xref: /linux/tools/build/Makefile.feature (revision 739c9180) 
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        get_current_dir_name            \
38        gettid				\
39        glibc                           \
40        libbfd                          \
41        libbfd-buildid			\
42        libcap                          \
43        libelf                          \
44        libelf-getphdrnum               \
45        libelf-gelf_getnote             \
46        libelf-getshdrstrndx            \
47        libnuma                         \
48        numa_num_possible_cpus          \
49        libperl                         \
50        libpython                       \
51        libslang                        \
52        libslang-include-subdir         \
53        libtraceevent                   \
54        libtracefs                      \
55        libcrypto                       \
56        libunwind                       \
57        pthread-attr-setaffinity-np     \
58        pthread-barrier     		\
59        reallocarray                    \
60        stackprotector-all              \
61        timerfd                         \
62        libdw-dwarf-unwind              \
63        zlib                            \
64        lzma                            \
65        get_cpuid                       \
66        bpf                             \
67        sched_getcpu			\
68        sdt				\
69        setns				\
70        libaio				\
71        libzstd				\
72        disassembler-four-args		\
73        file-handle
74
75# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
76# of all feature tests
77FEATURE_TESTS_EXTRA :=                  \
78         bionic                         \
79         compile-32                     \
80         compile-x32                    \
81         cplus-demangle                 \
82         gtk2                           \
83         gtk2-infobar                   \
84         hello                          \
85         libbabeltrace                  \
86         libbfd-liberty                 \
87         libbfd-liberty-z               \
88         libopencsd                     \
89         libunwind-x86                  \
90         libunwind-x86_64               \
91         libunwind-arm                  \
92         libunwind-aarch64              \
93         libunwind-debug-frame          \
94         libunwind-debug-frame-arm      \
95         libunwind-debug-frame-aarch64  \
96         cxx                            \
97         llvm                           \
98         llvm-version                   \
99         clang                          \
100         libbpf                         \
101         libbpf-btf__load_from_kernel_by_id \
102         libbpf-bpf_prog_load           \
103         libbpf-bpf_object__next_program \
104         libbpf-bpf_object__next_map    \
105         libpfm4                        \
106         libdebuginfod			\
107         clang-bpf-co-re
108
109
110FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
111
112ifeq ($(FEATURE_TESTS),all)
113  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
114endif
115
116FEATURE_DISPLAY ?=              \
117         dwarf                  \
118         dwarf_getlocations     \
119         glibc                  \
120         libbfd                 \
121         libbfd-buildid		\
122         libcap                 \
123         libelf                 \
124         libnuma                \
125         numa_num_possible_cpus \
126         libperl                \
127         libpython              \
128         libcrypto              \
129         libunwind              \
130         libdw-dwarf-unwind     \
131         zlib                   \
132         lzma                   \
133         get_cpuid              \
134         bpf			\
135         libaio			\
136         libzstd		\
137         disassembler-four-args
138
139# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
140# If in the future we need per-feature checks/flags for features not
141# mentioned in this list we need to refactor this ;-).
142set_test_all_flags = $(eval $(set_test_all_flags_code))
143define set_test_all_flags_code
144  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
145  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
146endef
147
148$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
149
150#
151# Special fast-path for the 'all features are available' case:
152#
153$(call feature_check,all,$(MSG))
154
155#
156# Just in case the build freshly failed, make sure we print the
157# feature matrix:
158#
159ifeq ($(feature-all), 1)
160  #
161  # test-all.c passed - just set all the core feature flags to 1:
162  #
163  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
164  #
165  # test-all.c does not comprise these tests, so we need to
166  # for this case to get features proper values
167  #
168  $(call feature_check,compile-32)
169  $(call feature_check,compile-x32)
170  $(call feature_check,bionic)
171  $(call feature_check,libbabeltrace)
172else
173  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
174endif
175
176#
177# Print the result of the feature test:
178#
179feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
180
181define feature_print_status_code
182  ifeq ($(feature-$(1)), 1)
183    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
184  else
185    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
186  endif
187endef
188
189feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
190define feature_print_text_code
191    MSG = $(shell printf '...%30s: %s' $(1) $(2))
192endef
193
194#
195# generates feature value assignment for name, like:
196#   $(call feature_assign,dwarf) == feature-dwarf=1
197#
198feature_assign = feature-$(1)=$(feature-$(1))
199
200FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
201FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
202
203feature_dump_check = $(eval $(feature_dump_check_code))
204define feature_dump_check_code
205  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
206    $(2) := 1
207  endif
208endef
209
210#
211# First check if any test from FEATURE_DISPLAY
212# and set feature_display := 1 if it does
213$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
214
215#
216# Now also check if any other test changed,
217# so we force FEATURE-DUMP generation
218$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
219
220# The $(feature_display) controls the default detection message
221# output. It's set if:
222# - detected features differes from stored features from
223#   last build (in $(FEATURE_DUMP_FILENAME) file)
224# - one of the $(FEATURE_DISPLAY) is not detected
225# - VF is enabled
226
227ifeq ($(feature_dump_changed),1)
228  $(shell rm -f $(FEATURE_DUMP_FILENAME))
229  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
230endif
231
232feature_display_check = $(eval $(feature_check_display_code))
233define feature_check_display_code
234  ifneq ($(feature-$(1)), 1)
235    feature_display := 1
236  endif
237endef
238
239$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
240
241ifeq ($(VF),1)
242  feature_display := 1
243  feature_verbose := 1
244endif
245
246feature_display_entries = $(eval $(feature_display_entries_code))
247define feature_display_entries_code
248  ifeq ($(feature_display),1)
249    $(info )
250    $(info Auto-detecting system features:)
251    $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
252    ifneq ($(feature_verbose),1)
253      $(info )
254    endif
255  endif
256
257  ifeq ($(feature_verbose),1)
258    TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
259    $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
260    $(info )
261  endif
262endef
263
264ifeq ($(FEATURE_DISPLAY_DEFERRED),)
265  $(call feature_display_entries)
266endif
267