1/* Definitions of target machine for GNU compiler,
2   for PowerPC machines running Linux.
3   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
4   2004, 2005, 2006 Free Software Foundation, Inc.
5   Contributed by Michael Meissner (meissner@cygnus.com).
6
7   This file is part of GCC.
8
9   GCC is free software; you can redistribute it and/or modify it
10   under the terms of the GNU General Public License as published
11   by the Free Software Foundation; either version 2, or (at your
12   option) any later version.
13
14   GCC is distributed in the hope that it will be useful, but WITHOUT
15   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
17   License for more details.
18
19   You should have received a copy of the GNU General Public License
20   along with GCC; see the file COPYING.  If not, write to the
21   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
22   MA 02110-1301, USA.  */
23
24#undef MD_EXEC_PREFIX
25#undef MD_STARTFILE_PREFIX
26
27/* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
28   process.  */
29#define OS_MISSING_POWERPC64 1
30
31/* We use glibc _mcount for profiling.  */
32#define NO_PROFILE_COUNTERS 1
33
34/* glibc has float and long double forms of math functions.  */
35#undef  TARGET_C99_FUNCTIONS
36#define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
37
38#undef  TARGET_OS_CPP_BUILTINS
39#define TARGET_OS_CPP_BUILTINS()		\
40  do						\
41    {						\
42      builtin_define_std ("PPC");		\
43      builtin_define_std ("powerpc");		\
44      builtin_assert ("cpu=powerpc");		\
45      builtin_assert ("machine=powerpc");	\
46      TARGET_OS_SYSV_CPP_BUILTINS ();		\
47    }						\
48  while (0)
49
50#undef	CPP_OS_DEFAULT_SPEC
51#define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
52
53/* The GNU C++ standard library currently requires _GNU_SOURCE being
54   defined on glibc-based systems. This temporary hack accomplishes this,
55   it should go away as soon as libstdc++-v3 has a real fix.  */
56#undef  CPLUSPLUS_CPP_SPEC
57#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
58
59#undef  LINK_SHLIB_SPEC
60#define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
61
62#undef	LIB_DEFAULT_SPEC
63#define LIB_DEFAULT_SPEC "%(lib_linux)"
64
65#undef	STARTFILE_DEFAULT_SPEC
66#define STARTFILE_DEFAULT_SPEC "%(startfile_linux)"
67
68#undef	ENDFILE_DEFAULT_SPEC
69#define ENDFILE_DEFAULT_SPEC "%(endfile_linux)"
70
71#undef	LINK_START_DEFAULT_SPEC
72#define LINK_START_DEFAULT_SPEC "%(link_start_linux)"
73
74#undef	LINK_OS_DEFAULT_SPEC
75#define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
76
77#define LINK_GCC_C_SEQUENCE_SPEC \
78  "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
79
80/* Use --as-needed -lgcc_s for eh support.  */
81#ifdef HAVE_LD_AS_NEEDED
82#define USE_LD_AS_NEEDED 1
83#endif
84
85#undef  TARGET_VERSION
86#define TARGET_VERSION fprintf (stderr, " (PowerPC GNU/Linux)");
87
88/* Override rs6000.h definition.  */
89#undef  ASM_APP_ON
90#define ASM_APP_ON "#APP\n"
91
92/* Override rs6000.h definition.  */
93#undef  ASM_APP_OFF
94#define ASM_APP_OFF "#NO_APP\n"
95
96/* For backward compatibility, we must continue to use the AIX
97   structure return convention.  */
98#undef  DRAFT_V4_STRUCT_RET
99#define DRAFT_V4_STRUCT_RET 1
100
101/* We are 32-bit all the time, so optimize a little.  */
102#undef TARGET_64BIT
103#define TARGET_64BIT 0
104
105/* We don't need to generate entries in .fixup, except when
106   -mrelocatable or -mrelocatable-lib is given.  */
107#undef RELOCATABLE_NEEDS_FIXUP
108#define RELOCATABLE_NEEDS_FIXUP \
109  (target_flags & target_flags_explicit & MASK_RELOCATABLE)
110
111#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
112
113#define TARGET_POSIX_IO
114
115#define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
116
117#ifdef TARGET_LIBC_PROVIDES_SSP
118/* ppc32 glibc provides __stack_chk_guard in -0x7008(2).  */
119#define TARGET_THREAD_SSP_OFFSET	-0x7008
120#endif
121
122#define POWERPC_LINUX
123
124/* ppc linux has 128-bit long double support in glibc 2.4 and later.  */
125#ifdef TARGET_DEFAULT_LONG_DOUBLE_128
126#define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
127#endif
128