kbuild: rename built-in.o to built-in.a
Incremental linking is gone, so rename built-in.o to built-in.a, which is the usual extension for archive files. This patch does two things, first is a simple search/replace: git grep -l 'built-in\.o' | xargs sed -i 's/built-in\.o/built-in\.a/g' The second is to invert nesting of nested text manipulations to avoid filtering built-in.a out from libs-y2: -libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.a, $(libs-y))) +libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Nicholas Piggin
Masahiro Yamada
parent
6358d6e8b9
commit
f49821ee32
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@ -153,18 +153,18 @@ more details, with real examples.
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configuration.
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Kbuild compiles all the $(obj-y) files. It then calls
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"$(AR) rcSTP" to merge these files into one built-in.o file.
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"$(AR) rcSTP" to merge these files into one built-in.a file.
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This is a thin archive without a symbol table, which makes it
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unsuitable as a linker input.
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The scripts/link-vmlinux.sh script later makes an aggregate
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built-in.o with "${AR} rcsTP", which creates the thin archive
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built-in.a with "${AR} rcsTP", which creates the thin archive
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with a symbol table and an index, making it a valid input for
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the final vmlinux link passes.
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The order of files in $(obj-y) is significant. Duplicates in
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the lists are allowed: the first instance will be linked into
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built-in.o and succeeding instances will be ignored.
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built-in.a and succeeding instances will be ignored.
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Link order is significant, because certain functions
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(module_init() / __initcall) will be called during boot in the
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@ -228,7 +228,7 @@ more details, with real examples.
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Note: Of course, when you are building objects into the kernel,
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the syntax above will also work. So, if you have CONFIG_EXT2_FS=y,
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kbuild will build an ext2.o file for you out of the individual
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parts and then link this into built-in.o, as you would expect.
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parts and then link this into built-in.a, as you would expect.
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--- 3.4 Objects which export symbols
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@ -238,7 +238,7 @@ more details, with real examples.
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--- 3.5 Library file goals - lib-y
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Objects listed with obj-* are used for modules, or
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combined in a built-in.o for that specific directory.
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combined in a built-in.a for that specific directory.
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There is also the possibility to list objects that will
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be included in a library, lib.a.
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All objects listed with lib-y are combined in a single
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@ -250,7 +250,7 @@ more details, with real examples.
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Note that the same kbuild makefile may list files to be built-in
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and to be part of a library. Therefore the same directory
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may contain both a built-in.o and a lib.a file.
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may contain both a built-in.a and a lib.a file.
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Example:
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#arch/x86/lib/Makefile
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@ -992,7 +992,7 @@ When kbuild executes, the following steps are followed (roughly):
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$(head-y) lists objects to be linked first in vmlinux.
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$(libs-y) lists directories where a lib.a archive can be located.
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The rest list directories where a built-in.o object file can be
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The rest list directories where a built-in.a object file can be
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located.
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$(init-y) objects will be located after $(head-y).
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@ -1077,7 +1077,7 @@ When kbuild executes, the following steps are followed (roughly):
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extra-y := head.o init_task.o
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In this example, extra-y is used to list object files that
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shall be built, but shall not be linked as part of built-in.o.
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shall be built, but shall not be linked as part of built-in.a.
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--- 6.7 Commands useful for building a boot image
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@ -78,7 +78,7 @@ Binutils
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--------
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The build system has, as of 4.13, switched to using thin archives (`ar T`)
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rather than incremental linking (`ld -r`) for built-in.o intermediate steps.
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rather than incremental linking (`ld -r`) for built-in.a intermediate steps.
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This requires binutils 2.20 or newer.
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Flex
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14
Makefile
14
Makefile
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@ -35,7 +35,7 @@ unexport GREP_OPTIONS
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# Most importantly: sub-Makefiles should only ever modify files in
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# their own directory. If in some directory we have a dependency on
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# a file in another dir (which doesn't happen often, but it's often
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# unavoidable when linking the built-in.o targets which finally
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# unavoidable when linking the built-in.a targets which finally
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# turn into vmlinux), we will call a sub make in that other dir, and
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# after that we are sure that everything which is in that other dir
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# is now up to date.
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@ -982,13 +982,13 @@ vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
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vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
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$(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
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init-y := $(patsubst %/, %/built-in.o, $(init-y))
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core-y := $(patsubst %/, %/built-in.o, $(core-y))
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drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
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net-y := $(patsubst %/, %/built-in.o, $(net-y))
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init-y := $(patsubst %/, %/built-in.a, $(init-y))
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core-y := $(patsubst %/, %/built-in.a, $(core-y))
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drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
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net-y := $(patsubst %/, %/built-in.a, $(net-y))
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libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
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libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
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virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
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libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
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virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
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# Externally visible symbols (used by link-vmlinux.sh)
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export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
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@ -36,7 +36,7 @@ EXPORT_SYMBOL(memchr);
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/*
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* Because string functions are both inline and exported functions and
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* folder arch/blackfin/lib is configured as a library path in Makefile,
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* symbols exported in folder lib is not linked into built-in.o but
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* symbols exported in folder lib is not linked into built-in.a but
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* inlined only. In order to export string symbols to kernel module
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* properly, they should be exported here.
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*/
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@ -165,7 +165,7 @@ systbl_chk: $(src)/systbl_chk.sh $(obj)/systbl_chk.i
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$(call cmd,systbl_chk)
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ifeq ($(CONFIG_PPC_OF_BOOT_TRAMPOLINE),y)
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$(obj)/built-in.o: prom_init_check
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$(obj)/built-in.a: prom_init_check
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quiet_cmd_prom_init_check = CALL $<
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cmd_prom_init_check = $(CONFIG_SHELL) $< "$(NM)" "$(obj)/prom_init.o"
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@ -5,5 +5,5 @@
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obj-y += cio/ block/ char/ crypto/ net/ scsi/ virtio/
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drivers-y += drivers/s390/built-in.o
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drivers-y += drivers/s390/built-in.a
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@ -324,11 +324,11 @@ config DEBUG_SECTION_MISMATCH
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the analysis would not catch the illegal reference.
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This option tells gcc to inline less (but it does result in
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a larger kernel).
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- Run the section mismatch analysis for each module/built-in.o file.
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- Run the section mismatch analysis for each module/built-in.a file.
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When we run the section mismatch analysis on vmlinux.o, we
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lose valuable information about where the mismatch was
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introduced.
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Running the analysis for each module/built-in.o file
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Running the analysis for each module/built-in.a file
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tells where the mismatch happens much closer to the
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source. The drawback is that the same mismatch is
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reported at least twice.
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@ -77,7 +77,7 @@ obj-y += $(obj)/lib-ksyms.o
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endif
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ifneq ($(strip $(obj-y) $(need-builtin)),)
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builtin-target := $(obj)/built-in.o
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builtin-target := $(obj)/built-in.a
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endif
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modorder-target := $(obj)/modules.order
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@ -104,7 +104,7 @@ ifneq ($(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.o
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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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@ -458,15 +458,15 @@ $(sort $(subdir-obj-y)): $(subdir-ym) ;
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#
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ifdef builtin-target
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# built-in.o archives are made with no symbol table or index which
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# built-in.a archives are made with no symbol table or index which
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# makes them small and fast, but unable to be used by the linker.
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# scripts/link-vmlinux.sh builds an aggregate built-in.o with a symbol
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# scripts/link-vmlinux.sh builds an aggregate built-in.a with a symbol
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# table and index.
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cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
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cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
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quiet_cmd_link_o_target = AR $@
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# If the list of objects to link is empty, just create an empty built-in.o
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# If the list of objects to link is empty, just create an empty built-in.a
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cmd_link_o_target = $(if $(strip $(obj-y)),\
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$(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
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$(cmd_secanalysis),\
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@ -27,7 +27,7 @@ modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko
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# Handle objects in subdirs
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# ---------------------------------------------------------------------------
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# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
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# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
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# and add the directory to the list of dirs to descend into: $(subdir-y)
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# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
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# and add the directory to the list of dirs to descend into: $(subdir-m)
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@ -35,7 +35,7 @@ __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
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subdir-y += $(__subdir-y)
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__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
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subdir-m += $(__subdir-m)
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obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
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obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
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obj-m := $(filter-out %/, $(obj-m))
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# Subdirectories we need to descend into
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@ -54,7 +54,7 @@ multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
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# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
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# tell kbuild to descend
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subdir-obj-y := $(filter %/built-in.o, $(obj-y))
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subdir-obj-y := $(filter %/built-in.a, $(obj-y))
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# Replace multi-part objects by their individual parts, look at local dir only
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real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
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@ -4,7 +4,7 @@
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# link vmlinux
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#
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# vmlinux is linked from the objects selected by $(KBUILD_VMLINUX_INIT) and
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# $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.o files
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# $(KBUILD_VMLINUX_MAIN) and $(KBUILD_VMLINUX_LIBS). Most are built-in.a files
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# from top-level directories in the kernel tree, others are specified in
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# arch/$(ARCH)/Makefile. Ordering when linking is important, and
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# $(KBUILD_VMLINUX_INIT) must be first. $(KBUILD_VMLINUX_LIBS) are archives
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@ -18,7 +18,7 @@
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# | +--< init/version.o + more
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# |
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# +--< $(KBUILD_VMLINUX_MAIN)
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# | +--< drivers/built-in.o mm/built-in.o + more
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# | +--< drivers/built-in.a mm/built-in.a + more
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# |
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# +--< $(KBUILD_VMLINUX_LIBS)
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# | +--< lib/lib.a + more
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@ -51,13 +51,13 @@ info()
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#
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# Traditional incremental style of link does not require this step
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#
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# built-in.o output file
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# built-in.a output file
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#
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archive_builtin()
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{
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info AR built-in.o
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rm -f built-in.o;
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${AR} rcsTP${KBUILD_ARFLAGS} built-in.o \
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info AR built-in.a
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rm -f built-in.a;
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${AR} rcsTP${KBUILD_ARFLAGS} built-in.a \
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${KBUILD_VMLINUX_INIT} \
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${KBUILD_VMLINUX_MAIN}
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}
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@ -69,7 +69,7 @@ modpost_link()
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local objects
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objects="--whole-archive \
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built-in.o \
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built-in.a \
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--no-whole-archive \
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--start-group \
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${KBUILD_VMLINUX_LIBS} \
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@ -88,7 +88,7 @@ vmlinux_link()
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if [ "${SRCARCH}" != "um" ]; then
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objects="--whole-archive \
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built-in.o \
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built-in.a \
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--no-whole-archive \
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--start-group \
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${KBUILD_VMLINUX_LIBS} \
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@ -99,7 +99,7 @@ vmlinux_link()
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-T ${lds} ${objects}
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else
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objects="-Wl,--whole-archive \
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built-in.o \
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built-in.a \
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-Wl,--no-whole-archive \
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-Wl,--start-group \
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${KBUILD_VMLINUX_LIBS} \
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@ -164,7 +164,7 @@ cleanup()
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rm -f .tmp_System.map
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rm -f .tmp_kallsyms*
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rm -f .tmp_vmlinux*
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rm -f built-in.o
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rm -f built-in.a
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rm -f System.map
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rm -f vmlinux
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rm -f vmlinux.o
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@ -164,7 +164,7 @@ sub linux_objects
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s:^\./::;
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if (/.*\.o$/ &&
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! (
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m:/built-in.o$:
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m:/built-in.a$:
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|| m:arch/x86/vdso/:
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|| m:arch/x86/boot/:
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|| m:arch/ia64/ia32/ia32.o$:
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@ -10,7 +10,7 @@
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ld -m elf_i386 --format binary --oformat elf32-i386 -r \
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-T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o
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ld -m elf_i386 -r -o built-in.o initramfs_data.o
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ld -m elf_i386 -r -o built-in.a initramfs_data.o
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For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds.
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Reference in New Issue