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