From: Tom Lane <tgl@sss.pgh.pa.us>
To: Sergey Shinderuk <s.shinderuk@postgrespro.ru>
cc: Thomas Munro <thomas.munro@gmail.com>,
        pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: pg_preadv() and pg_pwritev()
In-reply-to: <1418166.1610647514@sss.pgh.pa.us>
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>
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 <ed3b8e5d-0da8-6ebd-fd1c-e0ac80a4b204@postgrespro.ru>
 <CA+hUKG+L573j4=XWv6S+r-687Yxn0FyXhtObH9_P-Nu_atL2pQ@mail.gmail.com>
 <448b3cb5-0ba0-6dc5-63c7-789e4eebc40b@postgrespro.ru>
 <1283127.1610554395@sss.pgh.pa.us> <1286060.1610558607@sss.pgh.pa.us>
 <1297389.1610562046@sss.pgh.pa.us> <1341608.1610580122@sss.pgh.pa.us>
 <c2e08e38-e4bd-780d-62df-4a33b537b75e@postgrespro.ru>
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 <1410650.1610638974@sss.pgh.pa.us>
 <b2586af5-866f-8290-f068-046fbd1a01b8@postgrespro.ru>
 <1418166.1610647514@sss.pgh.pa.u!
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Comments: In-reply-to Tom Lane <tgl@sss.pgh.pa.us>
	message dated "Thu, 14 Jan 2021 13:05:14 -0500"
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Date: Thu, 14 Jan 2021 13:31:40 -0500
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I wrote:
> It seems like the more productive approach would be to try to identify
> the right sysroot to use.  I wonder if there is some less messy way
> to find out the compiler's default sysroot than to scrape it out of
> -v output.

This is, of course, not terribly well documented by Apple.  But
Mr. Google suggests that "xcrun --show-sdk-path" might serve.
What does that print for you?

			regards, tom lane