xref: /linux/tools/build/Makefile.feature (revision fcc8487d477a3452a1d0ccbdd4c5e0e1e3cb8bed) 
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
69# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
70# of all feature tests
71FEATURE_TESTS_EXTRA :=                  \
72         bionic                         \
73         compile-32                     \
74         compile-x32                    \
75         cplus-demangle                 \
76         hello                          \
77         libbabeltrace                  \
78         liberty                        \
79         liberty-z                      \
80         libunwind-debug-frame          \
81         libunwind-debug-frame-arm      \
82         libunwind-debug-frame-aarch64
83
84FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
85
86ifeq ($(FEATURE_TESTS),all)
87  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
88endif
89
90FEATURE_DISPLAY ?=              \
91         dwarf                  \
92         dwarf_getlocations     \
93         glibc                  \
94         gtk2                   \
95         libaudit               \
96         libbfd                 \
97         libelf                 \
98         libnuma                \
99         numa_num_possible_cpus \
100         libperl                \
101         libpython              \
102         libslang               \
103         libcrypto              \
104         libunwind              \
105         libdw-dwarf-unwind     \
106         zlib                   \
107         lzma                   \
108         get_cpuid              \
109         bpf
110
111# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
112# If in the future we need per-feature checks/flags for features not
113# mentioned in this list we need to refactor this ;-).
114set_test_all_flags = $(eval $(set_test_all_flags_code))
115define set_test_all_flags_code
116  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
117  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
118endef
119
120$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
121
122#
123# Special fast-path for the 'all features are available' case:
124#
125$(call feature_check,all,$(MSG))
126
127#
128# Just in case the build freshly failed, make sure we print the
129# feature matrix:
130#
131ifeq ($(feature-all), 1)
132  #
133  # test-all.c passed - just set all the core feature flags to 1:
134  #
135  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
136  #
137  # test-all.c does not comprise these tests, so we need to
138  # for this case to get features proper values
139  #
140  $(call feature_check,compile-32)
141  $(call feature_check,compile-x32)
142  $(call feature_check,bionic)
143  $(call feature_check,libbabeltrace)
144else
145  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
146endif
147
148#
149# Print the result of the feature test:
150#
151feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
152
153define feature_print_status_code
154  ifeq ($(feature-$(1)), 1)
155    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
156  else
157    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
158  endif
159endef
160
161feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
162define feature_print_text_code
163    MSG = $(shell printf '...%30s: %s' $(1) $(2))
164endef
165
166#
167# generates feature value assignment for name, like:
168#   $(call feature_assign,dwarf) == feature-dwarf=1
169#
170feature_assign = feature-$(1)=$(feature-$(1))
171
172FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
173FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
174
175feature_dump_check = $(eval $(feature_dump_check_code))
176define feature_dump_check_code
177  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
178    $(2) := 1
179  endif
180endef
181
182#
183# First check if any test from FEATURE_DISPLAY
184# and set feature_display := 1 if it does
185$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
186
187#
188# Now also check if any other test changed,
189# so we force FEATURE-DUMP generation
190$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
191
192# The $(feature_display) controls the default detection message
193# output. It's set if:
194# - detected features differes from stored features from
195#   last build (in $(FEATURE_DUMP_FILENAME) file)
196# - one of the $(FEATURE_DISPLAY) is not detected
197# - VF is enabled
198
199ifeq ($(feature_dump_changed),1)
200  $(shell rm -f $(FEATURE_DUMP_FILENAME))
201  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
202endif
203
204feature_display_check = $(eval $(feature_check_display_code))
205define feature_check_display_code
206  ifneq ($(feature-$(1)), 1)
207    feature_display := 1
208  endif
209endef
210
211$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
212
213ifeq ($(VF),1)
214  feature_display := 1
215  feature_verbose := 1
216endif
217
218ifeq ($(feature_display),1)
219  $(info )
220  $(info Auto-detecting system features:)
221  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
222  ifneq ($(feature_verbose),1)
223    $(info )
224  endif
225endif
226
227ifeq ($(feature_verbose),1)
228  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
229  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
230  $(info )
231endif
232