69 lines
2.5 KiB
Diff
69 lines
2.5 KiB
Diff
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From 51b97e354ba9fce1890cf38ecc754aa49677fc89 Mon Sep 17 00:00:00 2001
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From: "Kirill A. Shutemov" <kirill@shutemov.name>
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Date: Mon, 20 Oct 2014 12:23:12 +0300
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Subject: kernel: use the gnu89 standard explicitly
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From: "Kirill A. Shutemov" <kirill@shutemov.name>
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commit 51b97e354ba9fce1890cf38ecc754aa49677fc89 upstream.
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Sasha Levin reports:
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"gcc5 changes the default standard to c11, which makes kernel build
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unhappy
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Explicitly define the kernel standard to be gnu89 which should keep
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everything working exactly like it was before gcc5"
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There are multiple small issues with the new default, but the biggest
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issue seems to be that the old - and very useful - GNU extension to
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allow a cast in front of an initializer has gone away.
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Patch updated by Kirill:
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"I'm pretty sure all gcc versions you can build kernel with supports
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-std=gnu89. cc-option is redunrant.
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We also need to adjust HOSTCFLAGS otherwise allmodconfig fails for me"
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Note by Andrew Pinski:
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"Yes it was reported and both problems relating to this extension has
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been added to gnu99 and gnu11. Though there are other issues with the
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kernel dealing with extern inline have different semantics between
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gnu89 and gnu99/11"
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End result: we may be able to move up to a newer stdc model eventually,
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but right now the newer models have some annoying deficiencies, so the
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traditional "gnu89" model ends up being the preferred one.
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Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
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Singed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
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Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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Makefile | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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--- a/Makefile
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+++ b/Makefile
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@@ -242,7 +242,7 @@ CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
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HOSTCC = gcc
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HOSTCXX = g++
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-HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
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+HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
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HOSTCXXFLAGS = -O2
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# Decide whether to build built-in, modular, or both.
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@@ -380,8 +380,9 @@ KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
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-Wno-implicit-function-declaration \
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-Wno-format-security \
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-fno-delete-null-pointer-checks \
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- -fdiagnostics-show-option
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-
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+ -fdiagnostics-show-option \
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+ -std=gnu89
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+
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KBUILD_AFLAGS_KERNEL :=
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KBUILD_CFLAGS_KERNEL :=
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KBUILD_AFLAGS := -D__ASSEMBLY__
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