netbsd.h

linux下的gcc编译器

/* Definitions of target machine for GNU compiler,
   for Alpha NetBSD systems.
   Copyright (C) 1998, 2002 Free Software Foundation, Inc.

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_FP | MASK_FPREGS | MASK_GAS)

#define TARGET_OS_CPP_BUILTINS()		\
    do {					\
	NETBSD_OS_CPP_BUILTINS_ELF();		\
	NETBSD_OS_CPP_BUILTINS_LP64();		\
    } while (0)


/* NetBSD doesn't use the LANGUAGE* built-ins.  */
#undef SUBTARGET_LANGUAGE_CPP_BUILTINS
#define SUBTARGET_LANGUAGE_CPP_BUILTINS()	/* nothing */


/* Show that we need a GP when profiling.  */
#undef TARGET_PROFILING_NEEDS_GP
#define TARGET_PROFILING_NEEDS_GP 1


/* Provide a CPP_SUBTARGET_SPEC appropriate for NetBSD/alpha.  We use
   this to pull in CPP specs that all NetBSD configurations need.  */

#undef CPP_SUBTARGET_SPEC
#define CPP_SUBTARGET_SPEC NETBSD_CPP_SPEC

#undef SUBTARGET_EXTRA_SPECS
#define SUBTARGET_EXTRA_SPECS			\
  { "netbsd_link_spec", NETBSD_LINK_SPEC_ELF },	\
  { "netbsd_entry_point", NETBSD_ENTRY_POINT },	\
  { "netbsd_endfile_spec", NETBSD_ENDFILE_SPEC },


/* Provide a LINK_SPEC appropriate for a NetBSD/alpha ELF target.  */

#undef LINK_SPEC
#define LINK_SPEC \
  "%{G*} %{relax:-relax} \
   %{O*:-O3} %{!O*:-O1} \
   %(netbsd_link_spec)"

#define NETBSD_ENTRY_POINT "__start"


/* Provide an ENDFILE_SPEC appropriate for NetBSD/alpha ELF.  Here we
   add crtend.o, which provides part of the support for getting
   C++ file-scope static objects deconstructed after exiting "main".

   We also need to handle the GCC option `-ffast-math'.  */

#undef ENDFILE_SPEC
#define ENDFILE_SPEC		\
  "%{ffast-math|funsafe-math-optimizations:crtfm%O%s} \
   %(netbsd_endfile_spec)"


/* Attempt to enable execute permissions on the stack.  */

#define TRANSFER_FROM_TRAMPOLINE NETBSD_ENABLE_EXECUTE_STACK


#undef TARGET_VERSION
#define TARGET_VERSION fprintf (stderr, " (NetBSD/alpha ELF)");