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 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