I regularly build CDT from source (since I need a patch, not good enough for upstream, for C++14 lambdas). I just hit an error with git master:
!SESSION 2016-08-20 14:22:26.415 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_101
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments: -application org.eclipse.ant.core.antRunner -buildfile customBuildCallbacks.xml build.index
Command-line arguments: -application org.eclipse.ant.core.antRunner -buildfile customBuildCallbacks.xml build.index
!ENTRY org.eclipse.osgi 4 0 2016-08-20 14:22:27.129
!MESSAGE Application error
!STACK 1
java.lang.NullPointerException: null values not allowed
at org.eclipse.core.internal.registry.ReferenceMap.put(ReferenceMap.java:351)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.getBundle(RegistryStrategyOSGI.java:151)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:166)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:191)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at org.eclipse.equinox.launcher.Main.main(Main.java:1488)
Help is appreciated.