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diff --git a/gcc/config/mips/rtems64.h b/gcc/config/mips/rtems64.h
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+/* Definitions for rtems targeting a MIPS ORION using ecoff.
+   Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
+   Contributed by Joel Sherrill (joel@OARcorp.com).
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Specify predefined symbols in preprocessor.  */
+
+#undef CPP_PREDEFINES
+#define CPP_PREDEFINES "-Dmips -DMIPSEB -DR4000 -D_mips -D_MIPSEB -D_R4000 \
+   -Drtems -D__rtems__ -Asystem(rtems)"
+
+/* Generate calls to memcpy, memcmp and memset.  */
+#ifndef TARGET_MEM_FUNCTIONS
+#define TARGET_MEM_FUNCTIONS
+#endif
+
+/* Undefine the following which were defined in elf64.h.  This will cause the rtems64
+   port to continue to use collect2 for constructors/destructors.  These may be removed
+   when .ctor/.dtor section support is desired. */
+
+#undef CTORS_SECTION_ASM_OP
+#undef DTORS_SECTION_ASM_OP
+
+#undef EXTRA_SECTIONS
+#define EXTRA_SECTIONS in_sdata, in_rdata
+
+#undef INVOKE__main
+#undef NAME__MAIN
+#undef SYMBOL__MAIN
+
+#undef EXTRA_SECTION_FUNCTIONS
+#define EXTRA_SECTION_FUNCTIONS                                         \
+  SECTION_FUNCTION_TEMPLATE(sdata_section, in_sdata, SDATA_SECTION_ASM_OP) \
+  SECTION_FUNCTION_TEMPLATE(rdata_section, in_rdata, RDATA_SECTION_ASM_OP)
+
+#undef ASM_OUTPUT_CONSTRUCTOR
+#undef ASM_OUTPUT_DESTRUCTOR
+
+#undef CTOR_LIST_BEGIN
+#undef CTOR_LIST_END
+#undef DTOR_LIST_BEGIN
+#undef DTOR_LIST_END
+
+#undef STARTFILE_SPEC
+#undef ENDFILE_SPEC
+
+/*  End of undefines to turn off .ctor/.dtor section support */