(operator>>): Cast new character to char before adding to string.

(getline): Likewise.

From-SVN: r23786

libstdc++/std/bastring.cc

@@ -39,7 +39,7 @@ operator delete (void * ptr)
 {
   Allocator::deallocate(ptr, sizeof(Rep) +
 			reinterpret_cast<Rep *>(ptr)->res *
-			sizeof (charT)); 
+			sizeof (charT));
 }
 
 template <class charT, class traits, class Allocator>
@@ -450,7 +450,7 @@ operator>> (istream &is, basic_string <charT, traits, Allocator> &s)
 	      sb->sungetc ();
 	      break;
 	    }
-	  s += ch;
+	  s += static_cast<char> (ch);
 	  if (--w == 1)
 	    break;
 	}
@@ -496,7 +496,7 @@ getline (istream &is, basic_string <charT, traits, Allocator>& s, charT delim)
 	  if (ch == delim)
 	    break;
 
-	  s += ch;
+	  s += static_cast<char> (ch);
 
 	  if (s.length () == s.npos - 1)
 	    {