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The objects placed at the head of vmlinux need special treatments: - arch/$(SRCARCH)/Makefile adds them to head-y in order to place them before other archives in the linker command line. - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of obj-y to avoid them going into built-in.a. This commit gets rid of the latter. Create vmlinux.a to collect all the objects that are unconditionally linked to vmlinux. The objects listed in head-y are moved to the head of vmlinux.a by using 'ar m'. With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y for builtin objects. There is no *.o that is directly linked to vmlinux. Drop unneeded code in scripts/clang-tools/gen_compile_commands.py. $(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggested by Nathan Chancellor [1]. [1]: https://lore.kernel.org/llvm/YyjjT5gQ2hGMH0ni@dev-arch.thelio-3990X/ Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
35 lines
1.0 KiB
Makefile
35 lines
1.0 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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#
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# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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#
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obj-y := head.o arcksyms.o setup.o irq.o reset.o ptrace.o process.o devtree.o
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obj-y += signal.o traps.o sys.o troubleshoot.o stacktrace.o disasm.o
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obj-$(CONFIG_ISA_ARCOMPACT) += entry-compact.o intc-compact.o
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obj-$(CONFIG_ISA_ARCV2) += entry-arcv2.o intc-arcv2.o
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obj-$(CONFIG_MODULES) += arcksyms.o module.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_ARC_MCIP) += mcip.o
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obj-$(CONFIG_ARC_DW2_UNWIND) += unwind.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_ARC_EMUL_UNALIGNED) += unaligned.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_ARC_METAWARE_HLINK) += arc_hostlink.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o
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ifdef CONFIG_ISA_ARCOMPACT
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CFLAGS_fpu.o += -mdpfp
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endif
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ifdef CONFIG_ARC_DW2_UNWIND
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CFLAGS_ctx_sw.o += -fno-omit-frame-pointer
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obj-y += ctx_sw.o
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else
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obj-y += ctx_sw_asm.o
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endif
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extra-y := vmlinux.lds
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