xref: /linux/tools/build/Makefile.feature (revision e5c86679d5e864947a52fb31e45a425dea3e7fa9) 
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        sdt
67
68# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
69# of all feature tests
70FEATURE_TESTS_EXTRA :=                  \
71         bionic                         \
72         compile-32                     \
73         compile-x32                    \
74         cplus-demangle                 \
75         hello                          \
76         libbabeltrace                  \
77         liberty                        \
78         liberty-z                      \
79         libunwind-debug-frame          \
80         libunwind-debug-frame-arm      \
81         libunwind-debug-frame-aarch64
82
83FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
84
85ifeq ($(FEATURE_TESTS),all)
86  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
87endif
88
89FEATURE_DISPLAY ?=              \
90         dwarf                  \
91         dwarf_getlocations     \
92         glibc                  \
93         gtk2                   \
94         libaudit               \
95         libbfd                 \
96         libelf                 \
97         libnuma                \
98         numa_num_possible_cpus \
99         libperl                \
100         libpython              \
101         libslang               \
102         libcrypto              \
103         libunwind              \
104         libdw-dwarf-unwind     \
105         zlib                   \
106         lzma                   \
107         get_cpuid              \
108         bpf
109
110# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
111# If in the future we need per-feature checks/flags for features not
112# mentioned in this list we need to refactor this ;-).
113set_test_all_flags = $(eval $(set_test_all_flags_code))
114define set_test_all_flags_code
115  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
116  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
117endef
118
119$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
120
121#
122# Special fast-path for the 'all features are available' case:
123#
124$(call feature_check,all,$(MSG))
125
126#
127# Just in case the build freshly failed, make sure we print the
128# feature matrix:
129#
130ifeq ($(feature-all), 1)
131  #
132  # test-all.c passed - just set all the core feature flags to 1:
133  #
134  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
135  #
136  # test-all.c does not comprise these tests, so we need to
137  # for this case to get features proper values
138  #
139  $(call feature_check,compile-32)
140  $(call feature_check,compile-x32)
141  $(call feature_check,bionic)
142  $(call feature_check,libbabeltrace)
143else
144  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
145endif
146
147#
148# Print the result of the feature test:
149#
150feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
151
152define feature_print_status_code
153  ifeq ($(feature-$(1)), 1)
154    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
155  else
156    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
157  endif
158endef
159
160feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
161define feature_print_text_code
162    MSG = $(shell printf '...%30s: %s' $(1) $(2))
163endef
164
165#
166# generates feature value assignment for name, like:
167#   $(call feature_assign,dwarf) == feature-dwarf=1
168#
169feature_assign = feature-$(1)=$(feature-$(1))
170
171FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
172FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
173
174feature_dump_check = $(eval $(feature_dump_check_code))
175define feature_dump_check_code
176  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
177    $(2) := 1
178  endif
179endef
180
181#
182# First check if any test from FEATURE_DISPLAY
183# and set feature_display := 1 if it does
184$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
185
186#
187# Now also check if any other test changed,
188# so we force FEATURE-DUMP generation
189$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
190
191# The $(feature_display) controls the default detection message
192# output. It's set if:
193# - detected features differes from stored features from
194#   last build (in $(FEATURE_DUMP_FILENAME) file)
195# - one of the $(FEATURE_DISPLAY) is not detected
196# - VF is enabled
197
198ifeq ($(feature_dump_changed),1)
199  $(shell rm -f $(FEATURE_DUMP_FILENAME))
200  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
201endif
202
203feature_display_check = $(eval $(feature_check_display_code))
204define feature_check_display_code
205  ifneq ($(feature-$(1)), 1)
206    feature_display := 1
207  endif
208endef
209
210$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
211
212ifeq ($(VF),1)
213  feature_display := 1
214  feature_verbose := 1
215endif
216
217ifeq ($(feature_display),1)
218  $(info )
219  $(info Auto-detecting system features:)
220  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
221  ifneq ($(feature_verbose),1)
222    $(info )
223  endif
224endif
225
226ifeq ($(feature_verbose),1)
227  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
228  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
229  $(info )
230endif
231