mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-06-21 15:43:21 +02:00
Nathan Chancellor
a48bd961fb
In cmd_ar_builtin_fixup, the 'T' modifier was added to '$(AR) mPi' to
work around a bug in llvm-ar that caused thin archives to be silently
converted to full archives [1]. Since commit 20c0989283 ("kbuild: Bump
minimum version of LLVM for building the kernel to 15.0.0"), all
supported versions of llvm-ar have this issue fixed, so the 'T' modifier
and comment can be removed.
Link: https://github.com/llvm/llvm-project/commit/d17c54d17de22d2961a04163f3dbc8e973de89b8 [1]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
83 lines
2.3 KiB
Makefile
83 lines
2.3 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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PHONY := __default
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__default: vmlinux.a
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include include/config/auto.conf
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include $(srctree)/scripts/Kbuild.include
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include $(srctree)/scripts/Makefile.lib
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# Link of built-in-fixup.a
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# ---------------------------------------------------------------------------
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quiet_cmd_ar_builtin_fixup = AR $@
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cmd_ar_builtin_fixup = \
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rm -f $@; \
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$(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
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$(AR) mPi $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
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targets += built-in-fixup.a
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built-in-fixup.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
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$(call if_changed,ar_builtin_fixup)
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ifdef CONFIG_LTO_CLANG_THIN_DIST
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quiet_cmd_builtin.order = GEN $@
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cmd_builtin.order = $(AR) t $< > $@
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targets += builtin.order
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builtin.order: built-in-fixup.a FORCE
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$(call if_changed,builtin.order)
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quiet_cmd_ld_thinlto_index = LD $@
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cmd_ld_thinlto_index = \
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$(LD) $(KBUILD_LDFLAGS) -r --thinlto-index-only=$@ @$<
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targets += vmlinux.thinlto-index
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vmlinux.thinlto-index: builtin.order FORCE
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$(call if_changed,ld_thinlto_index)
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quiet_cmd_ar_vmlinux.a = GEN $@
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cmd_ar_vmlinux.a = \
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rm -f $@; \
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while read -r obj; do \
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if grep -Fqx $${obj} $(word 2, $^); then \
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echo $${obj%.o}.thinlto-native.o; \
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else \
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echo $${obj}; \
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fi; \
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done < $< | xargs $(AR) cDPrS --thin $@
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targets += vmlinux.a
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vmlinux.a: builtin.order vmlinux.thinlto-index FORCE
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.thinlto
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$(call if_changed,ar_vmlinux.a)
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else
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# vmlinux.a
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# ---------------------------------------------------------------------------
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targets += vmlinux.a
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vmlinux.a: built-in-fixup.a FORCE
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$(call if_changed,copy)
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endif
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# Add FORCE to the prerequisites of a target to force it to be always rebuilt.
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# ---------------------------------------------------------------------------
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PHONY += FORCE
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FORCE:
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# Read all saved command lines and dependencies for the $(targets) we
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# may be building above, using $(if_changed{,_dep}). As an
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# optimization, we don't need to read them if the target does not
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# exist, we will rebuild anyway in that case.
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existing-targets := $(wildcard $(sort $(targets)))
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-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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.PHONY: $(PHONY)
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