xref: /linux/tools/build/Makefile.feature (revision b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3) 
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        stackprotector-all              \
60        timerfd                         \
61        libdw-dwarf-unwind              \
62        zlib                            \
63        lzma                            \
64        get_cpuid                       \
65        bpf                             \
66        sched_getcpu			\
67        sdt				\
68        setns
69
70# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
71# of all feature tests
72FEATURE_TESTS_EXTRA :=                  \
73         bionic                         \
74         compile-32                     \
75         compile-x32                    \
76         cplus-demangle                 \
77         hello                          \
78         libbabeltrace                  \
79         liberty                        \
80         liberty-z                      \
81         libunwind-debug-frame          \
82         libunwind-debug-frame-arm      \
83         libunwind-debug-frame-aarch64
84
85FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
86
87ifeq ($(FEATURE_TESTS),all)
88  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
89endif
90
91FEATURE_DISPLAY ?=              \
92         dwarf                  \
93         dwarf_getlocations     \
94         glibc                  \
95         gtk2                   \
96         libaudit               \
97         libbfd                 \
98         libelf                 \
99         libnuma                \
100         numa_num_possible_cpus \
101         libperl                \
102         libpython              \
103         libslang               \
104         libcrypto              \
105         libunwind              \
106         libdw-dwarf-unwind     \
107         zlib                   \
108         lzma                   \
109         get_cpuid              \
110         bpf
111
112# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
113# If in the future we need per-feature checks/flags for features not
114# mentioned in this list we need to refactor this ;-).
115set_test_all_flags = $(eval $(set_test_all_flags_code))
116define set_test_all_flags_code
117  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
118  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
119endef
120
121$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
122
123#
124# Special fast-path for the 'all features are available' case:
125#
126$(call feature_check,all,$(MSG))
127
128#
129# Just in case the build freshly failed, make sure we print the
130# feature matrix:
131#
132ifeq ($(feature-all), 1)
133  #
134  # test-all.c passed - just set all the core feature flags to 1:
135  #
136  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
137  #
138  # test-all.c does not comprise these tests, so we need to
139  # for this case to get features proper values
140  #
141  $(call feature_check,compile-32)
142  $(call feature_check,compile-x32)
143  $(call feature_check,bionic)
144  $(call feature_check,libbabeltrace)
145else
146  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
147endif
148
149#
150# Print the result of the feature test:
151#
152feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
153
154define feature_print_status_code
155  ifeq ($(feature-$(1)), 1)
156    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
157  else
158    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
159  endif
160endef
161
162feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
163define feature_print_text_code
164    MSG = $(shell printf '...%30s: %s' $(1) $(2))
165endef
166
167#
168# generates feature value assignment for name, like:
169#   $(call feature_assign,dwarf) == feature-dwarf=1
170#
171feature_assign = feature-$(1)=$(feature-$(1))
172
173FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
174FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
175
176feature_dump_check = $(eval $(feature_dump_check_code))
177define feature_dump_check_code
178  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
179    $(2) := 1
180  endif
181endef
182
183#
184# First check if any test from FEATURE_DISPLAY
185# and set feature_display := 1 if it does
186$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
187
188#
189# Now also check if any other test changed,
190# so we force FEATURE-DUMP generation
191$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
192
193# The $(feature_display) controls the default detection message
194# output. It's set if:
195# - detected features differes from stored features from
196#   last build (in $(FEATURE_DUMP_FILENAME) file)
197# - one of the $(FEATURE_DISPLAY) is not detected
198# - VF is enabled
199
200ifeq ($(feature_dump_changed),1)
201  $(shell rm -f $(FEATURE_DUMP_FILENAME))
202  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
203endif
204
205feature_display_check = $(eval $(feature_check_display_code))
206define feature_check_display_code
207  ifneq ($(feature-$(1)), 1)
208    feature_display := 1
209  endif
210endef
211
212$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
213
214ifeq ($(VF),1)
215  feature_display := 1
216  feature_verbose := 1
217endif
218
219ifeq ($(feature_display),1)
220  $(info )
221  $(info Auto-detecting system features:)
222  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
223  ifneq ($(feature_verbose),1)
224    $(info )
225  endif
226endif
227
228ifeq ($(feature_verbose),1)
229  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
230  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
231  $(info )
232endif
233