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#
31# These + the ones in FEATURE_TESTS_EXTRA are included in
32# tools/build/feature/test-all.c and we try to build it all together
33# then setting all those features to '1' meaning they are all enabled.
34#
35# There are things like fortify-source that will be set to 1 because test-all
36# is built with the flags needed to test if its enabled, resulting in
37#
38# $ rm -rf /tmp/b ; mkdir /tmp/b ; make -C tools/perf O=/tmp/b feature-dump
39# $ grep fortify-source /tmp/b/FEATURE-DUMP
40# feature-fortify-source=1
41# $
42#
43# All the others should have lines in tools/build/feature/test-all.c like:
44#
45# #define main main_test_disassembler_init_styled
46# # include "test-disassembler-init-styled.c"
47# #undef main
48#
49# #define main main_test_libzstd
50# # include "test-libzstd.c"
51# #undef main
52#
53# int main(int argc, char *argv[])
54# {
55# main_test_disassembler_four_args();
56# main_test_libzstd();
57# return 0;
58# }
59#
60# If the sample above works, then we end up with these lines in the FEATURE-DUMP
61# file:
62#
63# feature-disassembler-four-args=1
64# feature-libzstd=1
65#
66FEATURE_TESTS_BASIC := \
67 backtrace \
68 libdw \
69 eventfd \
70 fortify-source \
71 gettid \
72 glibc \
73 libbfd \
74 libbfd-buildid \
75 libelf \
76 libelf-getphdrnum \
77 libelf-gelf_getnote \
78 libelf-getshdrstrndx \
79 libelf-zstd \
80 libnuma \
81 numa_num_possible_cpus \
82 libpython \
83 libslang \
84 libtraceevent \
85 libcpupower \
86 pthread-attr-setaffinity-np \
87 pthread-barrier \
88 reallocarray \
89 stackprotector-all \
90 timerfd \
91 zlib \
92 lzma \
93 bpf \
94 scandirat \
95 sched_getcpu \
96 sdt \
97 setns \
98 libaio \
99 libzstd \
100 disassembler-four-args \
101 disassembler-init-styled \
102 file-handle \
103 libopenssl
104
105# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
106# of all feature tests
107FEATURE_TESTS_EXTRA := \
108 bionic \
109 compile-32 \
110 compile-x32 \
111 cplus-demangle \
112 cxa-demangle \
113 gtk2 \
114 gtk2-infobar \
115 hello \
116 libbabeltrace \
117 libcapstone \
118 libbfd-liberty \
119 libbfd-liberty-z \
120 libopencsd \
121 libperl \
122 cxx \
123 llvm \
124 clang \
125 libbpf \
126 libpfm4 \
127 libdebuginfod \
128 clang-bpf-co-re \
129 bpftool-skeletons
130
131
132FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
133
134ifeq ($(FEATURE_TESTS),all)
135 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
136endif
137
138FEATURE_DISPLAY ?= \
139 libdw \
140 glibc \
141 libelf \
142 libnuma \
143 numa_num_possible_cpus \
144 libpython \
145 libcapstone \
146 llvm-perf \
147 zlib \
148 lzma \
149 bpf \
150 libaio \
151 libzstd \
152 libopenssl
153
154#
155# Declare group members of a feature to display the logical OR of the detection
156# result instead of each member result.
157#
158FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
159
160#
161# Declare list of feature dependency packages that provide pkg-config files.
162#
163FEATURE_PKG_CONFIG ?= \
164 libtraceevent \
165 libtracefs
166
167feature_pkg_config = $(eval $(feature_pkg_config_code))
168define feature_pkg_config_code
169 FEATURE_CHECK_CFLAGS-$(1) := $(shell $(PKG_CONFIG) --cflags $(1) 2>/dev/null)
170 FEATURE_CHECK_LDFLAGS-$(1) := $(shell $(PKG_CONFIG) --libs $(1) 2>/dev/null)
171endef
172
173# Set FEATURE_CHECK_(C|LD)FLAGS-$(package) for packages using pkg-config.
174ifneq ($(PKG_CONFIG),)
175 $(foreach package,$(FEATURE_PKG_CONFIG),$(call feature_pkg_config,$(package)))
176endif
177
178# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
179# If in the future we need per-feature checks/flags for features not
180# mentioned in this list we need to refactor this ;-).
181set_test_all_flags = $(eval $(set_test_all_flags_code))
182define set_test_all_flags_code
183 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
184 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
185endef
186
187$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
188
189#
190# Special fast-path for the 'all features are available' case:
191#
192$(call feature_check,all,$(MSG))
193
194#
195# Just in case the build freshly failed, make sure we print the
196# feature matrix:
197#
198ifeq ($(feature-all), 1)
199 #
200 # test-all.c passed - just set all the core feature flags to 1:
201 #
202 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
203 #
204 # test-all.c does not comprise these tests, so we need to
205 # for this case to get features proper values
206 #
207 $(call feature_check,compile-32)
208 $(call feature_check,compile-x32)
209 $(call feature_check,bionic)
210 $(call feature_check,libbabeltrace)
211else
212 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
213endif
214
215#
216# Print the result of the feature test:
217#
218feature_print_status = $(eval $(feature_print_status_code))
219
220feature_group = $(eval $(feature_gen_group)) $(GROUP)
221
222define feature_gen_group
223 GROUP := $(1)
224 ifneq ($(feature_verbose),1)
225 GROUP += $(FEATURE_GROUP_MEMBERS-$(1))
226 endif
227endef
228
229define feature_print_status_code
230 ifneq (,$(filter 1,$(foreach feat,$(call feature_group,$(feat)),$(feature-$(feat)))))
231 MSG = $(shell printf '...%40s: [ \033[32mon\033[m ]' $(1))
232 else
233 MSG = $(shell printf '...%40s: [ \033[31mOFF\033[m ]' $(1))
234 endif
235endef
236
237feature_print_text = $(eval $(feature_print_text_code))
238define feature_print_text_code
239 MSG = $(shell printf '...%40s: %s' $(1) $(2))
240endef
241
242#
243# generates feature value assignment for name, like:
244# $(call feature_assign,libdw) == feature-libdw=1
245#
246feature_assign = feature-$(1)=$(feature-$(1))
247
248FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
249FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
250
251feature_dump_check = $(eval $(feature_dump_check_code))
252define feature_dump_check_code
253 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
254 $(2) := 1
255 endif
256endef
257
258#
259# First check if any test from FEATURE_DISPLAY
260# and set feature_display := 1 if it does
261$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
262
263#
264# Now also check if any other test changed,
265# so we force FEATURE-DUMP generation
266$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
267
268# The $(feature_display) controls the default detection message
269# output. It's set if:
270# - detected features differes from stored features from
271# last build (in $(FEATURE_DUMP_FILENAME) file)
272# - one of the $(FEATURE_DISPLAY) is not detected
273# - VF is enabled
274
275ifeq ($(feature_dump_changed),1)
276 $(shell rm -f $(FEATURE_DUMP_FILENAME))
277 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
278endif
279
280feature_display_check = $(eval $(feature_check_display_code))
281define feature_check_display_code
282 ifneq ($(feature-$(1)), 1)
283 feature_display := 1
284 endif
285endef
286
287$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
288
289ifeq ($(VF),1)
290 feature_display := 1
291 feature_verbose := 1
292endif
293
294ifneq ($(feature_verbose),1)
295 #
296 # Determine the features to omit from the displayed message, as only the
297 # logical OR of the detection result will be shown.
298 #
299 FEATURE_OMIT := $(foreach feat,$(FEATURE_DISPLAY),$(FEATURE_GROUP_MEMBERS-$(feat)))
300endif
301
302feature_display_entries = $(eval $(feature_display_entries_code))
303define feature_display_entries_code
304 ifeq ($(feature_display),1)
305 $$(info )
306 $$(info Auto-detecting system features:)
307 $(foreach feat,$(filter-out $(FEATURE_OMIT),$(FEATURE_DISPLAY)),$(call feature_print_status,$(feat),) $$(info $(MSG)))
308 endif
309
310 ifeq ($(feature_verbose),1)
311 $(eval TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)))
312 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),) $$(info $(MSG)))
313 endif
314endef
315
316ifeq ($(FEATURE_DISPLAY_DEFERRED),)
317 $(call feature_display_entries)
318 ifeq ($(feature_display),1)
319 $(info )
320 endif
321endif