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