lkml.org 
[lkml]   [2022]   [Mar]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/3] Kbuild: use -std=gnu11 for KBUILD_USERCFLAGS
Date
From: Arnd Bergmann <arnd@arndb.de>

As we change the C language standard for the kernel from gnu89 to
gnu11, it makes sense to also update the version for user space
compilation.

Some users have older native compilers than what they use for
kernel builds, so I considered using gnu99 as the default version
for wider compatibility with gcc-4.6 and earlier.

However, testing with older compilers showed that we already require
HOSTCC version 5.1 as well because a lot of host tools include
linux/compiler.h that uses __has_attribute():

CC tools/objtool/exec-cmd.o
In file included from tools/include/linux/compiler_types.h:36:0,
from tools/include/linux/compiler.h:5,
from exec-cmd.c:2:
tools/include/linux/compiler-gcc.h:19:5: error: "__has_attribute" is not defined [-Werror=undef]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 37ef6a555dcd..7c9be7f1ccd4 100644
--- a/Makefile
+++ b/Makefile
@@ -432,7 +432,7 @@ HOSTCXX = g++
endif

export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
- -O2 -fomit-frame-pointer -std=gnu89 \
+ -O2 -fomit-frame-pointer -std=gnu11 \
-Wdeclaration-after-statement
export KBUILD_USERLDFLAGS :=

--
2.29.2
\
 
 \ /
  Last update: 2022-03-01 15:54    [W:0.209 / U:0.804 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site