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kernel: backport a change to 4.9 which disables overly aggressive warnings on gcc 8 

Signed-off-by: Felix Fietkau <nbd@nbd.name>
master
Felix Fietkau 2018-07-22 17:05:09 +02:00
parent c527d0ec18
commit 7ad20678e5
1 changed files with 45 additions and 0 deletions
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45
target/linux/generic/backport-4.9/014-Kbuild-suppress-packed-not-aligned-warning-for-defau.patch Normal file
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@ -0,0 +1,45 @@
From: Xiongfeng Wang <xiongfeng.wang@linaro.org>
Date: Thu, 11 Jan 2018 17:22:29 +0800
Subject: [PATCH] Kbuild: suppress packed-not-aligned warning for default
setting only
gcc-8 reports many -Wpacked-not-aligned warnings. The below are some
examples.
./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
} __attribute__ ((packed));
./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
} __attribute__ ((packed));
./include/linux/ceph/msgr.h:67:1: warning: alignment 1 of 'struct
ceph_entity_addr' is less than 8 [-Wpacked-not-aligned]
} __attribute__ ((packed));
This patch suppresses this kind of warnings for default setting.
Signed-off-by: Xiongfeng Wang <xiongfeng.wang@linaro.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -10,6 +10,8 @@
# are not supported by all versions of the compiler
# ==========================================================================
+KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
+
ifeq ("$(origin W)", "command line")
export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
endif
@@ -25,6 +27,7 @@ warning-1 += -Wold-style-definition
warning-1 += $(call cc-option, -Wmissing-include-dirs)
warning-1 += $(call cc-option, -Wunused-but-set-variable)
warning-1 += $(call cc-option, -Wunused-const-variable)
+warning-1 += $(call cc-option, -Wpacked-not-aligned)
warning-1 += $(call cc-disable-warning, missing-field-initializers)
warning-1 += $(call cc-disable-warning, sign-compare)