[Buildroot] [PATCH 4/9] arch/arm: do not allow soft-float for armv8a

Yann E. MORIN yann.morin.1998 at free.fr
Mon Sep 4 17:21:37 UTC 2017


Thomas, All,

On 2017-09-03 15:17 +0200, Yann E. MORIN spake thusly:
> armv8a has made VFPv4 and NEON mandatory, so there is no point in
> allowing software floating point, even in 32-bit mode.

In fact, even though I'm pretty sure that OK in 64-bit, we might still
have a reason to do soft-float in 32-bit mode, if only for legacy
binary-only applications that were built as soft-float way back in the
(not so) good old days...

In which case, we should instead depend on !BR2_ARCH_IS_64.

Thoughts?

Regards,
Yann E. MORIN.

> Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
> Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> ---
>  arch/Config.in.arm | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/Config.in.arm b/arch/Config.in.arm
> index d110d52e2d..0ae6a16a0a 100644
> --- a/arch/Config.in.arm
> +++ b/arch/Config.in.arm
> @@ -374,6 +374,7 @@ choice
>  config BR2_ARM_SOFT_FLOAT
>  	bool "Soft float"
>  	depends on BR2_ARM_EABI
> +	depends on !BR2_ARM_CPU_ARMV8A
>  	select BR2_SOFT_FLOAT
>  	help
>  	  This option allows to use software emulated floating
> -- 
> 2.11.0
> 

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