--- a/gcc/config/rs6000/rtems.h	Thu Oct 25 07:37:49 2018 +0900
+++ b/gcc/config/rs6000/rtems.h	Thu Feb 13 11:34:05 2020 +0900
@@ -1,5 +1,5 @@
 /* Definitions for rtems targeting a PowerPC using elf.
-   Copyright (C) 1996-2018 Free Software Foundation, Inc.
+   Copyright (C) 1996-2020 Free Software Foundation, Inc.
    Contributed by Joel Sherrill (joel@OARcorp.com).
 
    This file is part of GCC.
@@ -111,14 +111,14 @@
 	  if ((rs6000_isa_flags & OPTION_MASK_POWERPC64) == 0)	\
 	    {							\
 	      rs6000_isa_flags |= OPTION_MASK_POWERPC64;	\
-	      error ("-m64 requires a PowerPC64 cpu");		\
+	      error ("%<-m64%> requires a PowerPC64 cpu");		\
 	    }							\
 	  if ((rs6000_isa_flags_explicit			\
 		& OPTION_MASK_MINIMAL_TOC) != 0)		\
 	    {							\
 	      if (global_options_set.x_rs6000_current_cmodel	\
 		  && rs6000_current_cmodel != CMODEL_SMALL)	\
-		error ("-mcmodel incompatible with other toc options"); \
+		error ("%<-mcmodel%> incompatible with other toc options"); \
 	      SET_CMODEL (CMODEL_SMALL);			\
 	    }							\
 	  else							\
@@ -222,13 +222,13 @@
 #undef  ASM_OUTPUT_SPECIAL_POOL_ENTRY_P
 #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X, MODE)			\
   (TARGET_TOC								\
-   && (GET_CODE (X) == SYMBOL_REF					\
+   && (SYMBOL_REF_P (X)							\
        || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS	\
-	   && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)		\
+	   && SYMBOL_REF_P (XEXP (XEXP (X, 0), 0)))			\
        || GET_CODE (X) == LABEL_REF					\
-       || (GET_CODE (X) == CONST_INT 					\
+       || (CONST_INT_P (X)						\
 	   && GET_MODE_BITSIZE (MODE) <= GET_MODE_BITSIZE (Pmode))	\
-       || (GET_CODE (X) == CONST_DOUBLE					\
+       || (CONST_DOUBLE_P (X)						\
 	   && ((TARGET_64BIT						\
 		&& (TARGET_MINIMAL_TOC					\
 		    || (SCALAR_FLOAT_MODE_P (GET_MODE (X))		\
@@ -254,9 +254,6 @@
 %{mcpu=8540: %{!Dppc*: %{!Dmpc*: -Dppc8540}  } } \
 %{mcpu=e6500: -D__PPC_CPU_E6500__}"
 
-#undef	ASM_DEFAULT_SPEC
-#define	ASM_DEFAULT_SPEC "-mppc%{m64:64}"
-
 #undef	ASM_SPEC
 #define	ASM_SPEC "%{!m64:%(asm_spec32)}%{m64:%(asm_spec64)} %(asm_spec_common)"
 
@@ -288,3 +285,10 @@
   { "asm_spec64",		ASM_SPEC64 },				\
   { "link_os_spec32",		LINK_OS_SPEC32 },			\
   { "link_os_spec64",		LINK_OS_SPEC64 },
+
+/* Use gnu-user.h LINK_GCC_SEQUENCE_SPEC for rtems.  */
+#undef LINK_GCC_C_SEQUENCE_SPEC
+#define	LINK_GCC_C_SEQUENCE_SPEC \
+  "%{mads|myellowknife|mmvme|msim:%G %L %G;" \
+  "!mcall-*|mcall-linux:" GNU_USER_TARGET_LINK_GCC_C_SEQUENCE_SPEC ";" \
+  ":%G %L %G}"