build.core preferences in boards.txt has to be in top-level board preference, not a menu-specific preference.

[damellis]

This is for the lib-1.5-cores branch. For example, "attiny.build.core=arduino:arduino" works but "attiny.menu.cpu.attiny45.build.core=arduino:arduino" doesn't. You get the following exception:

 [exec] [LaunchRunner Error] processing.app.Base.main(String[]) threw an exception:
 [exec] java.lang.NullPointerException
 [exec]     at processing.app.debug.TargetBoard.<init>(TargetBoard.java:41)
 [exec]     at processing.app.debug.TargetPlatform.<init>(TargetPlatform.java:91)
 [exec]     at processing.app.debug.TargetPackage.<init>(TargetPackage.java:50)
 [exec]     at processing.app.Base.loadHardware(Base.java:1686)
 [exec]     at processing.app.Base.<init>(Base.java:291)
 [exec]     at processing.app.Base.main(Base.java:206)
 [exec]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 [exec]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 [exec]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 [exec]     at java.lang.reflect.Method.invoke(Method.java:597)
 [exec]     at apple.launcher.LaunchRunner.run(LaunchRunner.java:116)
 [exec]     at apple.launcher.LaunchRunner.callMain(LaunchRunner.java:51)
 [exec]     at apple.launcher.JavaApplicationLauncher.launch(JavaApplicationLauncher.java:52)
 [exec] Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
 [exec]     at processing.app.Base.handleQuit(Base.java:949)
 [exec]     at processing.app.macosx.ThinkDifferent.handleQuit(ThinkDifferent.java:122)
 [exec]     at com.apple.eawt._AppEventLegacyHandler$7.dispatchEvent(_AppEventLegacyHandler.java:146)
 [exec]     at com.apple.eawt._AppEventLegacyHandler.sendEventToEachListenerUntilHandled(_AppEventLegacyHandler.java:168)
 [exec]     at com.apple.eawt._AppEventLegacyHandler.handleQuitRequestWith(_AppEventLegacyHandler.java:144)
 [exec]     at com.apple.eawt._AppEventHandler$_QuitDispatcher.performUsing(_AppEventHandler.java:387)
 [exec]     at com.apple.eawt._AppEventHandler$_QuitDispatcher.performUsing(_AppEventHandler.java:380)
 [exec]     at com.apple.eawt._AppEventHandler$_AppEventDispatcher$1.run(_AppEventHandler.java:489)
 [exec]     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
 [exec]     at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:708)
 [exec]     at java.awt.EventQueue.access$400(EventQueue.java:82)
 [exec]     at java.awt.EventQueue$2.run(EventQueue.java:669)
 [exec]     at java.awt.EventQueue$2.run(EventQueue.java:667)
 [exec]     at java.security.AccessController.doPrivileged(Native Method)
 [exec]     at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
 [exec]     at java.awt.EventQueue.dispatchEvent(EventQueue.java:678)
 [exec]     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
 [exec]     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
 [exec]     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
 [exec]     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
 [exec]     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
 [exec]     at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

[cmaglie]

Having the build.core value in the top level guarantees that a board is paired with only one core (in other words this guarantees that you can't change core from sub-menus).

Theoretically this is not mandatory, but allows us to place the board (on the Boards menu) under the referenced platform, for example your ATTiny board will appear under "Arduino AVR Boards". If we allow to change core in sub-menus, instead, the board must will be placed on a "random" position inside the Boards menu.

Both approaches works for me. Probably allowing to change the core on sub-menus gives more flexibility.

C

[cmaglie]

Fixed on 1d89e86