re PR bootstrap/42812 (--enable-build-with-cxx bootstrap fails on fortran/resolve.c:gfc_resolve)

	PR bootstrap/42812
	* gfortran.h  (struct gfc_namespace) <resolved>: Change to signed
	bitfield of width 2.

From-SVN: r156062

gcc/fortran/ChangeLog

@@ -3,6 +3,10 @@
 	* module.c (mio_f2k_derived): Use enumerator as initializer of
 	enum variable.
 
+	PR bootstrap/42812
+	* gfortran.h  (struct gfc_namespace) <resolved>: Change to signed
+	bitfield of width 2.
+
 2010-01-19  Janus Weil  <janus@gcc.gnu.org>
 
 	PR fortran/42804

gcc/fortran/gfortran.h

@@ -1372,8 +1372,9 @@ typedef struct gfc_namespace
   /* Set to 1 if namespace is an interface body with "IMPORT" used.  */
   unsigned has_import_set:1;
 
-  /* Set to 1 if resolved has been called for this namespace.  */
-  unsigned resolved:1;
+  /* Set to 1 if resolved has been called for this namespace.
+     Holds -1 during resolution.  */
+  signed resolved:2;
 
   /* Set to 1 if code has been generated for this namespace.  */
   unsigned translated:1;