eabispe.h

gcc-you can use this code to learn something about gcc, and inquire further into linux,

/* Core target definitions for GNU compiler
   for PowerPC embedded targeted systems with SPE support.
   Copyright (C) 2002 Free Software Foundation, Inc.
   Contributed by Aldy Hernandez ([e-mail]).

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.  */

#undef TARGET_DEFAULT
#define TARGET_DEFAULT (MASK_POWERPC | MASK_NEW_MNEMONICS | MASK_EABI)

#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (PowerPC Embedded SPE)");

#undef SUBSUBTARGET_OVERRIDE_OPTIONS
#define SUBSUBTARGET_OVERRIDE_OPTIONS \
  rs6000_cpu = PROCESSOR_PPC8540; \
  rs6000_spe_abi = 1; \
  rs6000_fprs = 0; \
  /* See note below.  */ \
  /*rs6000_long_double_type_size = 128;*/ \
  rs6000_isel = 1

/*
  The e500 ABI says that either long doubles are 128 bits, or if
  implemented in any other size, the compiler/linker should error out.
  We have no emulation libraries for 128 bit long doubles, and I hate
  the dozens of failures on the regression suite.  So I'm breaking ABI
  specifications, until I properly fix the emulation.

  Enable these later.
#undef CPP_LONGDOUBLE_DEFAULT_SPEC
#define CPP_LONGDOUBLE_DEFAULT_SPEC "-D__LONG_DOUBLE_128__=1"
*/

#undef ASM_DEFAULT_SPEC
#define	ASM_DEFAULT_SPEC "-mppc -mspe -me500"