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From:   Arnd Bergmann <arnd@kernel.org>
To:     Peter Oberparleiter <oberpar@linux.ibm.com>
Cc:     Arnd Bergmann <arnd@arndb.de>, linux-kernel@vger.kernel.org
Subject: [PATCH] [v2] gcov: shut up missing prototype warnings for internal stubs
Date:   Tue, 25 Jul 2023 14:23:38 +0200
Message-Id: <20230725123042.2269077-1-arnd@kernel.org>
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From: Arnd Bergmann <arnd@arndb.de>

gcov uses global functions that are called from generated code,
but these have no prototype in a header, which causes a W=1
build warning:

kernel/gcov/gcc_base.c:12:6: error: no previous prototype for '__gcov_init' [-Werror=missing-prototypes]
kernel/gcov/gcc_base.c:40:6: error: no previous prototype for '__gcov_flush' [-Werror=missing-prototypes]
kernel/gcov/gcc_base.c:46:6: error: no previous prototype for '__gcov_merge_add' [-Werror=missing-prototypes]
kernel/gcov/gcc_base.c:52:6: error: no previous prototype for '__gcov_merge_single' [-Werror=missing-prototypes]

Just turn off these warnings unconditionally for the two files
that contain them.

Link: https://lore.kernel.org/all/0820010f-e9dc-779d-7924-49c7df446bce@linux.ibm.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 kernel/gcov/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/gcov/Makefile b/kernel/gcov/Makefile
index 16f8ecc7d8821..ccd02afaeffb4 100644
--- a/kernel/gcov/Makefile
+++ b/kernel/gcov/Makefile
@@ -3,4 +3,6 @@ ccflags-y := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"'
 
 obj-y := base.o fs.o
 obj-$(CONFIG_CC_IS_GCC) += gcc_base.o gcc_4_7.o
+CFLAGS_gcc_base.o += -Wno-missing-prototypes -Wno-missing-declarations
 obj-$(CONFIG_CC_IS_CLANG) += clang.o
+CFLAGS_clang.o += -Wno-missing-prototypes -Wno-missing-declarations
-- 
2.39.2