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