kbuild: remove incremental linking option
This removes the old `ld -r` incremental link option, which has not been selected by any architecture since June 2017. 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
1fe7d2bb24
commit
6358d6e8b9
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@ -153,8 +153,14 @@ more details, with real examples.
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configuration.
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Kbuild compiles all the $(obj-y) files. It then calls
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"$(LD) -r" to merge these files into one built-in.o file.
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built-in.o is later linked into vmlinux by the parent Makefile.
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"$(AR) rcSTP" to merge these files into one built-in.o file.
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This is a thin archive without a symbol table, which makes it
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unsuitable as a linker input.
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The scripts/link-vmlinux.sh script later makes an aggregate
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built-in.o with "${AR} rcsTP", which creates the thin archive
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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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@ -596,12 +596,6 @@ config CC_STACKPROTECTOR_AUTO
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endchoice
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config THIN_ARCHIVES
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def_bool y
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help
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Select this if the architecture wants to use thin archives
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instead of ld -r to create the built-in.o files.
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config LD_DEAD_CODE_DATA_ELIMINATION
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bool
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help
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@ -458,15 +458,13 @@ $(sort $(subdir-obj-y)): $(subdir-ym) ;
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#
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ifdef builtin-target
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ifdef CONFIG_THIN_ARCHIVES
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# built-in.o 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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# 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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else
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cmd_make_builtin = $(LD) $(ld_flags) -r -o
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cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
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quiet_cmd_link_o_target = LD $@
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endif
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# If the list of objects to link is empty, just create an empty built-in.o
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cmd_link_o_target = $(if $(strip $(obj-y)),\
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@ -499,11 +497,8 @@ $(modorder-target): $(subdir-ym) FORCE
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ifdef lib-target
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quiet_cmd_link_l_target = AR $@
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ifdef CONFIG_THIN_ARCHIVES
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# lib target archives do get a symbol table and index
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cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
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else
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cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
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endif
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$(lib-target): $(lib-y) FORCE
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$(call if_changed,link_l_target)
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@ -551,13 +546,8 @@ $($(subst $(obj)/,,$(@:.o=-m)))), $^)
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cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
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ifdef CONFIG_THIN_ARCHIVES
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quiet_cmd_link_multi-y = AR $@
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cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
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else
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quiet_cmd_link_multi-y = LD $@
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cmd_link_multi-y = $(cmd_link_multi-link)
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endif
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quiet_cmd_link_multi-m = LD [M] $@
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cmd_link_multi-m = $(cmd_link_multi-link)
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@ -55,13 +55,11 @@ info()
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#
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archive_builtin()
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{
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if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
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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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${KBUILD_VMLINUX_INIT} \
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${KBUILD_VMLINUX_MAIN}
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fi
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}
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# Link of vmlinux.o used for section mismatch analysis
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@ -70,20 +68,13 @@ modpost_link()
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{
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local objects
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if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
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objects="--whole-archive \
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built-in.o \
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--no-whole-archive \
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--start-group \
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${KBUILD_VMLINUX_LIBS} \
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--end-group"
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else
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objects="${KBUILD_VMLINUX_INIT} \
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--start-group \
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${KBUILD_VMLINUX_MAIN} \
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${KBUILD_VMLINUX_LIBS} \
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--end-group"
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fi
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${LD} ${LDFLAGS} -r -o ${1} ${objects}
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}
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@ -96,7 +87,6 @@ vmlinux_link()
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local objects
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if [ "${SRCARCH}" != "um" ]; then
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if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
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objects="--whole-archive \
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built-in.o \
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--no-whole-archive \
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@ -104,19 +94,10 @@ vmlinux_link()
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${KBUILD_VMLINUX_LIBS} \
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--end-group \
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${1}"
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else
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objects="${KBUILD_VMLINUX_INIT} \
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--start-group \
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${KBUILD_VMLINUX_MAIN} \
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${KBUILD_VMLINUX_LIBS} \
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--end-group \
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${1}"
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fi
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${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2} \
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-T ${lds} ${objects}
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else
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if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
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objects="-Wl,--whole-archive \
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built-in.o \
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-Wl,--no-whole-archive \
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@ -124,14 +105,6 @@ vmlinux_link()
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${KBUILD_VMLINUX_LIBS} \
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-Wl,--end-group \
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${1}"
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else
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objects="${KBUILD_VMLINUX_INIT} \
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-Wl,--start-group \
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${KBUILD_VMLINUX_MAIN} \
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${KBUILD_VMLINUX_LIBS} \
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-Wl,--end-group \
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${1}"
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fi
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${CC} ${CFLAGS_vmlinux} -o ${2} \
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-Wl,-T,${lds} \
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