gcc/config/linux.h

   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
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GCC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public 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
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, 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