Christian pointed out on irc that the threading series broke the build
on mingw.  This patch fixes the problem, by moving the initialization
of gdb_demangle_attempt_core_dump into the appropriate #if.
gdb/ChangeLog
2019-11-26  Tom Tromey  <tromey@adacore.com>
	* cp-support.c (_initialize_cp_support): Conditionally initialize
	gdb_demangle_attempt_core_dump.
Change-Id: I9ace0bea75a51f317ea933b607f6b5a94d651eea
+2019-11-26  Tom Tromey  <tromey@adacore.com>
+
+       * cp-support.c (_initialize_cp_support): Conditionally initialize
+       gdb_demangle_attempt_core_dump.
+
 2019-11-26  Tom Tromey  <tom@tromey.com>
 
        * python/py-function.c (fnpy_init): Update.
 
                           NULL,
                           &maintenance_set_cmdlist,
                           &maintenance_show_cmdlist);
+
+  gdb_demangle_attempt_core_dump = can_dump_core (LIMIT_CUR);
 #endif
 
 #if GDB_SELF_TEST
   selftests::register_test ("cp_remove_params",
                            selftests::test_cp_remove_params);
 #endif
-
-  gdb_demangle_attempt_core_dump = can_dump_core (LIMIT_CUR);
 }