building on macOS 14

[Alan Snyder]

As you may know, a JDK built on macOS 14 using the macOS 14 SDK crashes during initialization of AWT.

(The problem appears to be Apple’s bug. It is triggered by a runtime check that is enabled only in programs that were linked against the macOS 14 SDK.)

So I tried to build JDK using the macOS 13 SDK (specifically, I was building jdk21u).

I tried both suggestions in the build documentation for configuring the Xcode version.

The first suggestion was to use xcode-select to select the previous version of Xcode (version 14), which contains the macOS 13 SDK.

This suggestion is ugly because Xcode 14 does not run on macOS 14, but it might have worked.

However, the suggestion failed because I started getting warnings like this:

"The shared archive file was created by a different version or build of HotSpot”

Even worse, however, is that these warnings *were inserted in generated Java sources*, causing the build to fail.

For example:

package sun.awt;
public class AWTIcon32_security_icon_interim16_png {
public static int[] security_icon_interim16_png = { 
[0.016s][warning][cds] The shared archive file was created by a different version or build of HotSpot
...

I then tried the second suggestion, configuring with --with-toolchain-path=/Applications/Xcode14.app/Contents/Developer/usr/bin.

This appears to work.