[V3 21/36] [SFrame-V3] gas: sframe: add new backend hook sframe_support_flex_fde_p for FLEX FDEs

[Jan Beulich]

On 13.01.2026 12:12, Indu Bhagat wrote:
> --- a/gas/config/tc-aarch64.c
> +++ b/gas/config/tc-aarch64.c
> @@ -9282,6 +9282,14 @@ aarch64_sframe_ra_tracking_p (void)
>    return true;
>  }
>  
> +/* Whether SFrame FDE of type SFRAME_FDE_TYPE_FLEX be generated.  */
> +
> +bool
> +aarch64_support_flex_fde_p (void)
> +{
> +  return false;
> +}

Why a full-fledged function when ...

> --- a/gas/config/tc-aarch64.h
> +++ b/gas/config/tc-aarch64.h
> @@ -339,6 +339,10 @@ extern offsetT aarch64_sframe_cfa_ra_offset (void);
>  unsigned char aarch64_sframe_get_abi_arch (void);
>  #define sframe_get_abi_arch aarch64_sframe_get_abi_arch
>  
> +/* Whether SFrame FDE of type SFRAME_FDE_TYPE_FLEX be generated.  */
> +extern bool aarch64_support_flex_fde_p (void);
> +#define sframe_support_flex_fde_p aarch64_support_flex_fde_p

... this could simply evaluate to false? By making the "false" visible to
the compiler at the use sites, you'd offer it DCE opportunities even without
LTO.

Jan