Use launch configuration environment attributes in Core Build local d…

…ebug.

The Core Build local debug launch uses the environment attributes from
the new environment tab that was added in eclipse-cdt#901.

dsf-gdb/org.eclipse.cdt.dsf.gdb/META-INF/MANIFEST.MF

@@ -3,7 +3,7 @@ Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-Vendor: %providerName
 Bundle-SymbolicName: org.eclipse.cdt.dsf.gdb;singleton:=true
-Bundle-Version: 7.1.300.qualifier
+Bundle-Version: 7.1.400.qualifier
 Bundle-Activator: org.eclipse.cdt.dsf.gdb.internal.GdbPlugin
 Bundle-Localization: plugin
 Require-Bundle: org.eclipse.core.runtime,

dsf-gdb/org.eclipse.cdt.dsf.gdb/src/org/eclipse/cdt/dsf/gdb/internal/launching/CoreBuildLocalDebugLaunchDelegate.java

@@ -40,6 +40,7 @@
 import org.eclipse.debug.core.DebugException;
 import org.eclipse.debug.core.ILaunch;
 import org.eclipse.debug.core.ILaunchConfiguration;
+import org.eclipse.debug.core.ILaunchManager;
 import org.eclipse.launchbar.core.target.ILaunchTarget;
 import org.eclipse.launchbar.core.target.launch.ITargetedLaunch;
 
@@ -81,6 +82,14 @@ public void launch(ILaunchConfiguration configuration, String mode, ILaunch laun
 		envProps.putAll(buildEnv);
 		gdbLaunch.setInitialEnvironment(envProps);
 
+		// Override initial environment by launch configuration attributes.
+		Map<String, String> launchEnvironment = configuration.getAttribute(ILaunchManager.ATTR_ENVIRONMENT_VARIABLES,
+				new HashMap<>());
+		if (!configuration.getAttribute(ILaunchManager.ATTR_APPEND_ENVIRONMENT_VARIABLES, true)) {
+			envProps.clear();
+		}
+		envProps.putAll(launchEnvironment);
+
 		IToolChain toolChain = buildConfig.getToolChain();
 		Path gdbPath = toolChain.getCommandPath(Paths.get("gdb")); //$NON-NLS-1$
 		gdbLaunch.setGDBPath(gdbPath != null ? gdbPath.toString() : "gdb"); //$NON-NLS-1$