linux.h revision 132718 
1/* Definitions for Linux-based GNU systems with ELF format
2   Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2003
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, 59 Temple Place - Suite 330,
22Boston, MA 02111-1307, 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#ifdef USE_GNULIBC_1
43#define STARTFILE_SPEC \
44  "%{!shared: \
45     %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
46		       %{!p:%{profile:gcrt1.o%s} \
47			 %{!profile:crt1.o%s}}}} \
48   crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
49#elif defined HAVE_LD_PIE
50#define STARTFILE_SPEC \
51  "%{!shared: %{pg|p|profile:gcrt1.o%s;pie:Scrt1.o%s;:crt1.o%s}} \
52   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
53#else
54#define STARTFILE_SPEC \
55  "%{!shared: %{pg|p|profile:gcrt1.o%s;:crt1.o%s}} \
56   crti.o%s %{static:crtbeginT.o%s;shared|pie:crtbeginS.o%s;:crtbegin.o%s}"
57#endif
58
59/* Provide a ENDFILE_SPEC appropriate for GNU/Linux.  Here we tack on
60   the GNU/Linux magical crtend.o file (see crtstuff.c) which
61   provides part of the support for getting C++ file-scope static
62   object constructed before entering `main', followed by a normal
63   GNU/Linux "finalizer" file, `crtn.o'.  */
64
65#undef	ENDFILE_SPEC
66#define ENDFILE_SPEC \
67  "%{shared|pie:crtendS.o%s;:crtend.o%s} crtn.o%s"
68
69/* This is for -profile to use -lc_p instead of -lc.  */
70#ifndef CC1_SPEC
71#define CC1_SPEC "%{profile:-p}"
72#endif
73
74/* The GNU C++ standard library requires that these macros be defined.  */
75#undef CPLUSPLUS_CPP_SPEC
76#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
77
78#undef	LIB_SPEC
79/* We no longer link with libc_p.a or libg.a by default. If you
80   want to profile or debug the GNU/Linux C library, please add
81   -profile or -ggdb to LDFLAGS at the link time, respectively.  */
82#if 1
83#ifdef USE_GNULIBC_1
84#define LIB_SPEC \
85  "%{!shared: %{p:-lgmon} %{pg:-lgmon} %{profile:-lgmon -lc_p} \
86     %{!profile:%{!ggdb:-lc} %{ggdb:-lg}}}"
87#else
88#define LIB_SPEC \
89  "%{pthread:-lpthread} \
90   %{shared:-lc} \
91   %{!shared:%{mieee-fp:-lieee} %{profile:-lc_p}%{!profile:-lc}}"
92#endif
93#else
94#define LIB_SPEC \
95  "%{!shared: \
96     %{p:-lgmon -lc_p} %{pg:-lgmon -lc_p} \
97       %{!p:%{!pg:%{!g*:-lc} %{g*:-lg}}}}"
98#endif
99
100#define LINUX_TARGET_OS_CPP_BUILTINS()				\
101    do {							\
102	builtin_define ("__gnu_linux__");			\
103	builtin_define_std ("linux");				\
104	builtin_define_std ("unix");				\
105	builtin_assert ("system=linux");			\
106	builtin_assert ("system=unix");				\
107	builtin_assert ("system=posix");			\
108    } while (0)
109
110#if !defined(USE_GNULIBC_1) && defined(HAVE_LD_EH_FRAME_HDR)
111#define LINK_EH_SPEC "%{!static:--eh-frame-hdr} "
112#endif
113
114/* Define this so we can compile MS code for use with WINE.  */
115#define HANDLE_PRAGMA_PACK_PUSH_POP
116
117#define LINK_GCC_C_SEQUENCE_SPEC \
118  "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
119
120/* Determine whether the the entire c99 runtime
121   is present in the runtime library.  */
122#ifndef USE_GNULIBC_1
123#define TARGET_C99_FUNCTIONS 1
124#endif
125
126#define TARGET_HAS_F_SETLKW
127