# git rev-parse -q --verify 44929bfaceaaa6a854ddc6df6de9433fab1eef92^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/mirror/linux-kbuild.git for-next
remote: warning: multi-pack bitmap is missing required reverse index        
# git rev-parse -q --verify 44929bfaceaaa6a854ddc6df6de9433fab1eef92^{commit}
44929bfaceaaa6a854ddc6df6de9433fab1eef92
# git checkout -q -f -B kisskb 44929bfaceaaa6a854ddc6df6de9433fab1eef92
# git clean -qxdf
# < git log -1
# commit 44929bfaceaaa6a854ddc6df6de9433fab1eef92
# Author: Masahiro Yamada <masahiroy@kernel.org>
# Date:   Wed Mar 6 21:47:09 2024 +0900
# 
#     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>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 44929bfaceaaa6a854ddc6df6de9433fab1eef92
# make -s -j 24 ARCH=powerpc O=/kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pmac32_defconfig
# Added to kconfig CONFIG_SMP=y
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 24 ARCH=powerpc O=/kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
.config:4513:warning: override: reassigning to symbol SMP
# make -s -j 24 ARCH=powerpc O=/kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/kbuild_pmac32_defconfig+SMP_powerpc-gcc5
# Build took: 0:02:57.954339