linux-kernel - [PATCH 4.9 086/101] kbuild: clear LDFLAGS in the top Makefile

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Message-Id: <20220823080037.829968607@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:03:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nicolas Pitre <nico@...aro.org>
Subject: [PATCH 4.9 086/101] kbuild: clear LDFLAGS in the top Makefile

From: Masahiro Yamada <yamada.masahiro@...ionext.com>

commit ce99d0bf312daf0178e640da9e3c93b773a67e7d upstream.

Currently LDFLAGS is not cleared, so same flags are accumulated in
LDFLAGS when the top Makefile is recursively invoked.

I found unneeded rebuild for ARCH=arm64 when CONFIG_TRIM_UNUSED_KSYMS
is enabled.  If include/generated/autoksyms.h is updated, the top
Makefile is recursively invoked, then arch/arm64/Makefile adds one
more '-maarch64linux'.  Due to the command line change, modules are
rebuilt needlessly.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Acked-by: Nicolas Pitre <nico@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 Makefile |    1 +
 1 file changed, 1 insertion(+)

--- a/Makefile
+++ b/Makefile
@@ -395,6 +395,7 @@ KBUILD_CFLAGS_KERNEL :=
 KBUILD_AFLAGS_MODULE  := -DMODULE
 KBUILD_CFLAGS_MODULE  := -DMODULE
 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
+LDFLAGS :=
 GCC_PLUGINS_CFLAGS :=
 CLANG_FLAGS :=