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kbuild: remove GCC's default -Wpacked-bitfield-compat flag

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Commit 4a5838ad9d ("kbuild: Add extra gcc checks") added the
-Wpacked-bitfield-compat flag, but there is no need to add it
explicitly.

GCC manual says:
  "This warning is enabled by default. Use -Wno-packed-bitfield-compat
   to disable this warning."

The test code in the manual:

  struct foo
  {
    char a:4;
    char b:8;
  } __attribute__ ((packed));

... emits "note: offset of packed bit-field ‘b’ has changed in GCC 4.4"
without W=3.

Let's remove it, as it is a default with GCC.

Clang does not support this flag, so its removal will not affect Clang
builds.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
Masahiro Yamada 2024-03-06 21:47:09 +09:00
parent e2bad142bb
commit 44929bface
1 changed files with 0 additions and 1 deletions
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scripts/Makefile.extrawarn
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@ -187,7 +187,6 @@ KBUILD_CFLAGS += -Wpointer-arith
KBUILD_CFLAGS += -Wredundant-decls
KBUILD_CFLAGS += -Wsign-compare
KBUILD_CFLAGS += -Wswitch-default
KBUILD_CFLAGS += $(call cc-option, -Wpacked-bitfield-compat)
KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN3