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Upstream has switched to gnu11 not too long ago. One advantage of backporting this to these older kernels is, that we can encourage and write better upstreamable kernels. E.g. the kernel devs prefer loop declarations. Shrinking the master/local gap will be useful in these cases. Signed-off-by: Olliver Schinagl <oliver@schinagl.nl> Acked-by: Christian Marangi <ansuelsmth@gmail.com>
48 lines
1.7 KiB
Diff
48 lines
1.7 KiB
Diff
From 40337d6f3d677aee7ad3052ae662d3f53dd4d5cb Mon Sep 17 00:00:00 2001
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From: Arnd Bergmann <arnd@arndb.de>
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Date: Tue, 8 Mar 2022 22:56:15 +0100
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Subject: [PATCH 3/3] Kbuild: use -std=gnu11 for KBUILD_USERCFLAGS
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As we change the C language standard for the kernel from gnu89 to
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gnu11, it makes sense to also update the version for user space
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compilation.
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Some users have older native compilers than what they use for
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kernel builds, so I considered using gnu99 as the default version
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for wider compatibility with gcc-4.6 and earlier.
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However, testing with older compilers showed that we already require
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HOSTCC version 5.1 as well because a lot of host tools include
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linux/compiler.h that uses __has_attribute():
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CC tools/objtool/exec-cmd.o
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In file included from tools/include/linux/compiler_types.h:36:0,
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from tools/include/linux/compiler.h:5,
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from exec-cmd.c:2:
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tools/include/linux/compiler-gcc.h:19:5: error: "__has_attribute" is not defined [-Werror=undef]
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Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Reviewed-by: Nathan Chancellor <nathan@kernel.org>
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Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
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Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
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Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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---
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Makefile | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/Makefile b/Makefile
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index fe86758acaaa..e569fccfb009 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -416,7 +416,7 @@ HOSTCXX = g++
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endif
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export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
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- -O2 -fomit-frame-pointer -std=gnu89 \
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+ -O2 -fomit-frame-pointer -std=gnu11 \
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-Wdeclaration-after-statement
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export KBUILD_USERLDFLAGS :=
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--
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2.37.2
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