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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Sergey Shinderuk <s.shinderuk@postgrespro.ru>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: pg_preadv() and pg_pwritev()
Date: Wed, 13 Jan 2021 13:20:46 -0500
Message-ID: <1297389.1610562046@sss.pgh.pa.us> (raw)
In-Reply-To: <1286060.1610558607@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>
	<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>

Hmmm ... I can further report that on Catalina + Xcode 12.0,
everything seems fine.  configure correctly detects that preadv
and pwritev aren't there:

configure:15161: checking for preadv
configure:15161: ccache gcc -o conftest -Wall -Wmissing-prototypes -Wpointer-ar\
ith -Wdeclaration-after-statement -Werror=vla -Wendif-labels -Wmissing-format-a\
ttribute -Wformat-security -fno-strict-aliasing -fwrapv -Wno-unused-command-lin\
e-argument -g -O2 -isysroot /Applications/Xcode.app/Contents/Developer/Platform\
s/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk   -isysroot /Applications/Xcod\
e.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.s\
dk   conftest.c -lz  -lm  >&5
Undefined symbols for architecture x86_64:
  "_preadv", referenced from:
      _main in conftest-fca7e9.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
configure:15161: $? = 1

So I'm a little confused as to why this test is failing to fail
with (I assume) newer Xcode.  Can we see the relevant part of
config.log on your machine?

			regards, tom lane





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