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