xref: /linux/tools/build/Makefile.feature (revision 6e7fd890f1d6ac83805409e9c346240de2705584) 
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        dwarf_getcfi                    \
36        eventfd                         \
37        fortify-source                  \
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        libtraceevent                   \
55        libtracefs                      \
56        libcrypto                       \
57        libunwind                       \
58        pthread-attr-setaffinity-np     \
59        pthread-barrier     		\
60        reallocarray                    \
61        stackprotector-all              \
62        timerfd                         \
63        libdw-dwarf-unwind              \
64        zlib                            \
65        lzma                            \
66        get_cpuid                       \
67        bpf                             \
68        scandirat			\
69        sched_getcpu			\
70        sdt				\
71        setns				\
72        libaio				\
73        libzstd				\
74        disassembler-four-args		\
75        disassembler-init-styled	\
76        file-handle
77
78# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
79# of all feature tests
80FEATURE_TESTS_EXTRA :=                  \
81         bionic                         \
82         compile-32                     \
83         compile-x32                    \
84         cplus-demangle                 \
85         cxa-demangle                   \
86         gtk2                           \
87         gtk2-infobar                   \
88         hello                          \
89         libbabeltrace                  \
90         libcapstone                    \
91         libbfd-liberty                 \
92         libbfd-liberty-z               \
93         libopencsd                     \
94         libunwind-x86                  \
95         libunwind-x86_64               \
96         libunwind-arm                  \
97         libunwind-aarch64              \
98         libunwind-debug-frame          \
99         libunwind-debug-frame-arm      \
100         libunwind-debug-frame-aarch64  \
101         cxx                            \
102         llvm                           \
103         llvm-version                   \
104         clang                          \
105         libbpf                         \
106         libbpf-btf__load_from_kernel_by_id \
107         libbpf-bpf_prog_load           \
108         libbpf-bpf_object__next_program \
109         libbpf-bpf_object__next_map    \
110         libbpf-bpf_program__set_insns  \
111         libbpf-bpf_create_map		\
112         libpfm4                        \
113         libdebuginfod			\
114         clang-bpf-co-re
115
116
117FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
118
119ifeq ($(FEATURE_TESTS),all)
120  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
121endif
122
123FEATURE_DISPLAY ?=              \
124         dwarf                  \
125         dwarf_getlocations     \
126         glibc                  \
127         libbfd                 \
128         libbfd-buildid		\
129         libcap                 \
130         libelf                 \
131         libnuma                \
132         numa_num_possible_cpus \
133         libperl                \
134         libpython              \
135         libcrypto              \
136         libunwind              \
137         libdw-dwarf-unwind     \
138         libcapstone            \
139         zlib                   \
140         lzma                   \
141         get_cpuid              \
142         bpf			\
143         libaio			\
144         libzstd
145
146#
147# Declare group members of a feature to display the logical OR of the detection
148# result instead of each member result.
149#
150FEATURE_GROUP_MEMBERS-libbfd = libbfd-liberty libbfd-liberty-z
151
152#
153# Declare list of feature dependency packages that provide pkg-config files.
154#
155FEATURE_PKG_CONFIG ?=           \
156         libtraceevent          \
157         libtracefs
158
159feature_pkg_config = $(eval $(feature_pkg_config_code))
160define feature_pkg_config_code
161  FEATURE_CHECK_CFLAGS-$(1) := $(shell $(PKG_CONFIG) --cflags $(1) 2>/dev/null)
162  FEATURE_CHECK_LDFLAGS-$(1) := $(shell $(PKG_CONFIG) --libs $(1) 2>/dev/null)
163endef
164
165# Set FEATURE_CHECK_(C|LD)FLAGS-$(package) for packages using pkg-config.
166ifneq ($(PKG_CONFIG),)
167  $(foreach package,$(FEATURE_PKG_CONFIG),$(call feature_pkg_config,$(package)))
168endif
169
170# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
171# If in the future we need per-feature checks/flags for features not
172# mentioned in this list we need to refactor this ;-).
173set_test_all_flags = $(eval $(set_test_all_flags_code))
174define set_test_all_flags_code
175  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
176  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
177endef
178
179$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
180
181#
182# Special fast-path for the 'all features are available' case:
183#
184$(call feature_check,all,$(MSG))
185
186#
187# Just in case the build freshly failed, make sure we print the
188# feature matrix:
189#
190ifeq ($(feature-all), 1)
191  #
192  # test-all.c passed - just set all the core feature flags to 1:
193  #
194  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
195  #
196  # test-all.c does not comprise these tests, so we need to
197  # for this case to get features proper values
198  #
199  $(call feature_check,compile-32)
200  $(call feature_check,compile-x32)
201  $(call feature_check,bionic)
202  $(call feature_check,libbabeltrace)
203else
204  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
205endif
206
207#
208# Print the result of the feature test:
209#
210feature_print_status = $(eval $(feature_print_status_code))
211
212feature_group = $(eval $(feature_gen_group)) $(GROUP)
213
214define feature_gen_group
215  GROUP := $(1)
216  ifneq ($(feature_verbose),1)
217    GROUP += $(FEATURE_GROUP_MEMBERS-$(1))
218  endif
219endef
220
221define feature_print_status_code
222  ifneq (,$(filter 1,$(foreach feat,$(call feature_group,$(feat)),$(feature-$(feat)))))
223    MSG = $(shell printf '...%40s: [ \033[32mon\033[m  ]' $(1))
224  else
225    MSG = $(shell printf '...%40s: [ \033[31mOFF\033[m ]' $(1))
226  endif
227endef
228
229feature_print_text = $(eval $(feature_print_text_code))
230define feature_print_text_code
231    MSG = $(shell printf '...%40s: %s' $(1) $(2))
232endef
233
234#
235# generates feature value assignment for name, like:
236#   $(call feature_assign,dwarf) == feature-dwarf=1
237#
238feature_assign = feature-$(1)=$(feature-$(1))
239
240FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
241FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
242
243feature_dump_check = $(eval $(feature_dump_check_code))
244define feature_dump_check_code
245  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
246    $(2) := 1
247  endif
248endef
249
250#
251# First check if any test from FEATURE_DISPLAY
252# and set feature_display := 1 if it does
253$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
254
255#
256# Now also check if any other test changed,
257# so we force FEATURE-DUMP generation
258$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
259
260# The $(feature_display) controls the default detection message
261# output. It's set if:
262# - detected features differes from stored features from
263#   last build (in $(FEATURE_DUMP_FILENAME) file)
264# - one of the $(FEATURE_DISPLAY) is not detected
265# - VF is enabled
266
267ifeq ($(feature_dump_changed),1)
268  $(shell rm -f $(FEATURE_DUMP_FILENAME))
269  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
270endif
271
272feature_display_check = $(eval $(feature_check_display_code))
273define feature_check_display_code
274  ifneq ($(feature-$(1)), 1)
275    feature_display := 1
276  endif
277endef
278
279$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
280
281ifeq ($(VF),1)
282  feature_display := 1
283  feature_verbose := 1
284endif
285
286ifneq ($(feature_verbose),1)
287  #
288  # Determine the features to omit from the displayed message, as only the
289  # logical OR of the detection result will be shown.
290  #
291  FEATURE_OMIT := $(foreach feat,$(FEATURE_DISPLAY),$(FEATURE_GROUP_MEMBERS-$(feat)))
292endif
293
294feature_display_entries = $(eval $(feature_display_entries_code))
295define feature_display_entries_code
296  ifeq ($(feature_display),1)
297    $$(info )
298    $$(info Auto-detecting system features:)
299    $(foreach feat,$(filter-out $(FEATURE_OMIT),$(FEATURE_DISPLAY)),$(call feature_print_status,$(feat),) $$(info $(MSG)))
300  endif
301
302  ifeq ($(feature_verbose),1)
303    $(eval TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS)))
304    $(foreach feat,$(TMP),$(call feature_print_status,$(feat),) $$(info $(MSG)))
305  endif
306endef
307
308ifeq ($(FEATURE_DISPLAY_DEFERRED),)
309  $(call feature_display_entries)
310  $(info )
311endif
312