Re: pg_preadv() and pg_pwritev()

Sergey Shinderuk <s.shinderuk@postgrespro.ru>

From: Sergey Shinderuk <s.shinderuk@postgrespro.ru>

To: Tom Lane <tgl@sss.pgh.pa.us>, Thomas Munro <thomas.munro@gmail.com>

Cc: pgsql-hackers <pgsql-hackers@postgresql.org>

Date: 2021-01-14T07:44:12Z

Lists: pgsql-hackers

>> The symptoms sound consistent with using bleeding-edge Xcode on a
>> Catalina machine ... please report exact OS and Xcode versions.
> 
> macOS 10.15.7 (19H2)
> Xcode 12.3 (12C33)
> macOS SDK 11.1 (20C63)
> 

Everything is fine if I run "configure" with
PG_SYSROOT=/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk

I noticed that "cc" invoked from command line uses:
-isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk

But "xcodebuild -version -sdk macosx Path" invoked by "configure" when 
PG_SYSROOT is not provided gives:
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk

Now I'm confused about different SDK versions and locations used by 
Xcode and CommandLineTools :)

Commits

Improve our heuristic for selecting PG_SYSROOT on macOS.
- 3934543c2bb0 9.5.25 landed
- fc6d08b27a33 9.6.21 landed
- 5fa060c8f593 10.16 landed
- 046c8facecee 11.11 landed
- f5d044eaeff0 12.6 landed
- f44ae4db5fec 13.2 landed
- 4823621db312 14.0 landed
Move our p{read,write}v replacements into their own files.
- 0d56acfbaa79 14.0 landed
Don't use elog() in src/port/pwrite.c.
- df10ac625c16 14.0 landed
Use vectored I/O to fill new WAL segments.
- ce6a71fa5300 14.0 landed
Provide pg_preadv() and pg_pwritev().
- 13a021f3e8c9 14.0 landed