GP-6494 fix DWARF handling of static global variables in a namespace

Logic used to decide if variable was a function-scoped variable was too
simplistic and couldn't handle static global variables created by clang.

Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DIEAggregate.java

@@ -267,6 +267,21 @@ public class DIEAggregate {
 		return getDIEContainer().getAggregate(parent);
 	}
 
+	/**
+	 * Returns the first ancestor (parent, grandparent, etc) that matches the specified DIE
+	 * tag type.
+	 * 
+	 * @param ancestorType {@link DWARFTag} DIE type
+	 * @return {@link DIEAggregate} containing requested ancestor, or null if not found
+	 */
+	public DIEAggregate findAncestor(DWARFTag ancestorType) {
+		DIEAggregate parent = getParent();
+		while (parent != null && parent.getTag() != ancestorType) {
+			parent = parent.getParent();
+		}
+		return parent;
+	}
+
 	/**
 	 * Returns the depth of the head fragment, where depth is defined as
 	 * the distance between the DIE and the root DIE of the owning compilation

Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFFunctionImporter.java

@@ -15,6 +15,7 @@
  */
 package ghidra.app.util.bin.format.dwarf;
 
+import static ghidra.app.util.bin.format.dwarf.DWARFTag.*;
 import static ghidra.app.util.bin.format.dwarf.attribs.DWARFAttributeId.*;
 
 import java.io.IOException;
@@ -115,11 +116,11 @@ public class DWARFFunctionImporter {
 						}
 						break;
 					case DW_TAG_variable:
-						// only process variable definitions that are static variables
-						// (ie. they are children of the compunit root, ie. depth == 1).
-						// Local variables should be children of dw_tag_subprograms
-						// and will be handled in processFuncChildren()
-						if (diea.getDepth() == 1) {
+						// Only process variable definitions that are global static variables
+						// (not nested under a subprogram DIE)
+						// Static variables scoped inside a function should be children of 
+						// dw_tag_subprograms and will be handled in processFuncChildren()
+						if (diea.findAncestor(DW_TAG_subprogram) == null) {
 							outputGlobal(DWARFVariable.readGlobalVariable(diea));
 						}
 						break;