linux-kernel - [PATCH] kbuild: suppress warnings for single builds of vmlinux.lds, *.a, etc.

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Date:   Mon, 26 Sep 2022 10:26:09 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH] kbuild: suppress warnings for single builds of vmlinux.lds, *.a, etc.

vmlinux-deps is unneeded because the dependency can directly list
$(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)

Do not cancel the rule; building an individual vmlinux.lds, built-in.a,
or lib.a is working now, but the warning "overriding recipe for target"
is shown.

Without this patch:

  $ make arch/x86/kernel/vmlinux.lds
  Makefile:1798: warning: overriding recipe for target 'arch/x86/kernel/vmlinux.lds'
  Makefile:1162: warning: ignoring old recipe for target 'arch/x86/kernel/vmlinux.lds'
    [ snip ]
    LDS     arch/x86/kernel/vmlinux.lds

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 Makefile | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 244c07f1cc70..3e6974b4ebf2 100644
--- a/Makefile
+++ b/Makefile
@@ -1118,7 +1118,8 @@ endif
 export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
 export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
 
-vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
+# The actual objects are generated when descending.
+$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): .
 
 # Recurse until adjust_autoksyms.sh is satisfied
 PHONY += autoksyms_recursive
@@ -1157,10 +1158,6 @@ vmlinux: scripts/link-vmlinux.sh vmlinux.o $(KBUILD_LDS) FORCE
 
 targets := vmlinux
 
-# The actual objects are generated when descending,
-# make sure no implicit rule kicks in
-$(sort $(vmlinux-deps)): . ;
-
 filechk_kernel.release = \
 	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
 
-- 
2.34.1