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 libslang \
52 libslang-include-subdir \
53 libtraceevent \
54 libtracefs \
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 disassembler-init-styled \
74 file-handle
75
76# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
77# of all feature tests
78FEATURE_TESTS_EXTRA := \
79 bionic \
80 compile-32 \
81 compile-x32 \
82 cplus-demangle \
83 gtk2 \
84 gtk2-infobar \
85 hello \
86 libbabeltrace \
87 libbfd-liberty \
88 libbfd-liberty-z \
89 libopencsd \
90 libunwind-x86 \
91 libunwind-x86_64 \
92 libunwind-arm \
93 libunwind-aarch64 \
94 libunwind-debug-frame \
95 libunwind-debug-frame-arm \
96 libunwind-debug-frame-aarch64 \
97 cxx \
98 llvm \
99 llvm-version \
100 clang \
101 libbpf \
102 libbpf-btf__load_from_kernel_by_id \
103 libbpf-bpf_prog_load \
104 libbpf-bpf_object__next_program \
105 libbpf-bpf_object__next_map \
106 libbpf-bpf_create_map \
107 libpfm4 \
108 libdebuginfod \
109 clang-bpf-co-re
110
111
112FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
113
114ifeq ($(FEATURE_TESTS),all)
115 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
116endif
117
118FEATURE_DISPLAY ?= \
119 dwarf \
120 dwarf_getlocations \
121 glibc \
122 libbfd \
123 libbfd-buildid \
124 libcap \
125 libelf \
126 libnuma \
127 numa_num_possible_cpus \
128 libperl \
129 libpython \
130 libcrypto \
131 libunwind \
132 libdw-dwarf-unwind \
133 zlib \
134 lzma \
135 get_cpuid \
136 bpf \
137 libaio \
138 libzstd
139
140# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
141# If in the future we need per-feature checks/flags for features not
142# mentioned in this list we need to refactor this ;-).
143set_test_all_flags = $(eval $(set_test_all_flags_code))
144define set_test_all_flags_code
145 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
146 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
147endef
148
149$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
150
151#
152# Special fast-path for the 'all features are available' case:
153#
154$(call feature_check,all,$(MSG))
155
156#
157# Just in case the build freshly failed, make sure we print the
158# feature matrix:
159#
160ifeq ($(feature-all), 1)
161 #
162 # test-all.c passed - just set all the core feature flags to 1:
163 #
164 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
165 #
166 # test-all.c does not comprise these tests, so we need to
167 # for this case to get features proper values
168 #
169 $(call feature_check,compile-32)
170 $(call feature_check,compile-x32)
171 $(call feature_check,bionic)
172 $(call feature_check,libbabeltrace)
173else
174 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
175endif
176
177#
178# Print the result of the feature test:
179#
180feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
181
182define feature_print_status_code
183 ifeq ($(feature-$(1)), 1)
184 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
185 else
186 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
187 endif
188endef
189
190feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
191define feature_print_text_code
192 MSG = $(shell printf '...%30s: %s' $(1) $(2))
193endef
194
195#
196# generates feature value assignment for name, like:
197# $(call feature_assign,dwarf) == feature-dwarf=1
198#
199feature_assign = feature-$(1)=$(feature-$(1))
200
201FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
202FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
203
204feature_dump_check = $(eval $(feature_dump_check_code))
205define feature_dump_check_code
206 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
207 $(2) := 1
208 endif
209endef
210
211#
212# First check if any test from FEATURE_DISPLAY
213# and set feature_display := 1 if it does
214$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
215
216#
217# Now also check if any other test changed,
218# so we force FEATURE-DUMP generation
219$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
220
221# The $(feature_display) controls the default detection message
222# output. It's set if:
223# - detected features differes from stored features from
224# last build (in $(FEATURE_DUMP_FILENAME) file)
225# - one of the $(FEATURE_DISPLAY) is not detected
226# - VF is enabled
227
228ifeq ($(feature_dump_changed),1)
229 $(shell rm -f $(FEATURE_DUMP_FILENAME))
230 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
231endif
232
233feature_display_check = $(eval $(feature_check_display_code))
234define feature_check_display_code
235 ifneq ($(feature-$(1)), 1)
236 feature_display := 1
237 endif
238endef
239
240$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
241
242ifeq ($(VF),1)
243 feature_display := 1
244 feature_verbose := 1
245endif
246
247feature_display_entries = $(eval $(feature_display_entries_code))
248define feature_display_entries_code
249 ifeq ($(feature_display),1)
250 $(info )
251 $(info Auto-detecting system features:)
252 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
253 ifneq ($(feature_verbose),1)
254 $(info )
255 endif
256 endif
257
258 ifeq ($(feature_verbose),1)
259 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
260 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
261 $(info )
262 endif
263endef
264
265ifeq ($(FEATURE_DISPLAY_DEFERRED),)
266 $(call feature_display_entries)
267endif