forked from Minki/linux
1e88e415eb
Modern gcc adds view assignments, reset assertion checking in .loc
directives and a couple more additional debug markers, which clutters
the asm output unnecessarily:
For example:
bsp_resume:
.LFB3466:
.loc 1 1868 1 is_stmt 1 view -0
.cfi_startproc
.loc 1 1869 2 view .LVU73
# arch/x86/kernel/cpu/common.c:1869: if (this_cpu->c_bsp_resume)
.loc 1 1869 14 is_stmt 0 view .LVU74
movq this_cpu(%rip), %rax # this_cpu, this_cpu
movq 64(%rax), %rax # this_cpu.94_1->c_bsp_resume, _2
# arch/x86/kernel/cpu/common.c:1869: if (this_cpu->c_bsp_resume)
.loc 1 1869 5 view .LVU75
testq %rax, %rax # _2
je .L8 #,
.loc 1 1870 3 is_stmt 1 view .LVU76
movq $boot_cpu_data, %rdi #,
jmp __x86_indirect_thunk_rax
or
.loc 2 57 9 view .LVU478
.loc 2 57 9 view .LVU479
.loc 2 57 9 view .LVU480
.loc 2 57 9 view .LVU481
.LBB1385:
.LBB1383:
.LBB1379:
.LBB1377:
.LBB1375:
.loc 2 57 9 view .LVU482
.loc 2 57 9 view .LVU483
movl %edi, %edx # cpu, cpu
.LVL87:
.loc 2 57 9 is_stmt 0 view .LVU484
That MOV in there is drowned in debugging information and latter makes
it hard to follow the asm. And that DWARF info is not really needed for
asm output staring.
Disable the debug information generation which clutters the asm output
unnecessarily:
bsp_resume:
# arch/x86/kernel/cpu/common.c:1869: if (this_cpu->c_bsp_resume)
movq this_cpu(%rip), %rax # this_cpu, this_cpu
movq 64(%rax), %rax # this_cpu.94_1->c_bsp_resume, _2
# arch/x86/kernel/cpu/common.c:1869: if (this_cpu->c_bsp_resume)
testq %rax, %rax # _2
je .L8 #,
# arch/x86/kernel/cpu/common.c:1870: this_cpu->c_bsp_resume(&boot_cpu_data);
movq $boot_cpu_data, %rdi #,
jmp __x86_indirect_thunk_rax
.L8:
# arch/x86/kernel/cpu/common.c:1871: }
rep ret
.size bsp_resume, .-bsp_resume
[ bp: write commit message. ]
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
521 lines
17 KiB
Makefile
521 lines
17 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ==========================================================================
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# Building
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# ==========================================================================
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src := $(obj)
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PHONY := __build
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__build:
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# Init all relevant variables used in kbuild files so
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# 1) they have correct type
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# 2) they do not inherit any value from the environment
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obj-y :=
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obj-m :=
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lib-y :=
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lib-m :=
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always :=
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targets :=
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subdir-y :=
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subdir-m :=
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EXTRA_AFLAGS :=
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EXTRA_CFLAGS :=
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EXTRA_CPPFLAGS :=
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EXTRA_LDFLAGS :=
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asflags-y :=
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ccflags-y :=
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cppflags-y :=
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ldflags-y :=
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subdir-asflags-y :=
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subdir-ccflags-y :=
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# Read auto.conf if it exists, otherwise ignore
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-include include/config/auto.conf
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include scripts/Kbuild.include
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# The filename Kbuild has precedence over Makefile
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kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
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kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
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include $(kbuild-file)
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include scripts/Makefile.lib
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# Do not include host rules unless needed
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ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
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include scripts/Makefile.host
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endif
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ifndef obj
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$(warning kbuild: Makefile.build is included improperly)
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endif
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# ===========================================================================
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ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
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lib-target := $(obj)/lib.a
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real-obj-y += $(obj)/lib-ksyms.o
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endif
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ifneq ($(strip $(real-obj-y) $(need-builtin)),)
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builtin-target := $(obj)/built-in.a
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endif
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modorder-target := $(obj)/modules.order
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# We keep a list of all modules in $(MODVERDIR)
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__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
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$(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
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$(subdir-ym) $(always)
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@:
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# Linus' kernel sanity checking tool
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ifeq ($(KBUILD_CHECKSRC),1)
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quiet_cmd_checksrc = CHECK $<
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cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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else ifeq ($(KBUILD_CHECKSRC),2)
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quiet_cmd_force_checksrc = CHECK $<
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cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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endif
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ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
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cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
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endif
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# Do section mismatch analysis for each module/built-in.a
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ifdef CONFIG_DEBUG_SECTION_MISMATCH
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cmd_secanalysis = ; scripts/mod/modpost $@
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endif
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# Compile C sources (.c)
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# ---------------------------------------------------------------------------
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# Default is built-in, unless we know otherwise
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$(foreach x, i ll lst o s symtypes, $(patsubst %.o,%.$(x),$(real-obj-m))): \
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part-of-module := y
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modkern_cflags = \
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$(if $(part-of-module), \
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$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
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$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
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quiet_modtag = $(if $(part-of-module),[M], )
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quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
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$(obj)/%.s: $(src)/%.c FORCE
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$(call if_changed_dep,cc_s_c)
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quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
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cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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$(obj)/%.i: $(src)/%.c FORCE
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$(call if_changed_dep,cpp_i_c)
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# These mirror gensymtypes_S and co below, keep them in synch.
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cmd_gensymtypes_c = \
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$(CPP) -D__GENKSYMS__ $(c_flags) $< | \
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$(GENKSYMS) $(if $(1), -T $(2)) \
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$(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
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$(if $(KBUILD_PRESERVE),-p) \
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-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
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quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_c = \
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$(call cmd_gensymtypes_c,true,$@) >/dev/null; \
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test -s $@ || rm -f $@
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$(obj)/%.symtypes : $(src)/%.c FORCE
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$(call cmd,cc_symtypes_c)
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# LLVM assembly
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# Generate .ll files from .c
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quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
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$(obj)/%.ll: $(src)/%.c FORCE
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$(call if_changed_dep,cc_ll_c)
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# C (.c) files
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# The C file is compiled and updated dependency information is generated.
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# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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ifdef CONFIG_MODVERSIONS
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# When module versioning is enabled the following steps are executed:
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# o compile a <file>.o from <file>.c
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# o if <file>.o doesn't contain a __ksymtab version, i.e. does
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# not export symbols, it's done.
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# o otherwise, we calculate symbol versions using the good old
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# genksyms on the preprocessed source and postprocess them in a way
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# that they are usable as a linker script
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# o generate .tmp_<file>.o from <file>.o using the linker to
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# replace the unresolved symbols __crc_exported_symbol with
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# the actual value of the checksum generated by genksyms
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# o remove .tmp_<file>.o to <file>.o
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cmd_modversions_c = \
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if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
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$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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> $(@D)/.tmp_$(@F:.o=.ver); \
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\
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$(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
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-T $(@D)/.tmp_$(@F:.o=.ver); \
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mv -f $(@D)/.tmp_$(@F) $@; \
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rm -f $(@D)/.tmp_$(@F:.o=.ver); \
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fi
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endif
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ifdef CONFIG_FTRACE_MCOUNT_RECORD
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ifndef CC_USING_RECORD_MCOUNT
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# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
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ifdef BUILD_C_RECORDMCOUNT
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ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
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RECORDMCOUNT_FLAGS = -w
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endif
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# Due to recursion, we must skip empty.o.
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# The empty.o file is created in the make process in order to determine
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# the target endianness and word size. It is made before all other C
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# files, including recordmcount.
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sub_cmd_record_mcount = \
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if [ $(@) != "scripts/mod/empty.o" ]; then \
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$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
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fi;
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recordmcount_source := $(srctree)/scripts/recordmcount.c \
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$(srctree)/scripts/recordmcount.h
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else
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sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
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"$(if $(CONFIG_64BIT),64,32)" \
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"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
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"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
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"$(if $(part-of-module),1,0)" "$(@)";
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recordmcount_source := $(srctree)/scripts/recordmcount.pl
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endif # BUILD_C_RECORDMCOUNT
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cmd_record_mcount = \
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if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
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"$(CC_FLAGS_FTRACE)" ]; then \
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$(sub_cmd_record_mcount) \
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fi
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endif # CC_USING_RECORD_MCOUNT
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endif # CONFIG_FTRACE_MCOUNT_RECORD
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ifdef CONFIG_STACK_VALIDATION
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ifneq ($(SKIP_STACK_VALIDATION),1)
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__objtool_obj := $(objtree)/tools/objtool/objtool
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objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
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objtool_args += $(if $(part-of-module), --module,)
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ifndef CONFIG_FRAME_POINTER
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objtool_args += --no-fp
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endif
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ifdef CONFIG_GCOV_KERNEL
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objtool_args += --no-unreachable
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endif
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ifdef CONFIG_RETPOLINE
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objtool_args += --retpoline
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endif
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# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
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cmd_objtool = $(if $(patsubst y%,, \
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$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
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$(__objtool_obj) $(objtool_args) $@)
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objtool_obj = $(if $(patsubst y%,, \
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$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
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$(__objtool_obj))
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endif # SKIP_STACK_VALIDATION
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endif # CONFIG_STACK_VALIDATION
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# Rebuild all objects when objtool changes, or is enabled/disabled.
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objtool_dep = $(objtool_obj) \
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$(wildcard include/config/orc/unwinder.h \
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include/config/stack/validation.h)
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ifdef CONFIG_TRIM_UNUSED_KSYMS
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cmd_gen_ksymdeps = \
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$(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
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endif
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define rule_cc_o_c
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$(call cmd,checksrc)
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$(call cmd_and_fixdep,cc_o_c)
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$(call cmd,gen_ksymdeps)
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$(call cmd,checkdoc)
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$(call cmd,objtool)
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$(call cmd,modversions_c)
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$(call cmd,record_mcount)
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endef
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define rule_as_o_S
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$(call cmd_and_fixdep,as_o_S)
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$(call cmd,gen_ksymdeps)
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$(call cmd,objtool)
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$(call cmd,modversions_S)
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endef
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# List module undefined symbols (or empty line if not enabled)
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ifdef CONFIG_TRIM_UNUSED_KSYMS
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cmd_undef_syms = $(NM) $@ | sed -n 's/^ *U //p' | xargs echo
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else
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cmd_undef_syms = echo
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endif
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# Built-in and composite module parts
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$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
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$(call cmd,force_checksrc)
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$(call if_changed_rule,cc_o_c)
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# Single-part modules are special since we need to mark them in $(MODVERDIR)
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$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
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$(call cmd,force_checksrc)
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$(call if_changed_rule,cc_o_c)
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@{ echo $(@:.o=.ko); echo $@; \
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$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
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quiet_cmd_cc_lst_c = MKLST $@
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cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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System.map $(OBJDUMP) > $@
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$(obj)/%.lst: $(src)/%.c FORCE
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$(call if_changed_dep,cc_lst_c)
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# Compile assembler sources (.S)
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# ---------------------------------------------------------------------------
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modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
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$(real-obj-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
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$(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
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# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
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# or a file that it includes, in order to get versioned symbols. We build a
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# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
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# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
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#
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# This is convoluted. The .S file must first be preprocessed to run guards and
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# expand names, then the resulting exports must be constructed into plain
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# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
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# to make the genksyms input.
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#
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# These mirror gensymtypes_c and co above, keep them in synch.
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cmd_gensymtypes_S = \
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{ echo "\#include <linux/kernel.h>" ; \
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echo "\#include <asm/asm-prototypes.h>" ; \
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$(CPP) $(a_flags) $< | \
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grep "\<___EXPORT_SYMBOL\>" | \
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sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
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$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
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$(GENKSYMS) $(if $(1), -T $(2)) \
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$(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
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$(if $(KBUILD_PRESERVE),-p) \
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-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
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quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_S = \
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$(call cmd_gensymtypes_S,true,$@) >/dev/null; \
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test -s $@ || rm -f $@
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$(obj)/%.symtypes : $(src)/%.S FORCE
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$(call cmd,cc_symtypes_S)
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quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
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cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
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$(obj)/%.s: $(src)/%.S FORCE
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$(call if_changed_dep,cpp_s_S)
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quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
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ifdef CONFIG_MODVERSIONS
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ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
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ifneq ($(ASM_PROTOTYPES),)
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# versioning matches the C process described above, with difference that
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# we parse asm-prototypes.h C header to get function definitions.
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cmd_modversions_S = \
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if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
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$(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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> $(@D)/.tmp_$(@F:.o=.ver); \
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\
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$(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
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-T $(@D)/.tmp_$(@F:.o=.ver); \
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mv -f $(@D)/.tmp_$(@F) $@; \
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rm -f $(@D)/.tmp_$(@F:.o=.ver); \
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fi
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endif
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endif
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$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
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$(call if_changed_rule,as_o_S)
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targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y)
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targets += $(extra-y) $(MAKECMDGOALS) $(always)
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# Linker scripts preprocessor (.lds.S -> .lds)
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# ---------------------------------------------------------------------------
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quiet_cmd_cpp_lds_S = LDS $@
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cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
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-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
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$(obj)/%.lds: $(src)/%.lds.S FORCE
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$(call if_changed_dep,cpp_lds_S)
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# ASN.1 grammar
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# ---------------------------------------------------------------------------
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quiet_cmd_asn1_compiler = ASN.1 $@
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cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
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$(subst .h,.c,$@) $(subst .c,.h,$@)
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$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
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$(call cmd,asn1_compiler)
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# Build the compiled-in targets
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# ---------------------------------------------------------------------------
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# To build objects in subdirs, we need to descend into the directories
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$(sort $(subdir-obj-y)): $(subdir-ym) ;
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#
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# Rule to compile a set of .o files into one .a file (without symbol table)
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#
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ifdef builtin-target
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quiet_cmd_ar_builtin = AR $@
|
|
cmd_ar_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(real-prereqs)
|
|
|
|
$(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 (with symbol table)
|
|
#
|
|
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) $@ $(real-prereqs)
|
|
|
|
$(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
|
|
|
|
# NOTE:
|
|
# Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
|
|
# module is turned into a multi object module, $^ will contain header file
|
|
# dependencies recorded in the .*.cmd file.
|
|
quiet_cmd_link_multi-m = LD [M] $@
|
|
cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis)
|
|
|
|
$(multi-used-m): FORCE
|
|
$(call if_changed,link_multi-m)
|
|
@{ echo $(@:.o=.ko); echo $(filter %.o,$^); \
|
|
$(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.
|
|
|
|
existing-targets := $(wildcard $(sort $(targets)))
|
|
|
|
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
|
|
|
|
ifneq ($(KBUILD_SRC),)
|
|
# Create directories for object files if they do not exist
|
|
obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
|
|
# If targets exist, their directories apparently exist. Skip mkdir.
|
|
existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
|
|
obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
|
|
ifneq ($(obj-dirs),)
|
|
$(shell mkdir -p $(obj-dirs))
|
|
endif
|
|
endif
|
|
|
|
.PHONY: $(PHONY)
|