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