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