Makefile

  1# SPDX-License-Identifier: GPL-2.0
  2include ../scripts/Makefile.include
  3include ../scripts/Makefile.arch
  4
  5ifeq ($(SRCARCH),x86)
  6	BUILD_ORC    := y
  7	ARCH_HAS_KLP := y
  8endif
  9
 10ifeq ($(SRCARCH),loongarch)
 11	BUILD_ORC	   := y
 12endif
 13
 14ifeq ($(ARCH_HAS_KLP),y)
 15	HAVE_XXHASH = $(shell printf "$(pound)include <xxhash.h>\nXXH3_state_t *state;int main() {}" | \
 16		      $(HOSTCC) $(HOSTCFLAGS) -xc - -o /dev/null -lxxhash 2> /dev/null && echo y || echo n)
 17	ifeq ($(HAVE_XXHASH),y)
 18		BUILD_KLP	 := y
 19		LIBXXHASH_CFLAGS := $(shell $(HOSTPKG_CONFIG) libxxhash --cflags 2>/dev/null) \
 20				    -DBUILD_KLP
 21		LIBXXHASH_LIBS   := $(shell $(HOSTPKG_CONFIG) libxxhash --libs 2>/dev/null || echo -lxxhash)
 22	endif
 23endif
 24
 25export BUILD_ORC BUILD_KLP
 26
 27ifeq ($(srctree),)
 28srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 29srctree := $(patsubst %/,%,$(dir $(srctree)))
 30endif
 31
 32RM ?= rm -f
 33
 34LIBSUBCMD_DIR = $(srctree)/tools/lib/subcmd/
 35ifneq ($(OUTPUT),)
 36  LIBSUBCMD_OUTPUT = $(abspath $(OUTPUT))/libsubcmd
 37else
 38  LIBSUBCMD_OUTPUT = $(CURDIR)/libsubcmd
 39endif
 40LIBSUBCMD = $(LIBSUBCMD_OUTPUT)/libsubcmd.a
 41
 42OBJTOOL    := $(OUTPUT)objtool
 43OBJTOOL_IN := $(OBJTOOL)-in.o
 44
 45LIBELF_FLAGS := $(shell $(HOSTPKG_CONFIG) libelf --cflags 2>/dev/null)
 46LIBELF_LIBS  := $(shell $(HOSTPKG_CONFIG) libelf --libs 2>/dev/null || echo -lelf)
 47
 48all: $(OBJTOOL)
 49
 50WARNINGS := -Werror -Wall -Wextra -Wmissing-prototypes			\
 51	    -Wmissing-declarations -Wwrite-strings			\
 52	    -Wno-implicit-fallthrough -Wno-sign-compare			\
 53	    -Wno-unused-parameter
 54
 55INCLUDES := -I$(srctree)/tools/include \
 56	    -I$(srctree)/tools/include/uapi \
 57	    -I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi \
 58	    -I$(srctree)/tools/arch/$(SRCARCH)/include	\
 59	    -I$(srctree)/tools/objtool/include \
 60	    -I$(srctree)/tools/objtool/arch/$(SRCARCH)/include \
 61	    -I$(LIBSUBCMD_OUTPUT)/include
 62
 63OBJTOOL_CFLAGS  := -std=gnu11 -fomit-frame-pointer -O2 -g $(WARNINGS)	\
 64		   $(INCLUDES) $(LIBELF_FLAGS) $(LIBXXHASH_CFLAGS) $(HOSTCFLAGS)
 65
 66OBJTOOL_LDFLAGS := $(LIBSUBCMD) $(LIBELF_LIBS) $(LIBXXHASH_LIBS) $(HOSTLDFLAGS)
 67
 68# Allow old libelf to be used:
 69elfshdr := $(shell echo '$(pound)include <libelf.h>' | $(HOSTCC) $(OBJTOOL_CFLAGS) -x c -E - 2>/dev/null | grep elf_getshdr)
 70OBJTOOL_CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED)
 71
 72# Always want host compilation.
 73HOST_OVERRIDES := CC="$(HOSTCC)" LD="$(HOSTLD)" AR="$(HOSTAR)"
 74
 75#
 76# To support disassembly, objtool needs libopcodes which is provided
 77# with libbfd (binutils-dev or binutils-devel package).
 78#
 79# We check using HOSTCC directly rather than the shared feature framework
 80# because objtool is a host tool that links against host libraries.
 81#
 82# When using shared libraries, -lopcodes is sufficient as dependencies are
 83# resolved automatically. With static libraries, we must explicitly link
 84# against libopcodes' dependencies: libbfd, libiberty, and sometimes libz.
 85# Try each combination and use the first one that succeeds.
 86#
 87LIBOPCODES_LIBS := $(shell \
 88	for libs in "-lopcodes" \
 89		    "-lopcodes -lbfd" \
 90		    "-lopcodes -lbfd -liberty" \
 91		    "-lopcodes -lbfd -liberty -lz"; do \
 92		echo 'extern void disassemble_init_for_target(void *);' \
 93		     'int main(void) { disassemble_init_for_target(0); return 0; }' | \
 94			$(HOSTCC) -xc - -o /dev/null $$libs 2>/dev/null && \
 95			echo "$$libs" && break; \
 96	done)
 97
 98# Styled disassembler support requires binutils >= 2.39
 99HAVE_DISASM_STYLED := $(shell echo '$(pound)include <dis-asm.h>' | \
100			$(HOSTCC) -E -xc - 2>/dev/null | grep -q disassembler_style && echo y)
101
102BUILD_DISAS := n
103
104ifneq ($(LIBOPCODES_LIBS),)
105	BUILD_DISAS := y
106	OBJTOOL_CFLAGS += -DDISAS -DPACKAGE='"objtool"'
107	OBJTOOL_LDFLAGS += $(LIBOPCODES_LIBS)
108ifeq ($(HAVE_DISASM_STYLED),y)
109	OBJTOOL_CFLAGS += -DDISASM_INIT_STYLED
110endif
111endif
112
113export BUILD_DISAS
114
115AWK = awk
116MKDIR = mkdir
117
118export srctree OUTPUT CFLAGS SRCARCH AWK
119include $(srctree)/tools/build/Makefile.include
120
121$(OBJTOOL_IN): fixdep $(LIBSUBCMD) FORCE
122	$(Q)$(CONFIG_SHELL) ./sync-check.sh
123	$(Q)$(MAKE) $(build)=objtool $(HOST_OVERRIDES) CFLAGS="$(OBJTOOL_CFLAGS)" \
124		LDFLAGS="$(OBJTOOL_LDFLAGS)"
125
126
127$(OBJTOOL): $(LIBSUBCMD) $(OBJTOOL_IN)
128	$(QUIET_LINK)$(HOSTCC) $(OBJTOOL_IN) $(OBJTOOL_LDFLAGS) -o $@
129
130
131$(LIBSUBCMD_OUTPUT):
132	$(Q)$(MKDIR) -p $@
133
134$(LIBSUBCMD): fixdep $(LIBSUBCMD_OUTPUT) FORCE
135	$(Q)$(MAKE) -C $(LIBSUBCMD_DIR) O=$(LIBSUBCMD_OUTPUT) \
136		DESTDIR=$(LIBSUBCMD_OUTPUT) prefix= subdir= \
137		$(HOST_OVERRIDES) EXTRA_CFLAGS="$(OBJTOOL_CFLAGS)" \
138		$@ install_headers
139
140$(LIBSUBCMD)-clean:
141	$(call QUIET_CLEAN, libsubcmd)
142	$(Q)$(RM) -r -- $(LIBSUBCMD_OUTPUT)
143
144clean: $(LIBSUBCMD)-clean
145	$(Q)find $(OUTPUT) \( -name '*.o' -o -name '\.*.cmd' -o -name '\.*.d' \) -type f -print | xargs $(RM)
146	$(Q)$(RM) $(OUTPUT)arch/x86/lib/cpu-feature-names.c $(OUTPUT)fixdep
147	$(Q)$(RM) $(OUTPUT)arch/x86/lib/inat-tables.c $(OUTPUT)fixdep
148	$(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.objtool
149	$(Q)$(RM) -r -- $(OUTPUT)feature
150
151mrproper: clean
152	$(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL)
153
154FORCE:
155
156.PHONY: clean mrproper FORCE