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 libcapstone \
91 libbfd-liberty \
92 libbfd-liberty-z \
93 libopencsd \
94 libunwind-x86 \
95 libunwind-x86_64 \
96 libunwind-arm \
97 libunwind-aarch64 \
98 libunwind-debug-frame \
99 libunwind-debug-frame-arm \
100 libunwind-debug-frame-aarch64 \
101 cxx \
102 llvm \
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 libcapstone \
138 llvm-perf \
139 zlib \
140 lzma \
141 get_cpuid \
142 bpf \
143 libaio \
144 libzstd
145
146#
147# Declare group members of a feature to display the logical OR of the detection
148# result instead of each member result.
149#
150FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
151
152#
153# Declare list of feature dependency packages that provide pkg-config files.
154#
155FEATURE_PKG_CONFIG ?= \
156 libtraceevent \
157 libtracefs
158
159feature_pkg_config = $(eval $(feature_pkg_config_code))
160define feature_pkg_config_code
161 FEATURE_CHECK_CFLAGS-$(1) := $(shell $(PKG_CONFIG) --cflags $(1) 2>/dev/null)
162 FEATURE_CHECK_LDFLAGS-$(1) := $(shell $(PKG_CONFIG) --libs $(1) 2>/dev/null)
163endef
164
165# Set FEATURE_CHECK_(C|LD)FLAGS-$(package) for packages using pkg-config.
166ifneq ($(PKG_CONFIG),)
167 $(foreach package,$(FEATURE_PKG_CONFIG),$(call feature_pkg_config,$(package)))
168endif
169
170# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
171# If in the future we need per-feature checks/flags for features not
172# mentioned in this list we need to refactor this ;-).
173set_test_all_flags = $(eval $(set_test_all_flags_code))
174define set_test_all_flags_code
175 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
176 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
177endef
178
179$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
180
181#
182# Special fast-path for the 'all features are available' case:
183#
184$(call feature_check,all,$(MSG))
185
186#
187# Just in case the build freshly failed, make sure we print the
188# feature matrix:
189#
190ifeq ($(feature-all), 1)
191 #
192 # test-all.c passed - just set all the core feature flags to 1:
193 #
194 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
195 #
196 # test-all.c does not comprise these tests, so we need to
197 # for this case to get features proper values
198 #
199 $(call feature_check,compile-32)
200 $(call feature_check,compile-x32)
201 $(call feature_check,bionic)
202 $(call feature_check,libbabeltrace)
203else
204 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
205endif
206
207#
208# Print the result of the feature test:
209#
210feature_print_status = $(eval $(feature_print_status_code))
211
212feature_group = $(eval $(feature_gen_group)) $(GROUP)
213
214define feature_gen_group
215 GROUP := $(1)
216 ifneq ($(feature_verbose),1)
217 GROUP += $(FEATURE_GROUP_MEMBERS-$(1))
218 endif
219endef
220
221define feature_print_status_code
222 ifneq (,$(filter 1,$(foreach feat,$(call feature_group,$(feat)),$(feature-$(feat)))))
223 MSG = $(shell printf '...%40s: [ \033[32mon\033[m ]' $(1))
224 else
225 MSG = $(shell printf '...%40s: [ \033[31mOFF\033[m ]' $(1))
226 endif
227endef
228
229feature_print_text = $(eval $(feature_print_text_code))
230define feature_print_text_code
231 MSG = $(shell printf '...%40s: %s' $(1) $(2))
232endef
233
234#
235# generates feature value assignment for name, like:
236# $(call feature_assign,dwarf) == feature-dwarf=1
237#
238feature_assign = feature-$(1)=$(feature-$(1))
239
240FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
241FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
242
243feature_dump_check = $(eval $(feature_dump_check_code))
244define feature_dump_check_code
245 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
246 $(2) := 1
247 endif
248endef
249
250#
251# First check if any test from FEATURE_DISPLAY
252# and set feature_display := 1 if it does
253$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
254
255#
256# Now also check if any other test changed,
257# so we force FEATURE-DUMP generation
258$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
259
260# The $(feature_display) controls the default detection message
261# output. It's set if:
262# - detected features differes from stored features from
263# last build (in $(FEATURE_DUMP_FILENAME) file)
264# - one of the $(FEATURE_DISPLAY) is not detected
265# - VF is enabled
266
267ifeq ($(feature_dump_changed),1)
268 $(shell rm -f $(FEATURE_DUMP_FILENAME))
269 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
270endif
271
272feature_display_check = $(eval $(feature_check_display_code))
273define feature_check_display_code
274 ifneq ($(feature-$(1)), 1)
275 feature_display := 1
276 endif
277endef
278
279$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
280
281ifeq ($(VF),1)
282 feature_display := 1
283 feature_verbose := 1
284endif
285
286ifneq ($(feature_verbose),1)
287 #
288 # Determine the features to omit from the displayed message, as only the
289 # logical OR of the detection result will be shown.
290 #
291 FEATURE_OMIT := $(foreach feat,$(FEATURE_DISPLAY),$(FEATURE_GROUP_MEMBERS-$(feat)))
292endif
293
294feature_display_entries = $(eval $(feature_display_entries_code))
295define feature_display_entries_code
296 ifeq ($(feature_display),1)
297 $$(info )
298 $$(info Auto-detecting system features:)
299 $(foreach feat,$(filter-out $(FEATURE_OMIT),$(FEATURE_DISPLAY)),$(call feature_print_status,$(feat),) $$(info $(MSG)))
300 endif
301
302 ifeq ($(feature_verbose),1)
303 $(eval TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)))
304 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),) $$(info $(MSG)))
305 endif
306endef
307
308ifeq ($(FEATURE_DISPLAY_DEFERRED),)
309 $(call feature_display_entries)
310 $(info )
311endif