Re: pg_preadv() and pg_pwritev()

On 13.01.2021 12:56, Thomas Munro wrote:
> 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?
> 

No, i've just rerun configure from clean checkout without any options. 
It does think that pwritev is available. I'll try to figure this out 
later and come back to you. Thanks.