xref: /linux/tools/build/Makefile.feature (revision 0df2c90eba60791148cee1823c0bf5fc66e3465c) 
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) 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        gtk2                            \
42        gtk2-infobar                    \
43        libaudit                        \
44        libbfd                          \
45        libcap                          \
46        libelf                          \
47        libelf-getphdrnum               \
48        libelf-gelf_getnote             \
49        libelf-getshdrstrndx            \
50        libelf-mmap                     \
51        libnuma                         \
52        numa_num_possible_cpus          \
53        libperl                         \
54        libpython                       \
55        libpython-version               \
56        libslang                        \
57        libslang-include-subdir         \
58        libcrypto                       \
59        libunwind                       \
60        pthread-attr-setaffinity-np     \
61        pthread-barrier     		\
62        reallocarray                    \
63        stackprotector-all              \
64        timerfd                         \
65        libdw-dwarf-unwind              \
66        zlib                            \
67        lzma                            \
68        get_cpuid                       \
69        bpf                             \
70        sched_getcpu			\
71        sdt				\
72        setns				\
73        libaio				\
74        libzstd				\
75        disassembler-four-args
76
77# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
78# of all feature tests
79FEATURE_TESTS_EXTRA :=                  \
80         bionic                         \
81         compile-32                     \
82         compile-x32                    \
83         cplus-demangle                 \
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
101FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
102
103ifeq ($(FEATURE_TESTS),all)
104  FEATURE_TESTS := $(FEATURE_TESTS_BASIC) $(FEATURE_TESTS_EXTRA)
105endif
106
107FEATURE_DISPLAY ?=              \
108         dwarf                  \
109         dwarf_getlocations     \
110         glibc                  \
111         gtk2                   \
112         libaudit               \
113         libbfd                 \
114         libcap                 \
115         libelf                 \
116         libnuma                \
117         numa_num_possible_cpus \
118         libperl                \
119         libpython              \
120         libcrypto              \
121         libunwind              \
122         libdw-dwarf-unwind     \
123         zlib                   \
124         lzma                   \
125         get_cpuid              \
126         bpf			\
127         libaio			\
128         libzstd		\
129         disassembler-four-args
130
131# Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
132# If in the future we need per-feature checks/flags for features not
133# mentioned in this list we need to refactor this ;-).
134set_test_all_flags = $(eval $(set_test_all_flags_code))
135define set_test_all_flags_code
136  FEATURE_CHECK_CFLAGS-all  += $(FEATURE_CHECK_CFLAGS-$(1))
137  FEATURE_CHECK_LDFLAGS-all += $(FEATURE_CHECK_LDFLAGS-$(1))
138endef
139
140$(foreach feat,$(FEATURE_TESTS),$(call set_test_all_flags,$(feat)))
141
142#
143# Special fast-path for the 'all features are available' case:
144#
145$(call feature_check,all,$(MSG))
146
147#
148# Just in case the build freshly failed, make sure we print the
149# feature matrix:
150#
151ifeq ($(feature-all), 1)
152  #
153  # test-all.c passed - just set all the core feature flags to 1:
154  #
155  $(foreach feat,$(FEATURE_TESTS),$(call feature_set,$(feat)))
156  #
157  # test-all.c does not comprise these tests, so we need to
158  # for this case to get features proper values
159  #
160  $(call feature_check,compile-32)
161  $(call feature_check,compile-x32)
162  $(call feature_check,bionic)
163  $(call feature_check,libbabeltrace)
164else
165  $(foreach feat,$(FEATURE_TESTS),$(call feature_check,$(feat)))
166endif
167
168#
169# Print the result of the feature test:
170#
171feature_print_status = $(eval $(feature_print_status_code)) $(info $(MSG))
172
173define feature_print_status_code
174  ifeq ($(feature-$(1)), 1)
175    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(1))
176  else
177    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(1))
178  endif
179endef
180
181feature_print_text = $(eval $(feature_print_text_code)) $(info $(MSG))
182define feature_print_text_code
183    MSG = $(shell printf '...%30s: %s' $(1) $(2))
184endef
185
186#
187# generates feature value assignment for name, like:
188#   $(call feature_assign,dwarf) == feature-dwarf=1
189#
190feature_assign = feature-$(1)=$(feature-$(1))
191
192FEATURE_DUMP_FILENAME = $(OUTPUT)FEATURE-DUMP$(FEATURE_USER)
193FEATURE_DUMP := $(shell touch $(FEATURE_DUMP_FILENAME); cat $(FEATURE_DUMP_FILENAME))
194
195feature_dump_check = $(eval $(feature_dump_check_code))
196define feature_dump_check_code
197  ifeq ($(findstring $(1),$(FEATURE_DUMP)),)
198    $(2) := 1
199  endif
200endef
201
202#
203# First check if any test from FEATURE_DISPLAY
204# and set feature_display := 1 if it does
205$(foreach feat,$(FEATURE_DISPLAY),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_display))
206
207#
208# Now also check if any other test changed,
209# so we force FEATURE-DUMP generation
210$(foreach feat,$(FEATURE_TESTS),$(call feature_dump_check,$(call feature_assign,$(feat)),feature_dump_changed))
211
212# The $(feature_display) controls the default detection message
213# output. It's set if:
214# - detected features differes from stored features from
215#   last build (in $(FEATURE_DUMP_FILENAME) file)
216# - one of the $(FEATURE_DISPLAY) is not detected
217# - VF is enabled
218
219ifeq ($(feature_dump_changed),1)
220  $(shell rm -f $(FEATURE_DUMP_FILENAME))
221  $(foreach feat,$(FEATURE_TESTS),$(shell echo "$(call feature_assign,$(feat))" >> $(FEATURE_DUMP_FILENAME)))
222endif
223
224feature_display_check = $(eval $(feature_check_display_code))
225define feature_check_display_code
226  ifneq ($(feature-$(1)), 1)
227    feature_display := 1
228  endif
229endef
230
231$(foreach feat,$(FEATURE_DISPLAY),$(call feature_display_check,$(feat)))
232
233ifeq ($(VF),1)
234  feature_display := 1
235  feature_verbose := 1
236endif
237
238ifeq ($(feature_display),1)
239  $(info )
240  $(info Auto-detecting system features:)
241  $(foreach feat,$(FEATURE_DISPLAY),$(call feature_print_status,$(feat),))
242  ifneq ($(feature_verbose),1)
243    $(info )
244  endif
245endif
246
247ifeq ($(feature_verbose),1)
248  TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
249  $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
250  $(info )
251endif
252