diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 699591b10b0..70f779ea9a2 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2004-01-09  Kazuhiro Inaoka  <inaoka.kazuhiro@renesas.com>
+
+	* config/m32r/m32r.h (TARGET_CPU_CPP_BUILTINS): Add __m32r__.
+
 2004-01-09  Kazu Hirata  <kazu@cs.umass.edu>
 
 	PR target/13380.
diff --git a/gcc/config/m32r/m32r.h b/gcc/config/m32r/m32r.h
index b515e778bb6..ae29628e9ac 100644
--- a/gcc/config/m32r/m32r.h
+++ b/gcc/config/m32r/m32r.h
@@ -1,5 +1,5 @@
 /* Definitions of target machine for GNU compiler, Renesas M32R cpu.
-   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
+   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
    Free Software Foundation, Inc.
 
    This file is part of GCC.
@@ -115,6 +115,7 @@
   do						\
     {						\
       builtin_define ("__M32R__");		\
+      builtin_define ("__m32r__");		\
       builtin_assert ("cpu=m32r");		\
       builtin_assert ("machine=m32r");		\
       builtin_define (TARGET_BIG_ENDIAN		\