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1# SPDX-License-Identifier: GPL-2.0-only
2feature_dir := $(srctree)/tools/build/feature
3
4ifneq ($(OUTPUT),)
5  OUTPUT_FEATURES = $(OUTPUT)feature/
6  $(shell mkdir -p $(OUTPUT_FEATURES))
7endif
8
9feature_check = $(eval $(feature_check_code))
10define feature_check_code
11  feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CC="$(CC)" CXX="$(CXX)" 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)
12endef
13
14feature_set = $(eval $(feature_set_code))
15define feature_set_code
16  feature-$(1) := 1
17endef
18
19#
20# Build the feature check binaries in parallel, ignore errors, ignore return value and suppress output:
21#
22
23#
24# Note that this is not a complete list of all feature tests, just
25# those that are typically built on a fully configured system.
26#
27# [ Feature tests not mentioned here have to be built explicitly in
28#   the rule that uses them - an example for that is the 'bionic'
29#   feature check. ]
30#
31FEATURE_TESTS_BASIC :=                  \
32        backtrace                       \
33        dwarf                           \
34        dwarf_getlocations              \
35        eventfd                         \
36        fortify-source                  \
37        sync-compare-and-swap           \
38        get_current_dir_name            \
39        gettid				\
40        glibc                           \
41        libbfd                          \
42        libbfd-buildid			\
43        libcap                          \
44        libelf                          \
45        libelf-getphdrnum               \
46        libelf-gelf_getnote             \
47        libelf-getshdrstrndx            \
48        libnuma                         \
49        numa_num_possible_cpus          \
50        libperl                         \
51        libpython                       \
52        libslang                        \
53        libslang-include-subdir         \
54        libcrypto                       \
55        libunwind                       \
56        pthread-attr-setaffinity-np     \
57        pthread-barrier     		\
58        reallocarray                    \
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        libaio				\
70        libzstd				\
71        disassembler-four-args		\
72        file-handle
73
74# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
75# of all feature tests
76FEATURE_TESTS_EXTRA :=                  \
77         bionic                         \
78         compile-32                     \
79         compile-x32                    \
80         cplus-demangle                 \
81         gtk2                           \
82         gtk2-infobar                   \
83         hello                          \
84         libbabeltrace                  \
85         libbfd-liberty                 \
86         libbfd-liberty-z               \
87         libopencsd                     \
88         libunwind-x86                  \
89         libunwind-x86_64               \
90         libunwind-arm                  \
91         libunwind-aarch64              \
92         libunwind-debug-frame          \
93         libunwind-debug-frame-arm      \
94         libunwind-debug-frame-aarch64  \
95         cxx                            \
96         llvm                           \
97         llvm-version                   \
98         clang                          \
99         libbpf                         \
100         libpfm4                        \
101         libdebuginfod
102
103FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
104
105ifeq ($(FEATURE_TESTS),all)
106  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
107endif
108
109FEATURE_DISPLAY ?=              \
110         dwarf                  \
111         dwarf_getlocations     \
112         glibc                  \
113         libbfd                 \
114         libbfd-buildid		\
115         libcap                 \
116         libelf                 \
117         libnuma                \
118         numa_num_possible_cpus \
119         libperl                \
120         libpython              \
121         libcrypto              \
122         libunwind              \
123         libdw-dwarf-unwind     \
124         zlib                   \
125         lzma                   \
126         get_cpuid              \
127         bpf			\
128         libaio			\
129         libzstd		\
130         disassembler-four-args
131
132# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
133# If in the future we need per-feature checks/flags for features not
134# mentioned in this list we need to refactor this ;-).
135set_test_all_flags = $(eval $(set_test_all_flags_code))
136define set_test_all_flags_code
137  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
138  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
139endef
140
141$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
142
143#
144# Special fast-path for the 'all features are available' case:
145#
146$(call feature_check,all,$(MSG))
147
148#
149# Just in case the build freshly failed, make sure we print the
150# feature matrix:
151#
152ifeq ($(feature-all), 1)
153  #
154  # test-all.c passed - just set all the core feature flags to 1:
155  #
156  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
157  #
158  # test-all.c does not comprise these tests, so we need to
159  # for this case to get features proper values
160  #
161  $(call feature_check,compile-32)
162  $(call feature_check,compile-x32)
163  $(call feature_check,bionic)
164  $(call feature_check,libbabeltrace)
165else
166  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
167endif
168
169#
170# Print the result of the feature test:
171#
172feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
173
174define feature_print_status_code
175  ifeq ($(feature-$(1)), 1)
176    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
177  else
178    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
179  endif
180endef
181
182feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
183define feature_print_text_code
184    MSG = $(shell printf '...%30s: %s' $(1) $(2))
185endef
186
187#
188# generates feature value assignment for name, like:
189#   $(call feature_assign,dwarf) == feature-dwarf=1
190#
191feature_assign = feature-$(1)=$(feature-$(1))
192
193FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
194FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
195
196feature_dump_check = $(eval $(feature_dump_check_code))
197define feature_dump_check_code
198  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
199    $(2) := 1
200  endif
201endef
202
203#
204# First check if any test from FEATURE_DISPLAY
205# and set feature_display := 1 if it does
206$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
207
208#
209# Now also check if any other test changed,
210# so we force FEATURE-DUMP generation
211$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
212
213# The $(feature_display) controls the default detection message
214# output. It's set if:
215# - detected features differes from stored features from
216#   last build (in $(FEATURE_DUMP_FILENAME) file)
217# - one of the $(FEATURE_DISPLAY) is not detected
218# - VF is enabled
219
220ifeq ($(feature_dump_changed),1)
221  $(shell rm -f $(FEATURE_DUMP_FILENAME))
222  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
223endif
224
225feature_display_check = $(eval $(feature_check_display_code))
226define feature_check_display_code
227  ifneq ($(feature-$(1)), 1)
228    feature_display := 1
229  endif
230endef
231
232$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
233
234ifeq ($(VF),1)
235  feature_display := 1
236  feature_verbose := 1
237endif
238
239ifeq ($(feature_display),1)
240  $(info )
241  $(info Auto-detecting system features:)
242  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
243  ifneq ($(feature_verbose),1)
244    $(info )
245  endif
246endif
247
248ifeq ($(feature_verbose),1)
249  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
250  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
251  $(info )
252endif
253