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From: Sergey Shinderuk <s.shinderuk@postgrespro.ru>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: pg_preadv() and pg_pwritev()
Date: Fri, 15 Jan 2021 05:04:48 +0300
Message-ID: <fc610391-a95d-aae5-8347-4919f97cdb49@postgrespro.ru> (raw)
In-Reply-To: <7848499f-488e-4402-a5d5-e1395efca523@postgrespro.ru>
References: <CA+hUKGJA+u-220VONeoREBXJ9P3S94Y7J+kqCnTYmahvZJwM=g@mail.gmail.com>
	<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>
	<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>
	<d90658e6-490e-db57-cd64-98868abe79cd@postgrespro.ru>
	<1410650.1610638974@sss.pgh.pa.us>
	<b2586af5-866f-8290-f068-046fbd1a01b8@postgrespro.ru>
	<1418166.1610647514@sss.pgh.pa.u! s>
	<1419199.1610649100@sss.pgh.pa.us>
	<1612230.1610662425@sss.pgh.pa.us>
	<7848499f-488e-4402-a5d5-e1395efca523@postgrespro.ru>

On 15.01.2021 04:53, Sergey Shinderuk wrote:

> I see that "xcrun --sdk macosx --show-sdk-path" really calls
> "/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk 
> macosx -version Path" under the hood.
> 

... and caches the result. xcodebuild not called without --no-cache.
So it still make sense to fall back on xcodebuild.

% sudo dtrace -n 'pid$target::popen:entry { trace(copyinstr(arg0)) }' -c 
'xcrun --sdk macosx --show-sdk-path'
dtrace: description 'pid$target::popen:entry ' matched 1 probe
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk
dtrace: pid 26981 has exited





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  To: pgsql-hackers@postgresql.org
  Cc: s.shinderuk@postgrespro.ru, tgl@sss.pgh.pa.us, thomas.munro@gmail.com
  Subject: Re: pg_preadv() and pg_pwritev()
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