xref: /aosp_15_r20/external/bpftool/src/Makefile.feature (revision 858ea5e570667251cdc31d3fe7b846b591105938) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2
3pound := \#
4
5CFLAGS_BACKUP := $(CFLAGS)
6CFLAGS := $(EXTRA_CFLAGS)
7ifneq ($(LLVM),)
8  CFLAGS += -Wno-unused-command-line-argument
9endif
10
11ifeq ($(V),1)
12  LOG=$(warning $(1))
13  LOG_RES = (echo $(1) && >&2 echo result: $(1))
14  define detect
15    $(warning $(1) && $(call LOG_RES,1) || $(call LOG_RES,0))
16    $(shell $(1) && $(call LOG_RES,1) || $(call LOG_RES,0))
17  endef
18else
19  LOG=
20  LOG_RES = (echo $(1))
21  define detect
22    $(shell $(1) 2>&1 && $(call LOG_RES,1) || $(call LOG_RES,0))
23  endef
24  QUIET_STDERR := 2>/dev/null
25endif
26
27### feature-clang-bpf-co-re
28
29CLANG_BPF_CO_RE_PROBE_CMD = \
30  printf '%s\n' 'struct s { int i; } __attribute__((preserve_access_index)); struct s foo = {};' | \
31    $(CLANG) -g -target bpf -S -o - -x c - $(QUIET_STDERR) | grep -q BTF_KIND_VAR
32
33ifneq ($(findstring clang-bpf-co-re,$(FEATURE_TESTS)),)
34$(call LOG,Probing: feature-clang-bpf-co-re)
35feature-clang-bpf-co-re := \
36  $(findstring 1,$(call detect,$(CLANG_BPF_CO_RE_PROBE_CMD)))
37endif # clang-bpf-co-re
38
39### feature-libbfd
40
41ifneq ($(findstring libbfd,$(FEATURE_TESTS)),)
42LIBBFD_PROBE := '$(pound)include <bfd.h>\n'
43LIBBFD_PROBE += 'int main(void) {'
44LIBBFD_PROBE += '	bfd_demangle(0, 0, 0);'
45LIBBFD_PROBE += '	return 0;'
46LIBBFD_PROBE += '}'
47LIBBFD_PROBE_CMD = printf '%b\n' $(LIBBFD_PROBE) | \
48  $(CC) $(CFLAGS) -Wall -Werror -x c - $(1) -o /dev/null >/dev/null
49
50define libbfd_build
51  $(call detect,$(LIBBFD_PROBE_CMD))
52endef
53
54$(call LOG,Probing: feature-libbfd)
55feature-libbfd := \
56  $(findstring 1,$(call libbfd_build,-lbfd -ldl))
57ifneq ($(feature-libbfd),1)
58  $(call LOG,Probing: feature-libbfd-liberty)
59  feature-libbfd-liberty := \
60    $(findstring 1,$(call libbfd_build,-lbfd -ldl -liberty))
61  ifneq ($(feature-libbfd-liberty),1)
62    $(call LOG,Probing: feature-libbfd-liberty-z)
63    feature-libbfd-liberty-z := \
64      $(findstring 1,$(call libbfd_build,-lbfd -ldl -liberty -lz))
65  endif
66endif
67HAS_LIBBFD := $(findstring 1, \
68  $(feature-libbfd)$(feature-libbfd-liberty)$(feature-libbfd-liberty-z))
69endif # libbfd
70
71### feature-disassembler-four-args
72
73ifneq ($(findstring disassembler-four-args,$(FEATURE_TESTS)),)
74DISASSEMBLER_PROBE := '$(pound)include <dis-asm.h>\n'
75DISASSEMBLER_PROBE += 'int main(void) {'
76DISASSEMBLER_PROBE += '	disassembler((enum bfd_architecture)0, 0, 0, NULL);'
77DISASSEMBLER_PROBE += '	return 0;'
78DISASSEMBLER_PROBE += '}'
79
80DISASSEMBLER_PROBE_CMD = printf '%b\n' $(1) | \
81  $(CC) $(CFLAGS) -Wall -Werror -x c - -lbfd -lopcodes -S -o - >/dev/null
82define disassembler_build
83  $(call detect,$(DISASSEMBLER_PROBE_CMD))
84endef
85
86$(call LOG,Probing: feature-disassembler-four-args)
87feature-disassembler-four-args := \
88    $(findstring 1, $(call disassembler_build,$(DISASSEMBLER_PROBE)))
89endif # disassembler-four-args
90
91### feature-disassembler-init-styled
92
93ifneq ($(findstring disassembler-init-styled,$(FEATURE_TESTS)),)
94DISASSEMBLER_STYLED_PROBE := '$(pound)include <dis-asm.h>\n'
95DISASSEMBLER_STYLED_PROBE += 'int main(void) {'
96DISASSEMBLER_STYLED_PROBE += '	init_disassemble_info(NULL, 0, NULL, NULL);'
97DISASSEMBLER_STYLED_PROBE += '	return 0;'
98DISASSEMBLER_STYLED_PROBE += '}'
99
100$(call LOG,Probing: feature-disassembler-styled)
101feature-disassembler-init-styled := \
102    $(findstring 1, $(call disassembler_build,$(DISASSEMBLER_STYLED_PROBE)))
103endif # disassembler-init-styled
104
105### feature-libcap
106
107ifneq ($(findstring libcap,$(FEATURE_TESTS)),)
108LIBCAP_PROBE := '$(pound)include <sys/capability.h>\n'
109LIBCAP_PROBE += 'int main(void) {'
110LIBCAP_PROBE += '	cap_free(0);'
111LIBCAP_PROBE += '	return 0;'
112LIBCAP_PROBE += '}'
113LIBCAP_PROBE_CMD = printf '%b\n' $(LIBCAP_PROBE) | \
114  $(CC) $(CFLAGS) -Wall -Werror -x c - -lcap -S -o - >/dev/null
115
116define libcap_build
117  $(call detect,$(LIBCAP_PROBE_CMD))
118endef
119
120$(call LOG,Probing: feature-libcap)
121feature-libcap := $(findstring 1, $(call libcap_build))
122endif # libcap
123
124### feature-llvm
125
126ifneq ($(findstring llvm,$(FEATURE_TESTS)),)
127LLVM_PROBE := '$(pound)include <llvm-c/Core.h>\n'
128LLVM_PROBE += '$(pound)include <llvm-c/TargetMachine.h>\n'
129LLVM_PROBE += 'int main(void) {'
130LLVM_PROBE += '	char *triple = LLVMNormalizeTargetTriple("");'
131LLVM_PROBE += '	LLVMDisposeMessage(triple);'
132LLVM_PROBE += '	return 0;'
133LLVM_PROBE += '}'
134
135# We need some adjustments for the flags.
136# - $(CFLAGS) was set to parent $(EXTRA_CFLAGS) at the beginning of this file.
137# - $(EXTRA_LDFLAGS) from parent Makefile should be kept as well.
138# - Libraries to use depend on whether we have a static or shared version of
139#   LLVM, pass the llvm-config flag and adjust the list of libraries
140#   accordingly.
141FEATURE_LLVM_CFLAGS := $(CFLAGS) $(shell $(LLVM_CONFIG) --cflags 2>/dev/null)
142FEATURE_LLVM_LIBS := $(shell $(LLVM_CONFIG) --libs target 2>/dev/null)
143ifeq ($(shell $(LLVM_CONFIG) --shared-mode 2>/dev/null),static)
144  FEATURE_LLVM_LIBS += $(shell $(LLVM_CONFIG) --system-libs target 2>/dev/null)
145  FEATURE_LLVM_LIBS += -lstdc++
146endif
147FEATURE_LDFLAGS := $(EXTRA_LDFLAGS) $(shell $(LLVM_CONFIG) --ldflags 2>/dev/null)
148
149LLVM_PROBE_CMD = printf '%b\n' $(LLVM_PROBE) | \
150  $(CC) $(FEATURE_LLVM_CFLAGS) $(FEATURE_LDFLAGS) \
151    -Wall -Werror -x c - $(FEATURE_LLVM_LIBS) \
152    -o /dev/null >/dev/null
153
154define llvm_build
155  $(call detect,$(LLVM_PROBE_CMD))
156endef
157
158$(call LOG,Probing: feature-llvm)
159feature-llvm := $(findstring 1, $(call llvm_build))
160endif # llvm
161
162### Print detection results
163
164define print_status
165  ifeq ($(1), 1)
166    MSG = $(shell printf '...%30s: [ \033[32mon\033[m  ]' $(2))
167  else
168    MSG = $(shell printf '...%30s: [ \033[31mOFF\033[m ]' $(2))
169  endif
170endef
171feature_print_status = $(eval $(print_status)) $(info $(MSG))
172
173$(call feature_print_status,$(HAS_LIBBFD),libbfd)
174
175$(foreach feature,$(filter-out libbfd%,$(FEATURE_DISPLAY)), \
176  $(call feature_print_status,$(feature-$(feature)),$(feature)))
177
178CFLAGS := $(CFLAGS_BACKUP)
179undefine LOG LOG_RES
180