Subject: Re: pg_preadv() and pg_pwritev()
To: Thomas Munro <thomas.munro@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
References: 
 <CA+hUKGJA+u-220VONeoREBXJ9P3S94Y7J+kqCnTYmahvZJwM=g@mail.gmail.com>
 <341497.1608420857@sss.pgh.pa.us>
 <CA+hUKG+7UHOH2VGRwvJZ=vXUH9pRA-Tp3gP9EHgtjwzjyfOpWg@mail.gmail.com>
 <20201220224040.evr5pduibvm6dze5@alap3.anarazel.de>
 <CA+hUKG+TCoareSYcAu05yaMh9eUck6Hd8FQZt5VEvotNs3YOMQ@mail.gmail.com>
 <CA+hUKGJ8Ww_fjzUzthdxUF6W3JQ3r=a1hWX7Fcfq9uEndZ_+GQ@mail.gmail.com>
 <CA+hUKGL9XFxM0ZO8ZADYJepSmjywknhnDkKSEttfmn2j9fg0BQ@mail.gmail.com>
 <ed3b8e5d-0da8-6ebd-fd1c-e0ac80a4b204@postgrespro.ru>
 <CA+hUKG+L573j4=XWv6S+r-687Yxn0FyXhtObH9_P-Nu_atL2pQ@mail.gmail.com>
From: Sergey Shinderuk <s.shinderuk@postgrespro.ru>
Message-ID: <448b3cb5-0ba0-6dc5-63c7-789e4eebc40b@postgrespro.ru>
Date: Wed, 13 Jan 2021 13:17:36 +0300
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0)
 Gecko/20100101 Thunderbird/78.6.1
MIME-Version: 1.0
In-Reply-To: 
 <CA+hUKG+L573j4=XWv6S+r-687Yxn0FyXhtObH9_P-Nu_atL2pQ@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

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.