The latest version of Xcode that MacOS Mojave can install is 11.3.1
Later versions of Xcode no longer support MacOS Mojave
I can confirm that gcc builds if I force gmp to build with -fno-stack-check, using Xcode Version 11.2 (11B41) on macOS Catalina 10.15.1 (19B68f). (As a side note, it seems like Xcode 11.2 does not fix the stack alignment issue for gmp, at least not yet. Cannot install cocoapods on terminal macOS 10.15.7. Ask Question Asked 7 months ago. Also make sure Xcode-select and command line tools are set up correctly. The macOS 10.15 SDK provides support for developing apps for Macs running macOS Catalina 10.15. The SDK comes bundled with Xcode 11 beta available from Beta Software Downloads. For information on the compatibility requirements for Xcode 11, see Xcode 11 Beta Release Notes.
Xcode official download address, you need to log in to Apple account. After downloading, double-click to unzip the XIP file, and then drag the extracted file to the application. If you want to keep the old version, you need to rename the original version before dragging
Here are the sources and basis of the information
Check the release notes information of Xcode on the official website
- Xcode 11.3.1 Release Notes
Xcode 11.3.1 supports developing apps for iOS 13.3, iPadOS 13.3, tvOS 13.3, watchOS 6.1, and macOS Catalina 10.15.2. Xcode 11.3.1 supports on-device debugging for iOS 8 and later, tvOS 9 and later, and watchOS 2 and later. Xcode 11.3.1 requires a Mac running macOS Mojave 10.14.4 or later.
Xcode 12 Macos 10.15
The next version is 11.4
Xcode For Macos 10.15
- Xcode 11.4 Release Notes
Macos 10.15 Xcode Software
Xcode 11.4 includes SDKs for iOS 13.4, iPadOS 13.4, tvOS 13.4, watchOS 6.2, and macOS Catalina 10.15.4. The Xcode 11.4 release supports on-device debugging for iOS 8 and later, tvOS 9 and later, and watchOS 2 and later. Xcode 11.4 requires a Mac running macOS Catalina 10.15.2 or later.