kbuild: fix duplicated flags in DEBUG_CFLAGS

stable inclusion
from stable-5.10.15
commit 19155473f3bac244def9f7a7ee609e7f4dbca357
bugzilla: 48167

--------------------------------

[ Upstream commit 315da87c ]

Sedat Dilek noticed duplicated flags in DEBUG_CFLAGS when building
deb-pkg with CONFIG_DEBUG_INFO. For example, 'make CC=clang bindeb-pkg'
reproduces the issue.

Kbuild recurses to the top Makefile for some targets such as package
builds.

With commit 121c5d08 ("kbuild: Only add -fno-var-tracking-assignments
for old GCC versions") applied, DEBUG_CFLAGS is now reset only when
CONFIG_CC_IS_GCC=y.

Fix it to reset DEBUG_CFLAGS all the time.

Fixes: 121c5d08 ("kbuild: Only add -fno-var-tracking-assignments for old GCC versions")
Reported-by: NSedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: NMasahiro Yamada <masahiroy@kernel.org>
Tested-by: NSedat Dilek <sedat.dilek@gmail.com>
Reviewed-by: NMark Wielaard <mark@klomp.org>
Reviewed-by: NNathan Chancellor <nathan@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

Makefile

@@ -812,10 +812,12 @@ KBUILD_CFLAGS	+= -ftrivial-auto-var-init=zero
 KBUILD_CFLAGS	+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 endif
 
+DEBUG_CFLAGS	:=
+
 # Workaround for GCC versions < 5.0
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
 ifdef CONFIG_CC_IS_GCC
-DEBUG_CFLAGS	:= $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
+DEBUG_CFLAGS	+= $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
 endif
 
 ifdef CONFIG_DEBUG_INFO