44 lines
1.6 KiB
Diff
44 lines
1.6 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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--- a/Makefile
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+++ b/Makefile
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@@ -423,7 +423,7 @@ 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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