target/linux/generic/backport-4.9/014-Kbuild-suppress-packed-not-aligned-warning-for-defau.patch

   1 From: Xiongfeng Wang <xiongfeng.wang@linaro.org>
   2 Date: Thu, 11 Jan 2018 17:22:29 +0800
   3 Subject: [PATCH] Kbuild: suppress packed-not-aligned warning for default
   4  setting only
   5
   6 gcc-8 reports many -Wpacked-not-aligned warnings. The below are some
   7 examples.
   8
   9 ./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
  10 ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
  11  } __attribute__ ((packed));
  12
  13 ./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
  14 ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
  15  } __attribute__ ((packed));
  16
  17 ./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
  18 ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
  19  } __attribute__ ((packed));
  20
  21 This patch suppresses this kind of warnings for default setting.
  22
  23 Signed-off-by: Xiongfeng Wang <xiongfeng.wang@linaro.org>
  24 Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
  25 ---
  26
  27 --- a/scripts/Makefile.extrawarn
  28 +++ b/scripts/Makefile.extrawarn
  29 @@ -10,6 +10,8 @@
  30  # are not supported by all versions of the compiler
  31  # ==========================================================================
  32
  33 +KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
  34 +
  35  ifeq ("$(origin W)", "command line")
  36    export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
  37  endif
  38 @@ -25,6 +27,7 @@ warning-1 += -Wold-style-definition
  39  warning-1 += $(call cc-option, -Wmissing-include-dirs)
  40  warning-1 += $(call cc-option, -Wunused-but-set-variable)
  41  warning-1 += $(call cc-option, -Wunused-const-variable)
  42 +warning-1 += $(call cc-option, -Wpacked-not-aligned)
  43  warning-1 += $(call cc-disable-warning, missing-field-initializers)
  44  warning-1 += $(call cc-disable-warning, sign-compare)
  45