linux-kernel - [PATCH] Makefile.extrawarn: add -Wformat-insufficient-args for clang build

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Date:   Sat, 16 Jul 2022 17:45:32 +0900
From:   Youngmin Nam <youngmin.nam@...sung.com>
To:     masahiroy@...nel.org, michal.lkml@...kovi.net,
        ndesaulniers@...gle.com
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        hosung0.kim@...sung.com, d7271.choe@...sung.com,
        Youngmin Nam <youngmin.nam@...sung.com>
Subject: [PATCH] Makefile.extrawarn: add -Wformat-insufficient-args for
 clang build

The -Wformat-insufficient-args for clang is useful to detect the situation
when the total number is unmatched between format specifiers and arguments.

Originally, this option is enabled by default(Link[1]), but it is disabled by
-Wno-format explicitly so that we can't detect this unmatched situation.

We can enable it by adding this option after -Wno-format.

Link[1]: https://releases.llvm.org/13.0.0/tools/clang/docs/DiagnosticsReference.html#wformat-insufficient-args
Signed-off-by: Youngmin Nam <youngmin.nam@...sung.com>
---
 scripts/Makefile.extrawarn | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index f5f0d6f09053..c23d7c286bad 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -48,6 +48,7 @@ else
 ifdef CONFIG_CC_IS_CLANG
 KBUILD_CFLAGS += -Wno-initializer-overrides
 KBUILD_CFLAGS += -Wno-format
+KBUILD_CFLAGS += -Wformat-insufficient-args
 KBUILD_CFLAGS += -Wno-sign-compare
 KBUILD_CFLAGS += -Wno-format-zero-length
 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast)
-- 
2.34.0