Major rework.

From-SVN: r4792

gcc/config/sh/t-sh

 LIBGCC1 = libgcc1.null
-T_CFLAGS = -DDONT_HAVE_STDIO -DDONT_HAVE_SETJMP  -Dinhibit_libc
-LIBGCC2_CFLAGS=-g -fno-omit-frame-pointer -O2 $(GCC_CFLAGS) 
-
-# These are really part of libgcc1, but this will cause them to be
-# built correctly, so... [taken from t-ose68k]
-LIB2FUNCS_EXTRA = fp-bit.c dp-bit.c
-dp-bit.c: $(srcdir)/config/fp-bit.c
-	cat $(srcdir)/config/fp-bit.c >> dp-bit.c
-
-fp-bit.c: $(srcdir)/config/fp-bit.c
-	echo '#define FLOAT' > fp-bit.c
-	cat $(srcdir)/config/fp-bit.c >> fp-bit.c
+T_CFLAGS = -DDONT_HAVE_STDIO -DDONT_HAVE_SETJMP  -Dinhibit_libc 
+LIBGCC2_CFLAGS=-g -O5 $(GCC_CFLAGS) 
 
 

gcc/config/sh/xm-sh.h

 /* Configuration for GNU C-compiler for Hitachi SH.
    Copyright (C) 1993 Free Software Foundation, Inc.
-   This file is part of GNU CC.
+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
@@ -26,6 +26,11 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #define HOST_BITS_PER_INT 32
 #define HOST_BITS_PER_LONG 32
 
+/* If compiled with GNU C, use the built-in alloca.  */
+#ifdef __GNUC__
+#define alloca __builtin_alloca
+#endif
+
 /* target machine dependencies.
    tm.h is a symbolic link to the actual target specific file.  */
 #include "tm.h"