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