linux-kernel - [PATCH] Makefile.extrawarn: enable -Wmissing-variable-declarations for W=1

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Date:   Mon, 07 Aug 2023 09:50:32 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nicolas Schier <nicolas@...sle.eu>, Tom Rix <trix@...hat.com>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH] Makefile.extrawarn: enable -Wmissing-variable-declarations
 for W=1

I noticed Tom was sending patches where smatch was recommending
annotating functions as static when no previous declaration existed.
Surely the compiler could make such recommendations as well, I thought.

Looks like -Wmissing-variable-declarations can make such
recommendations.

GCC just added support for this warning (gcc 14.1.0 will ship with
support), and all versions of clang relevant to building the kernel
support this flag.

Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 scripts/Makefile.extrawarn | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 40cd13eca82e..617739eb84e2 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -32,6 +32,7 @@ KBUILD_CFLAGS += $(call cc-option, -Wunused-but-set-variable)
 KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
 KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned)
 KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation)
+KBUILD_CFLAGS += $(call cc-option, -Wmissing-varibale-declarations)
 # The following turn off the warnings enabled by -Wextra
 KBUILD_CFLAGS += -Wno-missing-field-initializers
 KBUILD_CFLAGS += -Wno-sign-compare

---
base-commit: 52a93d39b17dc7eb98b6aa3edb93943248e03b2f
change-id: 20230807-missing_proto-0cb90ec6454c

Best regards,
-- 
Nick Desaulniers <ndesaulniers@...gle.com>