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 eventfd \
36 fortify-source \
37 get_current_dir_name \
38 gettid \
39 glibc \
40 libbfd \
41 libbfd-buildid \
42 libcap \
43 libelf \
44 libelf-getphdrnum \
45 libelf-gelf_getnote \
46 libelf-getshdrstrndx \
47 libnuma \
48 numa_num_possible_cpus \
49 libperl \
50 libpython \
51 libpython-version \
52 libslang \
53 libslang-include-subdir \
54 libtraceevent \
55 libcrypto \
56 libunwind \
57 pthread-attr-setaffinity-np \
58 pthread-barrier \
59 reallocarray \
60 stackprotector-all \
61 timerfd \
62 libdw-dwarf-unwind \
63 zlib \
64 lzma \
65 get_cpuid \
66 bpf \
67 sched_getcpu \
68 sdt \
69 setns \
70 libaio \
71 libzstd \
72 disassembler-four-args \
73 file-handle
74
75# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
76# of all feature tests
77FEATURE_TESTS_EXTRA := \
78 bionic \
79 compile-32 \
80 compile-x32 \
81 cplus-demangle \
82 gtk2 \
83 gtk2-infobar \
84 hello \
85 libbabeltrace \
86 libbfd-liberty \
87 libbfd-liberty-z \
88 libopencsd \
89 libunwind-x86 \
90 libunwind-x86_64 \
91 libunwind-arm \
92 libunwind-aarch64 \
93 libunwind-debug-frame \
94 libunwind-debug-frame-arm \
95 libunwind-debug-frame-aarch64 \
96 cxx \
97 llvm \
98 llvm-version \
99 clang \
100 libbpf \
101 libpfm4 \
102 libdebuginfod \
103 clang-bpf-co-re
104
105
106FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
107
108ifeq ($(FEATURE_TESTS),all)
109 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
110endif
111
112FEATURE_DISPLAY ?= \
113 dwarf \
114 dwarf_getlocations \
115 glibc \
116 libbfd \
117 libbfd-buildid \
118 libcap \
119 libelf \
120 libnuma \
121 numa_num_possible_cpus \
122 libperl \
123 libpython \
124 libcrypto \
125 libunwind \
126 libdw-dwarf-unwind \
127 zlib \
128 lzma \
129 get_cpuid \
130 bpf \
131 libaio \
132 libzstd \
133 disassembler-four-args
134
135# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
136# If in the future we need per-feature checks/flags for features not
137# mentioned in this list we need to refactor this ;-).
138set_test_all_flags = $(eval $(set_test_all_flags_code))
139define set_test_all_flags_code
140 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
141 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
142endef
143
144$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
145
146#
147# Special fast-path for the 'all features are available' case:
148#
149$(call feature_check,all,$(MSG))
150
151#
152# Just in case the build freshly failed, make sure we print the
153# feature matrix:
154#
155ifeq ($(feature-all), 1)
156 #
157 # test-all.c passed - just set all the core feature flags to 1:
158 #
159 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
160 #
161 # test-all.c does not comprise these tests, so we need to
162 # for this case to get features proper values
163 #
164 $(call feature_check,compile-32)
165 $(call feature_check,compile-x32)
166 $(call feature_check,bionic)
167 $(call feature_check,libbabeltrace)
168else
169 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
170endif
171
172#
173# Print the result of the feature test:
174#
175feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
176
177define feature_print_status_code
178 ifeq ($(feature-$(1)), 1)
179 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
180 else
181 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
182 endif
183endef
184
185feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
186define feature_print_text_code
187 MSG = $(shell printf '...%30s: %s' $(1) $(2))
188endef
189
190#
191# generates feature value assignment for name, like:
192# $(call feature_assign,dwarf) == feature-dwarf=1
193#
194feature_assign = feature-$(1)=$(feature-$(1))
195
196FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
197FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
198
199feature_dump_check = $(eval $(feature_dump_check_code))
200define feature_dump_check_code
201 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
202 $(2) := 1
203 endif
204endef
205
206#
207# First check if any test from FEATURE_DISPLAY
208# and set feature_display := 1 if it does
209$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
210
211#
212# Now also check if any other test changed,
213# so we force FEATURE-DUMP generation
214$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
215
216# The $(feature_display) controls the default detection message
217# output. It's set if:
218# - detected features differes from stored features from
219# last build (in $(FEATURE_DUMP_FILENAME) file)
220# - one of the $(FEATURE_DISPLAY) is not detected
221# - VF is enabled
222
223ifeq ($(feature_dump_changed),1)
224 $(shell rm -f $(FEATURE_DUMP_FILENAME))
225 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
226endif
227
228feature_display_check = $(eval $(feature_check_display_code))
229define feature_check_display_code
230 ifneq ($(feature-$(1)), 1)
231 feature_display := 1
232 endif
233endef
234
235$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
236
237ifeq ($(VF),1)
238 feature_display := 1
239 feature_verbose := 1
240endif
241
242feature_display_entries = $(eval $(feature_display_entries_code))
243define feature_display_entries_code
244 ifeq ($(feature_display),1)
245 $(info )
246 $(info Auto-detecting system features:)
247 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
248 ifneq ($(feature_verbose),1)
249 $(info )
250 endif
251 endif
252
253 ifeq ($(feature_verbose),1)
254 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
255 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
256 $(info )
257 endif
258endef
259
260ifeq ($(FEATURE_DISPLAY_DEFERRED),)
261 $(call feature_display_entries)
262endif