I can try doing that build locally on macOS, I have a 10.15 SDK in `/Applications/Xcode-beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/`. Don't know if that will automatically make things work when cross-compiling from Linux though.
Bug 1475652 Comment 25 Edit History
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I can try doing that build locally on macOS, I have a 10.15 SDK in `/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/`. Don't know if that will automatically make things work when cross-compiling from Linux though.