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Build ID: eclipse-cpp-indigo-SR1-win32 package on Win7 host MinGW download installed into C:\MinGW I created the ANSI C sample for gcc, added 3 *.c files and specified some file-level build properties (-D symbols mostly). I did some minor refactoring (move a file), and deleted a file outside Eclipse (then performed refresh). Performed some builds in between. I also opened the .cproject file in an editor but didn't modify it. When closing the project, I saw below traceback, after I was asked whether I'd want to save the .cproject file: java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(Unknown Source) at java.util.ArrayList$Itr.next(Unknown Source) at org.eclipse.cdt.managedbuilder.internal.core.ToolChain.setDirty(ToolChain.java:1618) at org.eclipse.cdt.managedbuilder.internal.core.FolderInfo.setDirty(FolderInfo.java:466) at org.eclipse.cdt.managedbuilder.internal.core.Configuration.setDirty(Configuration.java:1703) at org.eclipse.cdt.managedbuilder.internal.core.Configuration.<init>(Configuration.java:453) at org.eclipse.cdt.managedbuilder.internal.dataprovider.ConfigurationDataProvider.load(ConfigurationDataProvider.java:366) at org.eclipse.cdt.managedbuilder.internal.dataprovider.ConfigurationDataProvider.loadConfiguration(ConfigurationDataProvider.java:541) at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.loadData(CProjectDescriptionManager.java:1115) at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.loadData(CConfigurationDescriptionCache.java:95) at org.eclipse.cdt.internal.core.settings.model.CProjectDescription.loadDatas(CProjectDescription.java:196) at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.loadProjectDescription(XmlProjectDescriptionStorage.java:486) at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:231) at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:416) at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:398) at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:393) at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:386) at org.eclipse.cdt.core.model.CoreModel.getProjectDescription(CoreModel.java:1424) at org.eclipse.cdt.internal.core.index.IndexFactory.safeAddProvidedFragments(IndexFactory.java:210) at org.eclipse.cdt.internal.core.index.IndexFactory.getWritableIndex(IndexFactory.java:106) at org.eclipse.cdt.internal.core.pdom.PDOMManager.getWritableIndex(PDOMManager.java:1166) at org.eclipse.cdt.internal.core.pdom.indexer.PDOMIndexerTask.createIndex(PDOMIndexerTask.java:216) at org.eclipse.cdt.internal.core.pdom.AbstractIndexerTask.runTask(AbstractIndexerTask.java:339) at org.eclipse.cdt.internal.core.pdom.indexer.PDOMIndexerTask.run(PDOMIndexerTask.java:127) at org.eclipse.cdt.internal.core.pdom.PDOMIndexerJob.run(PDOMIndexerJob.java:137) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)