Re: [PATCH v3 7/7] block: check availablity for preadv/pwritev on mac

[Stefan Hajnoczi]

On Tue, Oct 27, 2020 at 08:07:01PM -0700, Joelle van Dyne wrote:
> macOS 11/iOS 14 added preadv/pwritev APIs. Due to weak linking, configure
> will succeed with CONFIG_PREADV even when targeting a lower OS version. We
> therefore need to check at run time if we can actually use these APIs.
> 
> Signed-off-by: Joelle van Dyne <j@getutm.app>
> ---
>  block/file-posix.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)

What happens when preadv() is called prior to macOS 11/iOS 14?

If I understand correctly the runtime check is preferrable because
otherwise a binary compiled on recent macOS/iOS would ship with preadv()
support but fail when executed on an older macOS/iOS?

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