Re: pg_preadv() and pg_pwritev()

On Wed, Jan 13, 2021 at 10:40 PM Sergey Shinderuk
<s.shinderuk@postgrespro.ru> wrote:
>
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk/usr/include/sys/uio.h:104:9:
> note: 'pwritev' has been marked as being introduced in macOS 11.0 here,
> but the deployment target is macOS
>        10.15.0
> ssize_t pwritev(int, const struct iovec *, int, off_t)
> __DARWIN_NOCANCEL(pwritev) __API_AVAILABLE(macos(11.0), ios(14.0),
> watchos(7.0), tvos(14.0));
>          ^

Hrm...  So why did "configure" think you have pwritev, then?  It seems
like you must have been using different compilers or options at
configure time and compile time, no?