Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1feature_dir := $(srctree)/tools/build/feature
2
3ifneq ($(OUTPUT),)
4 OUTPUT_FEATURES = $(OUTPUT)feature/
5 $(shell mkdir -p $(OUTPUT_FEATURES))
6endif
7
8feature_check = $(eval $(feature_check_code))
9define feature_check_code
10 feature-$(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)
11endef
12
13feature_set = $(eval $(feature_set_code))
14define feature_set_code
15 feature-$(1) := 1
16endef
17
18#
19# Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
20#
21
22#
23# Note that this is not a complete list of all feature tests, just
24# those that are typically built on a fully configured system.
25#
26# [ Feature tests not mentioned here have to be built explicitly in
27# the rule that uses them - an example for that is the 'bionic'
28# feature check. ]
29#
30FEATURE_TESTS_BASIC := \
31 backtrace \
32 dwarf \
33 dwarf_getlocations \
34 fortify-source \
35 sync-compare-and-swap \
36 glibc \
37 gtk2 \
38 gtk2-infobar \
39 libaudit \
40 libbfd \
41 libelf \
42 libelf-getphdrnum \
43 libelf-gelf_getnote \
44 libelf-getshdrstrndx \
45 libelf-mmap \
46 libnuma \
47 numa_num_possible_cpus \
48 libperl \
49 libpython \
50 libpython-version \
51 libslang \
52 libcrypto \
53 libunwind \
54 libunwind-x86 \
55 libunwind-x86_64 \
56 libunwind-arm \
57 libunwind-aarch64 \
58 pthread-attr-setaffinity-np \
59 pthread-barrier \
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 libopencsd
71
72# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
73# of all feature tests
74FEATURE_TESTS_EXTRA := \
75 bionic \
76 compile-32 \
77 compile-x32 \
78 cplus-demangle \
79 hello \
80 libbabeltrace \
81 liberty \
82 liberty-z \
83 libunwind-debug-frame \
84 libunwind-debug-frame-arm \
85 libunwind-debug-frame-aarch64
86
87FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
88
89ifeq ($(FEATURE_TESTS),all)
90 FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
91endif
92
93FEATURE_DISPLAY ?= \
94 dwarf \
95 dwarf_getlocations \
96 glibc \
97 gtk2 \
98 libaudit \
99 libbfd \
100 libelf \
101 libnuma \
102 numa_num_possible_cpus \
103 libperl \
104 libpython \
105 libslang \
106 libcrypto \
107 libunwind \
108 libdw-dwarf-unwind \
109 zlib \
110 lzma \
111 get_cpuid \
112 bpf
113
114# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
115# If in the future we need per-feature checks/flags for features not
116# mentioned in this list we need to refactor this ;-).
117set_test_all_flags = $(eval $(set_test_all_flags_code))
118define set_test_all_flags_code
119 FEATURE_CHECK_CFLAGS-all += $(FEATURE_CHECK_CFLAGS-$(1))
120 FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
121endef
122
123$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
124
125#
126# Special fast-path for the 'all features are available' case:
127#
128$(call feature_check,all,$(MSG))
129
130#
131# Just in case the build freshly failed, make sure we print the
132# feature matrix:
133#
134ifeq ($(feature-all), 1)
135 #
136 # test-all.c passed - just set all the core feature flags to 1:
137 #
138 $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
139 #
140 # test-all.c does not comprise these tests, so we need to
141 # for this case to get features proper values
142 #
143 $(call feature_check,compile-32)
144 $(call feature_check,compile-x32)
145 $(call feature_check,bionic)
146 $(call feature_check,libbabeltrace)
147else
148 $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
149endif
150
151#
152# Print the result of the feature test:
153#
154feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
155
156define feature_print_status_code
157 ifeq ($(feature-$(1)), 1)
158 MSG = $(shell printf '...%30s: [ \033[32mon\033[m ]' $(1))
159 else
160 MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
161 endif
162endef
163
164feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
165define feature_print_text_code
166 MSG = $(shell printf '...%30s: %s' $(1) $(2))
167endef
168
169#
170# generates feature value assignment for name, like:
171# $(call feature_assign,dwarf) == feature-dwarf=1
172#
173feature_assign = feature-$(1)=$(feature-$(1))
174
175FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
176FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
177
178feature_dump_check = $(eval $(feature_dump_check_code))
179define feature_dump_check_code
180 ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
181 $(2) := 1
182 endif
183endef
184
185#
186# First check if any test from FEATURE_DISPLAY
187# and set feature_display := 1 if it does
188$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
189
190#
191# Now also check if any other test changed,
192# so we force FEATURE-DUMP generation
193$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
194
195# The $(feature_display) controls the default detection message
196# output. It's set if:
197# - detected features differes from stored features from
198# last build (in $(FEATURE_DUMP_FILENAME) file)
199# - one of the $(FEATURE_DISPLAY) is not detected
200# - VF is enabled
201
202ifeq ($(feature_dump_changed),1)
203 $(shell rm -f $(FEATURE_DUMP_FILENAME))
204 $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
205endif
206
207feature_display_check = $(eval $(feature_check_display_code))
208define feature_check_display_code
209 ifneq ($(feature-$(1)), 1)
210 feature_display := 1
211 endif
212endef
213
214$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
215
216ifeq ($(VF),1)
217 feature_display := 1
218 feature_verbose := 1
219endif
220
221ifeq ($(feature_display),1)
222 $(info )
223 $(info Auto-detecting system features:)
224 $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
225 ifneq ($(feature_verbose),1)
226 $(info )
227 endif
228endif
229
230ifeq ($(feature_verbose),1)
231 TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
232 $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
233 $(info )
234endif