Re: pg_preadv() and pg_pwritev()

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

Hmm.  I found something odd on my wife's Mac: although on my other
machines, I get something like

$ xcrun --verbose --no-cache --show-sdk-path
xcrun: note: looking up SDK with '/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk-version PlatformPath' 
xcrun: note: PATH =
'/Users/tgl/testversion/bin:/usr/local/autoconf-2.69/bin:/Users/tgl/bin:/usr/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/Library/Apple/usr/bin:/Library/Tcl/bin:/opt/X11/bin'
xcrun: note: SDKROOT = '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk'
xcrun: note: TOOLCHAINS = ''
xcrun: note: DEVELOPER_DIR = '/Applications/Xcode.app/Contents/Developer'
xcrun: note: XCODE_DEVELOPER_USR_PATH = ''
xcrun: note: xcrun_db = '/var/folders/3p/2bnrmypd17jcqbtzw79t9blw0000gn/T/xcrun_db'
xcrun: note: lookup resolved to: '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform'
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk

on her machine there's no detail at all:

% xcrun --verbose --no-cache --show-sdk-path
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk

So I'm not sure what to make of that.  But I'm hesitant to assume
that xcrun is just a wrapper around xcodebuild.

            regards, tom lane