gcc/config/rs6000/linux.h

   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, 2004, 2005
   4    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 1
  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_HAS_F_SETLKW
 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