Index 0 out of bounds for length 0 when applying project properties after change to cross compiler #1300
Description
Describe the bug
When the user changes the current toolchain to a cross compiler toolchain without pressing the Apply button:
and then tries to set the Prefix and Path option in the C/C++ Build Settings page:
To Reproduce
See bug description.
Expected behavior
No exception should occur.
Version Information (please complete the following information):
- OS and OS Version/extra details: Windows 11
- Eclipse Version from Help -> 2025-09
- CDT Version from Help -> Current master on commit 8786db3
Additional context
!ENTRY org.eclipse.cdt.ui 4 4 2025-09-10 16:27:13.102
!MESSAGE Internal error
!STACK 0
java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
at org.eclipse.cdt.managedbuilder.ui.properties.ToolSettingsTab.copyHoldsOptions(ToolSettingsTab.java:550)
at org.eclipse.cdt.managedbuilder.ui.properties.ToolSettingsTab.performApply(ToolSettingsTab.java:753)
at org.eclipse.cdt.ui.newui.AbstractCPropertyTab.handleTabEvent(AbstractCPropertyTab.java:624)
at org.eclipse.cdt.ui.newui.AbstractPage.forEach(AbstractPage.java:1109)
at org.eclipse.cdt.ui.newui.AbstractPage$5.run(AbstractPage.java:695)
at org.eclipse.ui.actions.WorkspaceModifyDelegatingOperation.execute(WorkspaceModifyDelegatingOperation.java:71)
at org.eclipse.ui.actions.WorkspaceModifyOperation.lambda$0(WorkspaceModifyOperation.java:112)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2505)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2533)
at org.eclipse.ui.actions.WorkspaceModifyOperation.run(WorkspaceModifyOperation.java:131)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:433)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:353)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:470)
at org.eclipse.ui.internal.progress.ProgressManager$RunnableWithStatus.run(ProgressManager.java:1105)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.ui.internal.progress.ProgressManager.lambda$27(ProgressManager.java:985)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:183)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:133)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4894)
at org.eclipse.ui.internal.progress.ProgressManager.runInUI(ProgressManager.java:985)
at org.eclipse.cdt.ui.newui.AbstractPage.performSave(AbstractPage.java:714)
at org.eclipse.cdt.ui.newui.AbstractPage.performApply(AbstractPage.java:562)
at org.eclipse.jface.preference.PreferencePage.lambda$1(PreferencePage.java:289)
at org.eclipse.swt.events.SelectionListener$1.widgetSelected(SelectionListener.java:83)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:286)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1214)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4160)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3748)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:823)
at org.eclipse.jface.window.Window.open(Window.java:799)
at org.eclipse.ui.dialogs.PropertyDialogAction.run(PropertyDialogAction.java:154)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:474)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:581)
at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:415)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1214)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4160)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3748)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:678)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:583)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:185)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:219)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:149)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:115)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:467)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:298)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:627)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1431)
at org.eclipse.equinox.launcher.Main.main(Main.java:1403)