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 get_current_dir_name \
72 gettid \
73 glibc \
74 libbfd \
75 libbfd-buildid \
76 libelf \
77 libelf-getphdrnum \
78 libelf-gelf_getnote \
79 libelf-getshdrstrndx \
80 libelf-zstd \
81 libnuma \
82 numa_num_possible_cpus \
83 libperl \
84 libpython \
85 libslang \
86 libtraceevent \
87 libtracefs \
88 libcpupower \
89 pthread-attr-setaffinity-np \
90 pthread-barrier \
91 reallocarray \
92 stackprotector-all \
93 timerfd \
94 zlib \
95 lzma \
96 get_cpuid \
97 bpf \
98 scandirat \
99 sched_getcpu \
100 sdt \
101 setns \
102 libaio \
103 libzstd \
104 disassembler-four-args \
105 disassembler-init-styled \
106 file-handle
107
108# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
109# of all feature tests
110FEATURE_TESTS_EXTRA := \
111 bionic \
112 compile-32 \
113 compile-x32 \
114 cplus-demangle \
115 cxa-demangle \
116 gtk2 \
117 gtk2-infobar \
118 hello \
119 libbabeltrace \
120 libcapstone \
121 libbfd-liberty \
122 libbfd-liberty-z \
123 libopencsd \
124 cxx \
125 llvm \
126 clang \
127 libbpf \
128 libbpf-strings \
129 libpfm4 \
130 libdebuginfod \
131 clang-bpf-co-re \
132 bpftool-skeletons
133
134
135FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
136
137ifeq ($(FEATURE_TESTS),all)
138 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
139endif
140
141FEATURE_DISPLAY ?= \
142 libdw \
143 glibc \
144 libelf \
145 libnuma \
146 numa_num_possible_cpus \
147 libperl \
148 libpython \
149 libcapstone \
150 llvm-perf \
151 zlib \
152 lzma \
153 get_cpuid \
154 bpf \
155 libaio \
156 libzstd
157
158#
159# Declare group members of a feature to display the logical OR of the detection
160# result instead of each member result.
161#
162FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
163
164#
165# Declare list of feature dependency packages that provide pkg-config files.
166#
167FEATURE_PKG_CONFIG ?= \
168 libtraceevent \
169 libtracefs
170
171feature_pkg_config = $(eval $(feature_pkg_config_code))
172define feature_pkg_config_code
173 FEATURE_CHECK_CFLAGS-$(1) := $(shell $(PKG_CONFIG) --cflags $(1) 2>/dev/null)
174 FEATURE_CHECK_LDFLAGS-$(1) := $(shell $(PKG_CONFIG) --libs $(1) 2>/dev/null)
175endef
176
177# Set FEATURE_CHECK_(C|LD)FLAGS-$(package) for packages using pkg-config.
178ifneq ($(PKG_CONFIG),)
179 $(foreach package,$(FEATURE_PKG_CONFIG),$(call feature_pkg_config,$(package)))
180endif
181
182# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
183# If in the future we need per-feature checks/flags for features not
184# mentioned in this list we need to refactor this ;-).
185set_test_all_flags = $(eval $(set_test_all_flags_code))
186define set_test_all_flags_code
187 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
188 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
189endef
190
191$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
192
193#
194# Special fast-path for the 'all features are available' case:
195#
196$(call feature_check,all,$(MSG))
197
198#
199# Just in case the build freshly failed, make sure we print the
200# feature matrix:
201#
202ifeq ($(feature-all), 1)
203 #
204 # test-all.c passed - just set all the core feature flags to 1:
205 #
206 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
207 #
208 # test-all.c does not comprise these tests, so we need to
209 # for this case to get features proper values
210 #
211 $(call feature_check,compile-32)
212 $(call feature_check,compile-x32)
213 $(call feature_check,bionic)
214 $(call feature_check,libbabeltrace)
215else
216 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
217endif
218
219#
220# Print the result of the feature test:
221#
222feature_print_status = $(eval $(feature_print_status_code))
223
224feature_group = $(eval $(feature_gen_group)) $(GROUP)
225
226define feature_gen_group
227 GROUP := $(1)
228 ifneq ($(feature_verbose),1)
229 GROUP += $(FEATURE_GROUP_MEMBERS-$(1))
230 endif
231endef
232
233define feature_print_status_code
234 ifneq (,$(filter 1,$(foreach feat,$(call feature_group,$(feat)),$(feature-$(feat)))))
235 MSG = $(shell printf '...%40s: [ \033[32mon\033[m ]' $(1))
236 else
237 MSG = $(shell printf '...%40s: [ \033[31mOFF\033[m ]' $(1))
238 endif
239endef
240
241feature_print_text = $(eval $(feature_print_text_code))
242define feature_print_text_code
243 MSG = $(shell printf '...%40s: %s' $(1) $(2))
244endef
245
246#
247# generates feature value assignment for name, like:
248# $(call feature_assign,libdw) == feature-libdw=1
249#
250feature_assign = feature-$(1)=$(feature-$(1))
251
252FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
253FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
254
255feature_dump_check = $(eval $(feature_dump_check_code))
256define feature_dump_check_code
257 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
258 $(2) := 1
259 endif
260endef
261
262#
263# First check if any test from FEATURE_DISPLAY
264# and set feature_display := 1 if it does
265$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
266
267#
268# Now also check if any other test changed,
269# so we force FEATURE-DUMP generation
270$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
271
272# The $(feature_display) controls the default detection message
273# output. It's set if:
274# - detected features differes from stored features from
275# last build (in $(FEATURE_DUMP_FILENAME) file)
276# - one of the $(FEATURE_DISPLAY) is not detected
277# - VF is enabled
278
279ifeq ($(feature_dump_changed),1)
280 $(shell rm -f $(FEATURE_DUMP_FILENAME))
281 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
282endif
283
284feature_display_check = $(eval $(feature_check_display_code))
285define feature_check_display_code
286 ifneq ($(feature-$(1)), 1)
287 feature_display := 1
288 endif
289endef
290
291$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
292
293ifeq ($(VF),1)
294 feature_display := 1
295 feature_verbose := 1
296endif
297
298ifneq ($(feature_verbose),1)
299 #
300 # Determine the features to omit from the displayed message, as only the
301 # logical OR of the detection result will be shown.
302 #
303 FEATURE_OMIT := $(foreach feat,$(FEATURE_DISPLAY),$(FEATURE_GROUP_MEMBERS-$(feat)))
304endif
305
306feature_display_entries = $(eval $(feature_display_entries_code))
307define feature_display_entries_code
308 ifeq ($(feature_display),1)
309 $$(info )
310 $$(info Auto-detecting system features:)
311 $(foreach feat,$(filter-out $(FEATURE_OMIT),$(FEATURE_DISPLAY)),$(call feature_print_status,$(feat),) $$(info $(MSG)))
312 endif
313
314 ifeq ($(feature_verbose),1)
315 $(eval TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)))
316 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),) $$(info $(MSG)))
317 endif
318endef
319
320ifeq ($(FEATURE_DISPLAY_DEFERRED),)
321 $(call feature_display_entries)
322 $(info )
323endif