Add some pdp11 target hook definitions for C++

    * config/pdp11/pdp11.c (TARGET_CXX_GUARD_TYPE): Define.
    (TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT): Define.
    (TARGET_CXX_LIBRARY_RTTI_COMDAT): Define.
    (pdp11_guard_type): New function.

From-SVN: r264883

gcc/ChangeLog

 2018-10-05  Paul Koning  <ni1d@arrl.net>
 
+	* config/pdp11/pdp11.c (TARGET_CXX_GUARD_TYPE): Define.
+	(TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT): Define.
+	(TARGET_CXX_LIBRARY_RTTI_COMDAT): Define.
+	(pdp11_guard_type): New function.
+
+2018-10-05  Paul Koning  <ni1d@arrl.net>
+
 	* config/pdp11/pdp11.h (FLOAT_TYPE_SIZE): Always 32.
 	* config/pdp11/pdp11.opt (mfloat32): Remove.
 	(mfloat64): Remove.

gcc/config/pdp11/pdp11.c

@@ -292,6 +292,15 @@ static bool pdp11_scalar_mode_supported_p (scalar_mode);
 #undef TARGET_INVALID_WITHIN_DOLOOP
 #define TARGET_INVALID_WITHIN_DOLOOP hook_constcharptr_const_rtx_insn_null
 
+#undef  TARGET_CXX_GUARD_TYPE
+#define TARGET_CXX_GUARD_TYPE pdp11_guard_type
+
+#undef  TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT
+#define TARGET_CXX_CLASS_DATA_ALWAYS_COMDAT hook_bool_void_false
+
+#undef  TARGET_CXX_LIBRARY_RTTI_COMDAT
+#define TARGET_CXX_LIBRARY_RTTI_COMDAT hook_bool_void_false
+
 #undef TARGET_HAVE_SPECULATION_SAFE_VALUE
 #define TARGET_HAVE_SPECULATION_SAFE_VALUE speculation_safe_value_not_needed
 
@@ -1702,6 +1711,13 @@ pdp11_can_change_mode_class (machine_mode from,
   return !reg_classes_intersect_p (FPU_REGS, rclass);
 }
 
+/* Implement TARGET_CXX_GUARD_TYPE */
+static tree
+pdp11_guard_type (void)
+{
+  return short_integer_type_node;
+}
+
 /* TARGET_PREFERRED_RELOAD_CLASS
 
    Given an rtx X being reloaded into a reg required to be