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))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C $(feature_dir) 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 ?=			\
31	backtrace			\
32	dwarf				\
33	fortify-source			\
34	sync-compare-and-swap		\
35	glibc				\
36	gtk2				\
37	gtk2-infobar			\
38	libaudit			\
39	libbfd				\
40	libelf				\
41	libelf-getphdrnum		\
42	libelf-mmap			\
43	libnuma				\
44	numa_num_possible_cpus		\
45	libperl				\
46	libpython			\
47	libpython-version		\
48	libslang			\
49	libunwind			\
50	pthread-attr-setaffinity-np	\
51	stackprotector-all		\
52	timerfd				\
53	libdw-dwarf-unwind		\
54	zlib				\
55	lzma				\
56	get_cpuid			\
57	bpf
58
59FEATURE_DISPLAY ?=			\
60	dwarf				\
61	glibc				\
62	gtk2				\
63	libaudit			\
64	libbfd				\
65	libelf				\
66	libnuma				\
67	numa_num_possible_cpus		\
68	libperl				\
69	libpython			\
70	libslang			\
71	libunwind			\
72	libdw-dwarf-unwind		\
73	zlib				\
74	lzma				\
75	get_cpuid			\
76	bpf
77
78# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
79# If in the future we need per-feature checks/flags for features not
80# mentioned in this list we need to refactor this ;-).
81set_test_all_flags = $(eval $(set_test_all_flags_code))
82define set_test_all_flags_code
83  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
84  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
85endef
86
87$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
88
89#
90# Special fast-path for the 'all features are available' case:
91#
92$(call feature_check,all,$(MSG))
93
94#
95# Just in case the build freshly failed, make sure we print the
96# feature matrix:
97#
98ifeq ($(feature-all), 1)
99  #
100  # test-all.c passed - just set all the core feature flags to 1:
101  #
102  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
103else
104  $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CFLAGS="$(EXTRA_CFLAGS)" LDFLAGS=$(LDFLAGS) -i -j -C $(feature_dir) $(addsuffix .bin,$(FEATURE_TESTS)) >/dev/null 2>&1)
105  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
106endif
107
108#
109# Print the result of the feature test:
110#
111feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
112
113define feature_print_status_code
114  ifeq ($(feature-$(1)), 1)
115    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
116  else
117    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
118  endif
119endef
120
121feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
122define feature_print_text_code
123    MSG = $(shell printf '...%30s: %s' $(1) $(2))
124endef
125
126FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
127FEATURE_DUMP := $(foreach feat,$(FEATURE_DISPLAY),feature-$(feat)($(feature-$(feat))))
128FEATURE_DUMP_FILE := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
129
130ifeq ($(dwarf-post-unwind),1)
131  FEATURE_DUMP += dwarf-post-unwind($(dwarf-post-unwind-text))
132endif
133
134# The $(feature_display) controls the default detection message
135# output. It's set if:
136# - detected features differes from stored features from
137#   last build (in $(FEATURE_DUMP_FILENAME) file)
138# - one of the $(FEATURE_DISPLAY) is not detected
139# - VF is enabled
140
141ifneq ("$(FEATURE_DUMP)","$(FEATURE_DUMP_FILE)")
142  $(shell echo "$(FEATURE_DUMP)" > $(FEATURE_DUMP_FILENAME))
143  feature_display := 1
144endif
145
146feature_display_check = $(eval $(feature_check_display_code))
147define feature_display_check_code
148  ifneq ($(feature-$(1)), 1)
149    feature_display := 1
150  endif
151endef
152
153$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
154
155ifeq ($(VF),1)
156  feature_display := 1
157  feature_verbose := 1
158endif
159
160ifeq ($(feature_display),1)
161  $(info )
162  $(info Auto-detecting system features:)
163  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
164
165  ifeq ($(dwarf-post-unwind),1)
166    $(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
167  endif
168
169  ifneq ($(feature_verbose),1)
170    $(info )
171  endif
172endif
173
174ifeq ($(feature_verbose),1)
175  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
176  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
177  $(info )
178endif
179