mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 16:54:20 +08:00
113fc08357
Commitcafa0010cd("Raise the minimum required gcc version to 4.6") bumped the minimum GCC version to 4.6 for all architectures. This effectively reverts commitda541b2002("objtool: Skip unreachable warnings for GCC 4.4 and older"), which was a workaround for GCC 4.4 or older. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Michal Marek <michal.lkml@markovi.net> Cc: linux-kbuild@vger.kernel.org Link: https://lkml.kernel.org/r/1535341183-19994-1-git-send-email-yamada.masahiro@socionext.com
582 lines
19 KiB
Makefile
582 lines
19 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
# ==========================================================================
|
|
# Building
|
|
# ==========================================================================
|
|
|
|
src := $(obj)
|
|
|
|
PHONY := __build
|
|
__build:
|
|
|
|
# Init all relevant variables used in kbuild files so
|
|
# 1) they have correct type
|
|
# 2) they do not inherit any value from the environment
|
|
obj-y :=
|
|
obj-m :=
|
|
lib-y :=
|
|
lib-m :=
|
|
always :=
|
|
targets :=
|
|
subdir-y :=
|
|
subdir-m :=
|
|
EXTRA_AFLAGS :=
|
|
EXTRA_CFLAGS :=
|
|
EXTRA_CPPFLAGS :=
|
|
EXTRA_LDFLAGS :=
|
|
asflags-y :=
|
|
ccflags-y :=
|
|
cppflags-y :=
|
|
ldflags-y :=
|
|
|
|
subdir-asflags-y :=
|
|
subdir-ccflags-y :=
|
|
|
|
# Read auto.conf if it exists, otherwise ignore
|
|
-include include/config/auto.conf
|
|
|
|
include scripts/Kbuild.include
|
|
|
|
# For backward compatibility check that these variables do not change
|
|
save-cflags := $(CFLAGS)
|
|
|
|
# The filename Kbuild has precedence over Makefile
|
|
kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
|
|
kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
|
|
include $(kbuild-file)
|
|
|
|
# If the save-* variables changed error out
|
|
ifeq ($(KBUILD_NOPEDANTIC),)
|
|
ifneq ("$(save-cflags)","$(CFLAGS)")
|
|
$(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
|
|
endif
|
|
endif
|
|
|
|
include scripts/Makefile.lib
|
|
|
|
# Do not include host rules unless needed
|
|
ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
|
|
include scripts/Makefile.host
|
|
endif
|
|
|
|
ifndef obj
|
|
$(warning kbuild: Makefile.build is included improperly)
|
|
endif
|
|
|
|
# ===========================================================================
|
|
|
|
ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
|
|
lib-target := $(obj)/lib.a
|
|
real-obj-y += $(obj)/lib-ksyms.o
|
|
endif
|
|
|
|
ifneq ($(strip $(real-obj-y) $(need-builtin)),)
|
|
builtin-target := $(obj)/built-in.a
|
|
endif
|
|
|
|
modorder-target := $(obj)/modules.order
|
|
|
|
# We keep a list of all modules in $(MODVERDIR)
|
|
|
|
__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
|
|
$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
|
|
$(subdir-ym) $(always)
|
|
@:
|
|
|
|
# Linus' kernel sanity checking tool
|
|
ifneq ($(KBUILD_CHECKSRC),0)
|
|
ifeq ($(KBUILD_CHECKSRC),2)
|
|
quiet_cmd_force_checksrc = CHECK $<
|
|
cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
|
|
else
|
|
quiet_cmd_checksrc = CHECK $<
|
|
cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
|
|
endif
|
|
endif
|
|
|
|
ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
|
|
cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ;
|
|
endif
|
|
|
|
# Do section mismatch analysis for each module/built-in.a
|
|
ifdef CONFIG_DEBUG_SECTION_MISMATCH
|
|
cmd_secanalysis = ; scripts/mod/modpost $@
|
|
endif
|
|
|
|
# Compile C sources (.c)
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# Default is built-in, unless we know otherwise
|
|
modkern_cflags = \
|
|
$(if $(part-of-module), \
|
|
$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
|
|
$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
|
|
quiet_modtag := $(empty) $(empty)
|
|
|
|
$(real-obj-m) : part-of-module := y
|
|
$(real-obj-m:.o=.i) : part-of-module := y
|
|
$(real-obj-m:.o=.s) : part-of-module := y
|
|
$(real-obj-m:.o=.lst): part-of-module := y
|
|
|
|
$(real-obj-m) : quiet_modtag := [M]
|
|
$(real-obj-m:.o=.i) : quiet_modtag := [M]
|
|
$(real-obj-m:.o=.s) : quiet_modtag := [M]
|
|
$(real-obj-m:.o=.lst): quiet_modtag := [M]
|
|
|
|
$(obj-m) : quiet_modtag := [M]
|
|
|
|
quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
|
|
cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
|
|
|
|
$(obj)/%.s: $(src)/%.c FORCE
|
|
$(call if_changed_dep,cc_s_c)
|
|
|
|
quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
|
|
cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
|
|
|
|
$(obj)/%.i: $(src)/%.c FORCE
|
|
$(call if_changed_dep,cpp_i_c)
|
|
|
|
# These mirror gensymtypes_S and co below, keep them in synch.
|
|
cmd_gensymtypes_c = \
|
|
$(CPP) -D__GENKSYMS__ $(c_flags) $< | \
|
|
$(GENKSYMS) $(if $(1), -T $(2)) \
|
|
$(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
|
|
$(if $(KBUILD_PRESERVE),-p) \
|
|
-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
|
|
|
|
quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
|
|
cmd_cc_symtypes_c = \
|
|
set -e; \
|
|
$(call cmd_gensymtypes_c,true,$@) >/dev/null; \
|
|
test -s $@ || rm -f $@
|
|
|
|
$(obj)/%.symtypes : $(src)/%.c FORCE
|
|
$(call cmd,cc_symtypes_c)
|
|
|
|
# LLVM assembly
|
|
# Generate .ll files from .c
|
|
quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
|
|
cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
|
|
|
|
$(obj)/%.ll: $(src)/%.c FORCE
|
|
$(call if_changed_dep,cc_ll_c)
|
|
|
|
# C (.c) files
|
|
# The C file is compiled and updated dependency information is generated.
|
|
# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
|
|
|
|
quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
|
|
|
|
ifndef CONFIG_MODVERSIONS
|
|
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
|
|
|
|
else
|
|
# When module versioning is enabled the following steps are executed:
|
|
# o compile a .tmp_<file>.o from <file>.c
|
|
# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
|
|
# not export symbols, we just rename .tmp_<file>.o to <file>.o and
|
|
# are done.
|
|
# o otherwise, we calculate symbol versions using the good old
|
|
# genksyms on the preprocessed source and postprocess them in a way
|
|
# that they are usable as a linker script
|
|
# o generate <file>.o from .tmp_<file>.o using the linker to
|
|
# replace the unresolved symbols __crc_exported_symbol with
|
|
# the actual value of the checksum generated by genksyms
|
|
|
|
cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
|
|
|
|
cmd_modversions_c = \
|
|
if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
|
|
$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
|
> $(@D)/.tmp_$(@F:.o=.ver); \
|
|
\
|
|
$(LD) $(KBUILD_LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
|
|
-T $(@D)/.tmp_$(@F:.o=.ver); \
|
|
rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
|
|
else \
|
|
mv -f $(@D)/.tmp_$(@F) $@; \
|
|
fi;
|
|
endif
|
|
|
|
ifdef CONFIG_FTRACE_MCOUNT_RECORD
|
|
ifndef CC_USING_RECORD_MCOUNT
|
|
# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
|
|
ifdef BUILD_C_RECORDMCOUNT
|
|
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
|
|
RECORDMCOUNT_FLAGS = -w
|
|
endif
|
|
# Due to recursion, we must skip empty.o.
|
|
# The empty.o file is created in the make process in order to determine
|
|
# the target endianness and word size. It is made before all other C
|
|
# files, including recordmcount.
|
|
sub_cmd_record_mcount = \
|
|
if [ $(@) != "scripts/mod/empty.o" ]; then \
|
|
$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
|
|
fi;
|
|
recordmcount_source := $(srctree)/scripts/recordmcount.c \
|
|
$(srctree)/scripts/recordmcount.h
|
|
else
|
|
sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
|
|
"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
|
|
"$(if $(CONFIG_64BIT),64,32)" \
|
|
"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
|
|
"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
|
|
"$(if $(part-of-module),1,0)" "$(@)";
|
|
recordmcount_source := $(srctree)/scripts/recordmcount.pl
|
|
endif # BUILD_C_RECORDMCOUNT
|
|
cmd_record_mcount = \
|
|
if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
|
|
"$(CC_FLAGS_FTRACE)" ]; then \
|
|
$(sub_cmd_record_mcount) \
|
|
fi;
|
|
endif # CC_USING_RECORD_MCOUNT
|
|
endif # CONFIG_FTRACE_MCOUNT_RECORD
|
|
|
|
ifdef CONFIG_STACK_VALIDATION
|
|
ifneq ($(SKIP_STACK_VALIDATION),1)
|
|
|
|
__objtool_obj := $(objtree)/tools/objtool/objtool
|
|
|
|
objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
|
|
|
|
objtool_args += $(if $(part-of-module), --module,)
|
|
|
|
ifndef CONFIG_FRAME_POINTER
|
|
objtool_args += --no-fp
|
|
endif
|
|
ifdef CONFIG_GCOV_KERNEL
|
|
objtool_args += --no-unreachable
|
|
endif
|
|
ifdef CONFIG_RETPOLINE
|
|
ifneq ($(RETPOLINE_CFLAGS),)
|
|
objtool_args += --retpoline
|
|
endif
|
|
endif
|
|
|
|
|
|
ifdef CONFIG_MODVERSIONS
|
|
objtool_o = $(@D)/.tmp_$(@F)
|
|
else
|
|
objtool_o = $(@)
|
|
endif
|
|
|
|
# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
|
|
# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
|
|
# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
|
|
cmd_objtool = $(if $(patsubst y%,, \
|
|
$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
|
|
$(__objtool_obj) $(objtool_args) "$(objtool_o)";)
|
|
objtool_obj = $(if $(patsubst y%,, \
|
|
$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
|
|
$(__objtool_obj))
|
|
|
|
endif # SKIP_STACK_VALIDATION
|
|
endif # CONFIG_STACK_VALIDATION
|
|
|
|
# Rebuild all objects when objtool changes, or is enabled/disabled.
|
|
objtool_dep = $(objtool_obj) \
|
|
$(wildcard include/config/orc/unwinder.h \
|
|
include/config/stack/validation.h)
|
|
|
|
define rule_cc_o_c
|
|
$(call echo-cmd,checksrc) $(cmd_checksrc) \
|
|
$(call cmd_and_fixdep,cc_o_c) \
|
|
$(cmd_checkdoc) \
|
|
$(call echo-cmd,objtool) $(cmd_objtool) \
|
|
$(cmd_modversions_c) \
|
|
$(call echo-cmd,record_mcount) $(cmd_record_mcount)
|
|
endef
|
|
|
|
define rule_as_o_S
|
|
$(call cmd_and_fixdep,as_o_S) \
|
|
$(call echo-cmd,objtool) $(cmd_objtool) \
|
|
$(cmd_modversions_S)
|
|
endef
|
|
|
|
# List module undefined symbols (or empty line if not enabled)
|
|
ifdef CONFIG_TRIM_UNUSED_KSYMS
|
|
cmd_undef_syms = $(NM) $@ | sed -n 's/^ *U //p' | xargs echo
|
|
else
|
|
cmd_undef_syms = echo
|
|
endif
|
|
|
|
# Built-in and composite module parts
|
|
$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
|
|
$(call cmd,force_checksrc)
|
|
$(call if_changed_rule,cc_o_c)
|
|
|
|
# Single-part modules are special since we need to mark them in $(MODVERDIR)
|
|
|
|
$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
|
|
$(call cmd,force_checksrc)
|
|
$(call if_changed_rule,cc_o_c)
|
|
@{ echo $(@:.o=.ko); echo $@; \
|
|
$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
|
|
|
|
quiet_cmd_cc_lst_c = MKLST $@
|
|
cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
|
|
$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
|
|
System.map $(OBJDUMP) > $@
|
|
|
|
$(obj)/%.lst: $(src)/%.c FORCE
|
|
$(call if_changed_dep,cc_lst_c)
|
|
|
|
# Compile assembler sources (.S)
|
|
# ---------------------------------------------------------------------------
|
|
|
|
modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
|
|
|
|
$(real-obj-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
|
|
$(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
|
|
|
|
# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
|
|
# or a file that it includes, in order to get versioned symbols. We build a
|
|
# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
|
|
# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
|
|
#
|
|
# This is convoluted. The .S file must first be preprocessed to run guards and
|
|
# expand names, then the resulting exports must be constructed into plain
|
|
# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
|
|
# to make the genksyms input.
|
|
#
|
|
# These mirror gensymtypes_c and co above, keep them in synch.
|
|
cmd_gensymtypes_S = \
|
|
(echo "\#include <linux/kernel.h>" ; \
|
|
echo "\#include <asm/asm-prototypes.h>" ; \
|
|
$(CPP) $(a_flags) $< | \
|
|
grep "\<___EXPORT_SYMBOL\>" | \
|
|
sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
|
|
$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
|
|
$(GENKSYMS) $(if $(1), -T $(2)) \
|
|
$(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
|
|
$(if $(KBUILD_PRESERVE),-p) \
|
|
-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
|
|
|
|
quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
|
|
cmd_cc_symtypes_S = \
|
|
set -e; \
|
|
$(call cmd_gensymtypes_S,true,$@) >/dev/null; \
|
|
test -s $@ || rm -f $@
|
|
|
|
$(obj)/%.symtypes : $(src)/%.S FORCE
|
|
$(call cmd,cc_symtypes_S)
|
|
|
|
|
|
quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
|
|
cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
|
|
|
|
$(obj)/%.s: $(src)/%.S FORCE
|
|
$(call if_changed_dep,cpp_s_S)
|
|
|
|
quiet_cmd_as_o_S = AS $(quiet_modtag) $@
|
|
|
|
ifndef CONFIG_MODVERSIONS
|
|
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
|
|
|
|
else
|
|
|
|
ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
|
|
|
|
ifeq ($(ASM_PROTOTYPES),)
|
|
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
|
|
|
|
else
|
|
|
|
# versioning matches the C process described above, with difference that
|
|
# we parse asm-prototypes.h C header to get function definitions.
|
|
|
|
cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
|
|
|
|
cmd_modversions_S = \
|
|
if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
|
|
$(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
|
|
> $(@D)/.tmp_$(@F:.o=.ver); \
|
|
\
|
|
$(LD) $(KBUILD_LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
|
|
-T $(@D)/.tmp_$(@F:.o=.ver); \
|
|
rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
|
|
else \
|
|
mv -f $(@D)/.tmp_$(@F) $@; \
|
|
fi;
|
|
endif
|
|
endif
|
|
|
|
$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
|
|
$(call if_changed_rule,as_o_S)
|
|
|
|
targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y)
|
|
targets += $(extra-y) $(MAKECMDGOALS) $(always)
|
|
|
|
# Linker scripts preprocessor (.lds.S -> .lds)
|
|
# ---------------------------------------------------------------------------
|
|
quiet_cmd_cpp_lds_S = LDS $@
|
|
cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
|
|
-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
|
|
|
|
$(obj)/%.lds: $(src)/%.lds.S FORCE
|
|
$(call if_changed_dep,cpp_lds_S)
|
|
|
|
# ASN.1 grammar
|
|
# ---------------------------------------------------------------------------
|
|
quiet_cmd_asn1_compiler = ASN.1 $@
|
|
cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
|
|
$(subst .h,.c,$@) $(subst .c,.h,$@)
|
|
|
|
$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
|
|
$(call cmd,asn1_compiler)
|
|
|
|
# Build the compiled-in targets
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# To build objects in subdirs, we need to descend into the directories
|
|
$(sort $(subdir-obj-y)): $(subdir-ym) ;
|
|
|
|
#
|
|
# Rule to compile a set of .o files into one .o file
|
|
#
|
|
ifdef builtin-target
|
|
|
|
# built-in.a archives are made with no symbol table or index which
|
|
# makes them small and fast, but unable to be used by the linker.
|
|
# scripts/link-vmlinux.sh builds an aggregate built-in.a with a symbol
|
|
# table and index.
|
|
quiet_cmd_ar_builtin = AR $@
|
|
cmd_ar_builtin = rm -f $@; \
|
|
$(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(filter $(real-obj-y), $^)
|
|
|
|
$(builtin-target): $(real-obj-y) FORCE
|
|
$(call if_changed,ar_builtin)
|
|
|
|
targets += $(builtin-target)
|
|
endif # builtin-target
|
|
|
|
#
|
|
# Rule to create modules.order file
|
|
#
|
|
# Create commands to either record .ko file or cat modules.order from
|
|
# a subdirectory
|
|
modorder-cmds = \
|
|
$(foreach m, $(modorder), \
|
|
$(if $(filter %/modules.order, $m), \
|
|
cat $m;, echo kernel/$m;))
|
|
|
|
$(modorder-target): $(subdir-ym) FORCE
|
|
$(Q)(cat /dev/null; $(modorder-cmds)) > $@
|
|
|
|
#
|
|
# Rule to compile a set of .o files into one .a file
|
|
#
|
|
ifdef lib-target
|
|
quiet_cmd_link_l_target = AR $@
|
|
|
|
# lib target archives do get a symbol table and index
|
|
cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
|
|
|
|
$(lib-target): $(lib-y) FORCE
|
|
$(call if_changed,link_l_target)
|
|
|
|
targets += $(lib-target)
|
|
|
|
dummy-object = $(obj)/.lib_exports.o
|
|
ksyms-lds = $(dot-target).lds
|
|
|
|
quiet_cmd_export_list = EXPORTS $@
|
|
cmd_export_list = $(OBJDUMP) -h $< | \
|
|
sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\
|
|
rm -f $(dummy-object);\
|
|
echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
|
|
$(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
|
|
rm $(dummy-object) $(ksyms-lds)
|
|
|
|
$(obj)/lib-ksyms.o: $(lib-target) FORCE
|
|
$(call if_changed,export_list)
|
|
|
|
targets += $(obj)/lib-ksyms.o
|
|
|
|
endif
|
|
|
|
#
|
|
# Rule to link composite objects
|
|
#
|
|
# Composite objects are specified in kbuild makefile as follows:
|
|
# <composite-object>-objs := <list of .o files>
|
|
# or
|
|
# <composite-object>-y := <list of .o files>
|
|
# or
|
|
# <composite-object>-m := <list of .o files>
|
|
# The -m syntax only works if <composite object> is a module
|
|
link_multi_deps = \
|
|
$(filter $(addprefix $(obj)/, \
|
|
$($(subst $(obj)/,,$(@:.o=-objs))) \
|
|
$($(subst $(obj)/,,$(@:.o=-y))) \
|
|
$($(subst $(obj)/,,$(@:.o=-m)))), $^)
|
|
|
|
quiet_cmd_link_multi-m = LD [M] $@
|
|
cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
|
|
|
|
$(multi-used-m): FORCE
|
|
$(call if_changed,link_multi-m)
|
|
@{ echo $(@:.o=.ko); echo $(link_multi_deps); \
|
|
$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
|
|
$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
|
|
|
|
targets += $(multi-used-m)
|
|
targets := $(filter-out $(PHONY), $(targets))
|
|
|
|
# Add intermediate targets:
|
|
# When building objects with specific suffix patterns, add intermediate
|
|
# targets that the final targets are derived from.
|
|
intermediate_targets = $(foreach sfx, $(2), \
|
|
$(patsubst %$(strip $(1)),%$(sfx), \
|
|
$(filter %$(strip $(1)), $(targets))))
|
|
# %.asn1.o <- %.asn1.[ch] <- %.asn1
|
|
# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
|
|
# %.lex.o <- %.lex.c <- %.l
|
|
# %.tab.o <- %.tab.[ch] <- %.y
|
|
targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
|
|
$(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
|
|
$(call intermediate_targets, .lex.o, .lex.c) \
|
|
$(call intermediate_targets, .tab.o, .tab.c .tab.h)
|
|
|
|
# Descending
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += $(subdir-ym)
|
|
$(subdir-ym):
|
|
$(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1)
|
|
|
|
# Add FORCE to the prequisites of a target to force it to be always rebuilt.
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += FORCE
|
|
|
|
FORCE:
|
|
|
|
# Read all saved command lines and dependencies for the $(targets) we
|
|
# may be building above, using $(if_changed{,_dep}). As an
|
|
# optimization, we don't need to read them if the target does not
|
|
# exist, we will rebuild anyway in that case.
|
|
|
|
cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
|
|
|
|
ifneq ($(cmd_files),)
|
|
include $(cmd_files)
|
|
endif
|
|
|
|
ifneq ($(KBUILD_SRC),)
|
|
# Create directories for object files if they do not exist
|
|
obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
|
|
# If cmd_files exist, their directories apparently exist. Skip mkdir.
|
|
exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files))))
|
|
obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs)))
|
|
ifneq ($(obj-dirs),)
|
|
$(shell mkdir -p $(obj-dirs))
|
|
endif
|
|
endif
|
|
|
|
# Some files contained in $(targets) are intermediate artifacts.
|
|
# We never want them to be removed automatically.
|
|
.SECONDARY: $(targets)
|
|
|
|
.PHONY: $(PHONY)
|