linux-kernel - Re: [PATCH] x86: compile boot code with -std=gnu11 too

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Date:   Wed, 27 Sep 2023 16:05:04 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>
CC:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: compile boot code with -std=gnu11 too

On September 27, 2023 8:42:11 AM PDT, Alexey Dobriyan <adobriyan@...il.com> wrote:
>Use -std=gnu11 for consistency with main kernel code.
>
>It doesn't seem to change anything in vmlinux.
>
>Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
>---
>
> arch/x86/Makefile |    2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>--- a/arch/x86/Makefile
>+++ b/arch/x86/Makefile
>@@ -43,7 +43,7 @@ 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)

Acked-by: H. Peter Anvin (Intel) <hpa@...or.com>