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From: Krzysztof Mitko <invalid@kmitko.at.list.dot.pl>
Newsgroups: comp.sys.mac.system
Subject: No support for compiling 32 bit apps in Xcode 10
Date: Tue, 5 Jun 2018 09:14:45 -0000 (UTC)
Organization: Netfront http://www.netfront.net/
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From Xcode 10 beta release notes:

"Deprecation Notices

The macOS 10.14 SDK no longer contains support for compiling 32-bit 
applications. If developers need to compile for i386, Xcode 9.4 or 
earlier is required."

Mind you, this does not mean you can't run 32 bit apps in Mojave - just 
that new Xcode won't compile 32 bit apps.

-- 
Chemical engineers do it in packed beds.