infinite recursion with ada_check_typedef

When trying to resolve an incomplete type, if there is no complete
version of that type available, GDB can go in an infinite loop.

This is because ada_check_typedef makes a recursive call to itself,
in an attempt to make sure that the returned type is never a typedef.
However, when no complete type is found, the current logic causes us
to keep going indefinitely through the same path...

This patch fixes the problem by performing the recursive call to
ada_check_typedef only when a TYPE_CODE_TYPDEF layer needs to be
stripped.

gdb/ChangeLog:

        * ada-lang.c (ada_check_typedef): Call ada_check_typedef only
        if type1 is a typedef.

1 files changed, 6 insertions, 4 deletions

diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c
index 76b20e7..15c96b7 100644
--- a/gdb/ada-lang.c
+++ b/gdb/ada-lang.c
@@ -7756,10 +7756,12 @@ ada_check_typedef (struct type *type)
 
       /* TYPE1 might itself be a TYPE_CODE_TYPEDEF (this can happen with
 	 stubs pointing to arrays, as we don't create symbols for array
-	 types, only for the typedef-to-array types).  This is why
-	 we process TYPE1 with ada_check_typedef before returning
-	 the result.  */
-      return ada_check_typedef (type1);
+	 types, only for the typedef-to-array types).  If that's the case,
+	 strip the typedef layer.  */
+      if (TYPE_CODE (type1) == TYPE_CODE_TYPEDEF)
+	type1 = ada_check_typedef (type1);
+
+      return type1;
     }
 }