From: Masahiro Yamada <masahiroy@kernel.org>
Date: Wed, 6 Mar 2024 12:47:09 +0000 (+0900)
Subject: kbuild: remove GCC's default -Wpacked-bitfield-compat flag
X-Git-Tag: microblaze-v6.10~34^2~9
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=44929bfaceaaa6a854ddc6df6de9433fab1eef92;p=linux-2.6-microblaze.git

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

Commit 4a5838ad9d2d ("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>
---

diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 2f25a1de129d..3ce5d503a6da 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -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