From 9c72d26e9fe3be79dd1d8a2ba00a033503ffd27d Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Fri, 29 May 2026 11:53:44 -0700 Subject: kbuild: move vmlinux.a build rule to scripts/Makefile.vmlinux_a Move the build rule for vmlinux.a to a separate file in preparation for supporting distributed builds with Clang ThinLTO. Signed-off-by: Masahiro Yamada Tested-by: Rong Xu Tested-by: Piotr Gorski Tested-by: Nathan Chancellor Signed-off-by: Rong Xu Link: https://patch.msgid.link/20260529185347.2418373-2-xur@google.com [nathan: Squash in forward fix from Rong around '--thin' to $(AR) https://patch.msgid.link/20260529185347.2418373-3-xur@google.com] Signed-off-by: Nathan Chancellor --- scripts/Makefile.vmlinux_a | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 scripts/Makefile.vmlinux_a (limited to 'scripts') diff --git a/scripts/Makefile.vmlinux_a b/scripts/Makefile.vmlinux_a new file mode 100644 index 000000000000..650d44330d1f --- /dev/null +++ b/scripts/Makefile.vmlinux_a @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: GPL-2.0-only + +PHONY := __default +__default: vmlinux.a + +include include/config/auto.conf +include $(srctree)/scripts/Kbuild.include +include $(srctree)/scripts/Makefile.lib + +# Link of built-in-fixup.a +# --------------------------------------------------------------------------- + +# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 +quiet_cmd_ar_builtin_fixup = AR $@ + cmd_ar_builtin_fixup = \ + rm -f $@; \ + $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ + $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) + +targets += built-in-fixup.a +built-in-fixup.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE + $(call if_changed,ar_builtin_fixup) + +# vmlinux.a +# --------------------------------------------------------------------------- + +targets += vmlinux.a +vmlinux.a: built-in-fixup.a FORCE + $(call if_changed,copy) + +# Add FORCE to the prerequisites 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) -- cgit v1.2.3