1/* Definitions for Linux-based GNU systems with ELF format
2   Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2003, 2004, 2005, 2006
3   Free Software Foundation, Inc.
4   Contributed by Eric Youngdale.
5   Modified for stabs-in-ELF by H.J. Lu (hjl@lucon.org).
6
7This file is part of GCC.
8
9GCC is free software; you can redistribute it and/or modify
10it under the terms of the GNU General Public License as published by
11the Free Software Foundation; either version 2, or (at your option)
12any later version.
13
14GCC is distributed in the hope that it will be useful,
15but WITHOUT ANY WARRANTY; without even the implied warranty of
16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17GNU General Public License for more details.
18
19You should have received a copy of the GNU General Public License
20along with GCC; see the file COPYING.  If not, write to
21the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22Boston, MA 02110-1301, USA.  */
23
24/* Don't assume anything about the header files.  */
25#define NO_IMPLICIT_EXTERN_C
26
27#undef ASM_APP_ON
28#define ASM_APP_ON "#APP\n"
29
30#undef ASM_APP_OFF
31#define ASM_APP_OFF "#NO_APP\n"
32
33#undef MD_EXEC_PREFIX
34#undef MD_STARTFILE_PREFIX
35
36/* Provide a STARTFILE_SPEC appropriate for GNU/Linux.  Here we add
37   the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
38   provides part of the support for getting C++ file-scope static
39   object constructed before entering `main'.  */
40
41#undef	STARTFILE_SPEC
42#if defined HAVE_LD_PIE
43#define STARTFILE_SPEC \
44  "%{!shared: %{pg|p|profile:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}} \
45   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
46#else
47#define STARTFILE_SPEC \
48  "%{!shared: %{pg|p|profile:gcrt1.o%s;:crt1.o%s}} \
49   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
50#endif
51
52/* Provide a ENDFILE_SPEC appropriate for GNU/Linux.  Here we tack on
53   the GNU/Linux magical crtend.o file (see crtstuff.c) which
54   provides part of the support for getting C++ file-scope static
55   object constructed before entering `main', followed by a normal
56   GNU/Linux "finalizer" file, `crtn.o'.  */
57
58#undef	ENDFILE_SPEC
59#define ENDFILE_SPEC \
60  "%{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
61
62/* This is for -profile to use -lc_p instead of -lc.  */
63#ifndef CC1_SPEC
64#define CC1_SPEC "%{profile:-p}"
65#endif
66
67/* The GNU C++ standard library requires that these macros be defined.  */
68#undef CPLUSPLUS_CPP_SPEC
69#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
70
71#undef	LIB_SPEC
72#define LIB_SPEC \
73  "%{pthread:-lpthread} \
74   %{shared:-lc} \
75   %{!shared:%{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc}}"
76
77#define LINUX_TARGET_OS_CPP_BUILTINS()				\
78    do {							\
79	builtin_define ("__gnu_linux__");			\
80	builtin_define_std ("linux");				\
81	builtin_define_std ("unix");				\
82	builtin_assert ("system=linux");			\
83	builtin_assert ("system=unix");				\
84	builtin_assert ("system=posix");			\
85    } while (0)
86
87#if defined(HAVE_LD_EH_FRAME_HDR)
88#define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
89#endif
90
91/* Define this so we can compile MS code for use with WINE.  */
92#define HANDLE_PRAGMA_PACK_PUSH_POP
93
94#define LINK_GCC_C_SEQUENCE_SPEC \
95  "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
96
97/* Use --as-needed -lgcc_s for eh support.  */
98#ifdef HAVE_LD_AS_NEEDED
99#define USE_LD_AS_NEEDED 1
100#endif
101
102/* Determine which dynamic linker to use depending on whether GLIBC or
103   uClibc is the default C library and whether -muclibc or -mglibc has
104   been passed to change the default.  */
105#if UCLIBC_DEFAULT
106#define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:%{muclibc:%e-mglibc and -muclibc used together}" G ";:" U "}"
107#else
108#define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:%{mglibc:%e-mglibc and -muclibc used together}" U ";:" G "}"
109#endif
110
111/* For most targets the following definitions suffice;
112   GLIBC_DYNAMIC_LINKER must be defined for each target using them, or
113   GLIBC_DYNAMIC_LINKER32 and GLIBC_DYNAMIC_LINKER64 for targets
114   supporting both 32-bit and 64-bit compilation.  */
115#define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
116#define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
117#define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
118#define LINUX_DYNAMIC_LINKER \
119  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER)
120#define LINUX_DYNAMIC_LINKER32 \
121  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
122#define LINUX_DYNAMIC_LINKER64 \
123  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
124
125/* Determine whether the entire c99 runtime
126   is present in the runtime library.  */
127#define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
128
129#define TARGET_POSIX_IO
130