(integrate_decl_tree): Set DECL_ABTRACT_ORIGIN before pushdecl call

for local variables.

From-SVN: r10102

gcc/integrate.c

@@ -1991,14 +1991,23 @@ integrate_decl_tree (let, level, map)
       if (DECL_LANG_SPECIFIC (d))
 	copy_lang_decl (d);
 
+      /* Must set DECL_ABSTRACT_ORIGIN here for local variables, to ensure
+	 that we don't get -Wshadow warnings.  But don't set it here if
+	 pushdecl might return a duplicate decl, as that will result in
+	 incorrect DWARF debug info.  */
+      if (! DECL_EXTERNAL (d) || ! TREE_PUBLIC (d))
+	/* Prevent warning for shadowing with these.  */
+	DECL_ABSTRACT_ORIGIN (d) = t;
+
       newd = pushdecl (d);
 
-      /* If the decl we get back is the copy of 't' that we started with,
+      /* If we didn't set DECL_ABSTRACT_ORIGIN above, then set it now.
+	 Simpler to just set it always rather than checking.
+	 If the decl we get back is the copy of 't' that we started with,
 	 then set the DECL_ABSTRACT_ORIGIN.  Otherwise, we must have a
 	 duplicate decl, and we got the older one back.  In that case, setting
 	 DECL_ABSTRACT_ORIGIN is not appropriate.  */
       if (newd == d)
-	/* Prevent warning for shadowing with these.  */
 	DECL_ABSTRACT_ORIGIN (d) = t;
     }