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authorMasahiro Yamada <masahiroy@kernel.org>2022-05-29 00:47:03 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2022-06-05 06:20:57 +0900
commit5d45950dfbb1540bba3e3762a3497de8b4a715d3 (patch)
treed3f3ceb136fe3b75fed5e2a3627ddc3e6ac43511
parentb0d6207bad2cb5a6f2099ac4a6ea4e76864dd596 (diff)
kbuild: move vmlinux.o link to scripts/Makefile.vmlinux_o
This is a preparation for moving the objtool rule in the next commit. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
-rw-r--r--scripts/Makefile.vmlinux_o61
-rwxr-xr-xscripts/link-vmlinux.sh41
2 files changed, 62 insertions, 40 deletions
diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
new file mode 100644
index 000000000000..a9b375ca86d5
--- /dev/null
+++ b/scripts/Makefile.vmlinux_o
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+PHONY := __default
+__default: vmlinux.o
+
+include include/config/auto.conf
+include $(srctree)/scripts/Kbuild.include
+
+# Generate a linker script to ensure correct ordering of initcalls for Clang LTO
+# ---------------------------------------------------------------------------
+
+quiet_cmd_gen_initcalls_lds = GEN $@
+ cmd_gen_initcalls_lds = \
+ $(PYTHON3) $(srctree)/scripts/jobserver-exec \
+ $(PERL) $(real-prereqs) > $@
+
+.tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \
+ $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
+ $(call if_changed,gen_initcalls_lds)
+
+targets := .tmp_initcalls.lds
+
+ifdef CONFIG_LTO_CLANG
+initcalls-lds := .tmp_initcalls.lds
+endif
+
+# Link of vmlinux.o used for section mismatch analysis
+# ---------------------------------------------------------------------------
+
+quiet_cmd_ld_vmlinux.o = LD $@
+ cmd_ld_vmlinux.o = \
+ $(LD) ${KBUILD_LDFLAGS} -r -o $@ \
+ $(addprefix -T , $(initcalls-lds)) \
+ --whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \
+ --start-group $(KBUILD_VMLINUX_LIBS) --end-group \
+
+define rule_ld_vmlinux.o
+ $(call cmd_and_savecmd,ld_vmlinux.o)
+endef
+
+vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE
+ $(call if_changed_rule,ld_vmlinux.o)
+
+targets += vmlinux.o
+
+# 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)
+
+.PHONY: $(PHONY)
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 3f51b08cc203..bf685d4547c1 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -45,45 +45,6 @@ info()
printf " %-7s %s\n" "${1}" "${2}"
}
-# Generate a linker script to ensure correct ordering of initcalls.
-gen_initcalls()
-{
- info GEN .tmp_initcalls.lds
-
- ${PYTHON3} ${srctree}/scripts/jobserver-exec \
- ${PERL} ${srctree}/scripts/generate_initcall_order.pl \
- ${KBUILD_VMLINUX_OBJS} ${KBUILD_VMLINUX_LIBS} \
- > .tmp_initcalls.lds
-}
-
-# Link of vmlinux.o used for section mismatch analysis
-# ${1} output file
-modpost_link()
-{
- local objects
- local lds=""
-
- objects="--whole-archive \
- ${KBUILD_VMLINUX_OBJS} \
- --no-whole-archive \
- --start-group \
- ${KBUILD_VMLINUX_LIBS} \
- --end-group"
-
- if is_enabled CONFIG_LTO_CLANG; then
- gen_initcalls
- lds="-T .tmp_initcalls.lds"
-
- # This might take a while, so indicate that we're doing
- # an LTO link
- info LTO ${1}
- else
- info LD ${1}
- fi
-
- ${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${lds} ${objects}
-}
-
objtool_link()
{
local objtoolcmd;
@@ -336,7 +297,7 @@ fi;
${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
#link vmlinux.o
-modpost_link vmlinux.o
+${MAKE} -f "${srctree}/scripts/Makefile.vmlinux_o"
objtool_link vmlinux.o
# Generate the list of in-tree objects in vmlinux