrnum \
44 libelf-gelf_getnote \
45 libelf-getshdrstrndx \
46 libnuma \
47 numa_num_possible_cpus \
48 libperl \
49 libpython \
50 libslang \
51 libslang-include-subdir \
52 libtraceevent \
53 libtracefs \
54 libcpupower \
55 libcrypto \
56 libunwind \
57 pthread-attr-setaffinity-np \
58 pthread-barrier \
59 reallocarray \
60 stackprotector-all \
61 timerfd \
62 zlib \
63 lzma \
64 get_cpuid \
65 bpf \
66 scandirat \
67 sched_getcpu \
68 sdt \
69 setns \
70 libaio \
71 libzstd \
72 disassembler-four-args \
73 disassembler-init-styled \
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 cxa-demangle \
84 gtk2 \
85 gtk2-infobar \
86 hello \
87 libbabeltrace \
88 libcapstone \
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 clang \
102 libbpf \
103 libbpf-btf__load_from_kernel_by_id \
104 libbpf-bpf_prog_load \
105 libbpf-bpf_object__next_program \
106 libbpf-bpf_object__next_map \
107 libbpf-bpf_program__set_insns \
108 libbpf-bpf_create_map \
109 libpfm4 \
110 libdebuginfod \
111 clang-bpf-co-re
112
113
114FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
115
116ifeq ($(FEATURE_TESTS),all)
117 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
118endif
119
120FEATURE_DISPLAY ?= \
121 libdw \
122 glibc \
123 libbfd \
124 libbfd-buildid \
125 libcap \
126 libelf \
127 libnuma \
128 numa_num_possible_cpus \
129 libperl \
130 libpython \
131 libcrypto \
132 libunwind \
133 libcapstone \
134 llvm-perf \
135 zlib \
136 lzma \
137 get_cpuid \
138 bpf \
139 libaio \
140 libzstd
141
142#
143# Declare group members of a feature to display the logical OR of the detection
144# result instead of each member result.
145#
146FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
147
148#
149# Declare list of feature dependency packages that provide pkg-config files.
150#
151FEATURE_PKG_CONFIG ?= \
152 libtraceevent \
153 libtracefs
154
155feature_pkg_config = $(eval $(feature_pkg_config_code))
156define feature_pkg_config_code
157 FEATURE_CHECK_CFLAGS-$(1) := $(shell $(PKG_CONFIG) --cflags $(1) 2>/dev/null)
158 FEATURE_CHECK_LDFLAGS-$(1) := $(shell $(PKG_CONFIG) --libs $(1) 2>/dev/null)
159endef
160
161# Set FEATURE_CHECK_(C|LD)FLAGS-$(package) for packages using pkg-config.
162ifneq ($(PKG_CONFIG),)
163 $(foreach package,$(FEATURE_PKG_CONFIG),$(call feature_pkg_config,$(package)))
164endif
165
166# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
167# If in the future we need per-feature checks/flags for features not
168# mentioned in this list we need to refactor this ;-).
169set_test_all_flags = $(eval $(set_test_all_flags_code))
170define set_test_all_flags_code
171 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
172 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
173endef
174
175$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
176
177#
178# Special fast-path for the 'all features are available' case:
179#
180$(call feature_check,all,$(MSG))
181
182#
183# Just in case the build freshly failed, make sure we print the
184# feature matrix:
185#
186ifeq ($(feature-all), 1)
187 #
188 # test-all.c passed - just set all the core feature flags to 1:
189 #
190 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
191 #
192 # test-all.c does not comprise these tests, so we need to
193 # for this case to get features proper values
194 #
195 $(call feature_check,compile-32)
196 $(call feature_check,compile-x32)
197 $(call feature_check,bionic)
198 $(call feature_check,libbabeltrace)
199else
200 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
201endif
202
203#
204# Print the result of the feature test:
205#
206feature_print_status = $(eval $(feature_print_status_code))
207
208feature_group = $(eval $(feature_gen_group)) $(GROUP)
209
210define feature_gen_group
211 GROUP := $(1)
212 ifneq ($(feature_verbose),1)
213 GROUP += $(FEATURE_GROUP_MEMBERS-$(1))
214 endif
215endef
216
217define feature_print_status_code
218 ifneq (,$(filter 1,$(foreach feat,$(call feature_group,$(feat)),$(feature-$(feat)))))
219 MSG = $(shell printf '...%40s: [ \033[32mon\033[m ]' $(1))
220 else
221 MSG = $(shell printf '...%40s: [ \033[31mOFF\033[m ]' $(1))
222 endif
223endef
224
225feature_print_text = $(eval $(feature_print_text_code))
226define feature_print_text_code
227 MSG = $(shell printf '...%40s: %s' $(1) $(2))
228endef
229
230#
231# generates feature value assignment for name, like:
232# $(call feature_assign,libdw) == feature-libdw=1
233#
234feature_assign = feature-$(1)=$(feature-$(1))
235
236FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
237FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
238
239feature_dump_check = $(eval $(feature_dump_check_code))
240define feature_dump_check_code
241 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
242 $(2) := 1
243 endif
244endef
245
246#
247# First check if any test from FEATURE_DISPLAY
248# and set feature_display := 1 if it does
249$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
250
251#
252# Now also check if any other test changed,
253# so we force FEATURE-DUMP generation
254$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
255
256# The $(feature_display) controls the default detection message
257# output. It's set if:
258# - detected features differes from stored features from
259# last build (in $(FEATURE_DUMP_FILENAME) file)
260# - one of the $(FEATURE_DISPLAY) is not detected
261# - VF is enabled
262
263ifeq ($(feature_dump_changed),1)
264 $(shell rm -f $(FEATURE_DUMP_FILENAME))
265 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
266endif
267
268feature_display_check = $(eval $(feature_check_display_code))
269define feature_check_display_code
270 ifneq ($(feature-$(1)), 1)
271 feature_display := 1
272 endif
273endef
274
275$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
276
277ifeq ($(VF),1)
278 feature_display := 1
279 feature_verbose := 1
280endif
281
282ifneq ($(feature_verbose),1)
283 #
284 # Determine the features to omit from the displayed message, as only the
285 # logical OR of the detection result will be shown.
286 #
287 FEATURE_OMIT := $(foreach feat,$(FEATURE_DISPLAY),$(FEATURE_GROUP_MEMBERS-$(feat)))
288endif
289
290feature_display_entries = $(eval $(feature_display_entries_code))
291define feature_display_entries_code
292 ifeq ($(feature_display),1)
293 $$(info )
294 $$(info Auto-detecting system features:)
295 $(foreach feat,$(filter-out $(FEATURE_OMIT),$(FEATURE_DISPLAY)),$(call feature_print_status,$(feat),) $$(info $(MSG)))
296 endif
297
298 ifeq ($(feature_verbose),1)
299 $(eval TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)))
300 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),) $$(info $(MSG)))
301 endif
302endef
303
304ifeq ($(FEATURE_DISPLAY_DEFERRED),)
305 $(call feature_display_entries)
306 $(info )
307endif