From: Alexey Dobriyan <adobriyan@gmail.com>
commit b3bee1e7c3f2b1b77182302c7b2131c804175870 upstream.
Use -std=gnu11 for consistency with main kernel code.
It doesn't seem to change anything in vmlinux.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Link: https://lore.kernel.org/r/2058761e-12a4-4b2f-9690-3c3c1c9902a5@p183
[ This kernel version doesn't build with GCC 15:
In file included from include/uapi/linux/posix_types.h:5,
from include/uapi/linux/types.h:14,
from include/linux/types.h:6,
from arch/x86/realmode/rm/wakeup.h:11,
from arch/x86/realmode/rm/wakemain.c:2:
include/linux/stddef.h:11:9: error: cannot use keyword 'false' as enumeration constant
11 | false = 0,
| ^~~~~
include/linux/stddef.h:11:9: note: 'false' is a keyword with '-std=c23' onwards
include/linux/types.h:30:33: error: 'bool' cannot be defined via 'typedef'
30 | typedef _Bool bool;
| ^~~~
include/linux/types.h:30:33: note: 'bool' is a keyword with '-std=c23' onwards
include/linux/types.h:30:1: warning: useless type name in empty declaration
30 | typedef _Bool bool;
| ^~~~~~~
The fix is similar to commit ee2ab467bddf ("x86/boot: Use '-std=gnu11'
to fix build with GCC 15") which has been backported to this kernel.
Note: In < 5.18 version, -std=gnu89 is used instead of -std=gnu11, see
commit e8c07082a810 ("Kbuild: move to -std=gnu11"). I suggest not to
modify that in this commit here as all the other similar fixes to
support GCC 15 set -std=gnu11. This can be done in a dedicated commit
if needed. ]
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
---
arch/x86/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 9c09bbd390ce..d5ee0b920dc0 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -24,7 +24,7 @@ endif
# How to compile the 16-bit code. Note we always compile for -march=i386;
# that way we can complain to the user if the CPU is insufficient.
-REALMODE_CFLAGS := -m16 -g -Os -DDISABLE_BRANCH_PROFILING -D__DISABLE_EXPORTS \
+REALMODE_CFLAGS := -std=gnu11 -m16 -g -Os -DDISABLE_BRANCH_PROFILING -D__DISABLE_EXPORTS \
-Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
-fno-strict-aliasing -fomit-frame-pointer -fno-pic \
-mno-mmx -mno-sse $(call cc-option,-fcf-protection=none)
--
2.51.0