gcc/config/freebsd.h

   1 /* Base configuration file for all FreeBSD targets.
   2    Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* Common FreeBSD configuration.
  22    All FreeBSD architectures should include this file, which will specify
  23    their commonalities.
  24    Adapted from gcc/config/i386/freebsd-elf.h by
  25    David O'Brien <obrien@FreeBSD.org>.
  26    Further work by David O'Brien <obrien@FreeBSD.org> and
  27    Loren J. Rittle <ljrittle@acm.org>.  */
  28
  29
  30 /* To help with rs6000/sysv4.h carnal knowledge problem.  */
  31 #define _USING_CONFIG_FREEBSD 1
  32
  33 /* This defines which switch letters take arguments.  On FreeBSD, most of
  34    the normal cases (defined in gcc.c) apply, and we also have -h* and
  35    -z* options (for the linker) (coming from SVR4).
  36    We also have -R (alias --rpath), no -z, --soname (-h), --assert etc.  */
  37
  38 #define FBSD_SWITCH_TAKES_ARG(CHAR)                                     \
  39   (DEFAULT_SWITCH_TAKES_ARG (CHAR)                                      \
  40     || (CHAR) == 'h'                                                    \
  41     || (CHAR) == 'z' /* ignored by ld */                                \
  42     || (CHAR) == 'R')
  43
  44 #undef  SWITCH_TAKES_ARG
  45 #define SWITCH_TAKES_ARG(CHAR) (FBSD_SWITCH_TAKES_ARG(CHAR))
  46
  47 /* This defines which multi-letter switches take arguments.  */
  48
  49 #define FBSD_WORD_SWITCH_TAKES_ARG(STR)                                 \
  50   (DEFAULT_WORD_SWITCH_TAKES_ARG (STR)                                  \
  51    || !strcmp ((STR), "rpath") || !strcmp ((STR), "rpath-link")         \
  52    || !strcmp ((STR), "soname") || !strcmp ((STR), "defsym")            \
  53    || !strcmp ((STR), "assert") || !strcmp ((STR), "dynamic-linker"))
  54
  55 #undef  WORD_SWITCH_TAKES_ARG
  56 #define WORD_SWITCH_TAKES_ARG(STR) (FBSD_WORD_SWITCH_TAKES_ARG(STR))
  57
  58 #if FBSD_MAJOR == 6
  59 #define FBSD_CPP_PREDEFINES \
  60   "-D__FreeBSD__=6 -Dunix -D__ELF__ -D__KPRINTF_ATTRIBUTE__ -Asystem=unix -Asystem=bsd -Asystem=FreeBSD"
  61 #endif
  62
  63 #if FBSD_MAJOR == 5
  64 #define FBSD_CPP_PREDEFINES \
  65   "-D__FreeBSD__=5 -Dunix -D__ELF__ -D__KPRINTF_ATTRIBUTE__ -Asystem=unix -Asystem=bsd -Asystem=FreeBSD"
  66 #endif
  67
  68 #if FBSD_MAJOR == 4
  69 #define FBSD_CPP_PREDEFINES \
  70   "-D__FreeBSD__=4 -Dunix -D__ELF__ -D__KPRINTF_ATTRIBUTE__ -Asystem=unix -Asystem=bsd -Asystem=FreeBSD"
  71 #endif
  72
  73 #if FBSD_MAJOR == 3
  74 #define FBSD_CPP_PREDEFINES \
  75   "-D__FreeBSD__=3 -Dunix -D__ELF__ -D__KPRINTF_ATTRIBUTE__ -Asystem=unix -Asystem=bsd -Asystem=FreeBSD"
  76 #endif
  77
  78 #ifndef FBSD_CPP_PREDEFINES
  79 #define FBSD_CPP_PREDEFINES \
  80   "-D__FreeBSD__   -Dunix -D__ELF__ -D__KPRINTF_ATTRIBUTE__ -Asystem=unix -Asystem=bsd -Asystem=FreeBSD"
  81 #endif
  82
  83 #undef  CPP_PREDEFINES
  84 #define CPP_PREDEFINES FBSD_CPP_PREDEFINES
  85
  86 /* Provide a CPP_SPEC appropriate for FreeBSD.  We just deal with the GCC
  87    option `-posix', and PIC issues.  */
  88
  89 #define FBSD_CPP_SPEC "                                                 \
  90   %(cpp_cpu)                                                            \
  91   %{fPIC:-D__PIC__ -D__pic__} %{fpic:-D__PIC__ -D__pic__}               \
  92   %{posix:-D_POSIX_SOURCE}"
  93
  94 #undef  CPP_SPEC
  95 #define CPP_SPEC FBSD_CPP_SPEC
  96
  97 /* Provide a STARTFILE_SPEC appropriate for FreeBSD.  Here we add
  98    the magical crtbegin.o file (see crtstuff.c) which provides part
  99         of the support for getting C++ file-scope static object constructed
 100         before entering `main'. */
 101
 102 #define FBSD_STARTFILE_SPEC \
 103   "%{!shared: \
 104      %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
 105                        %{!p:%{profile:gcrt1.o%s} \
 106                          %{!profile:crt1.o%s}}}} \
 107    crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"
 108
 109 /* Provide a ENDFILE_SPEC appropriate for FreeBSD.  Here we tack on
 110    the magical crtend.o file (see crtstuff.c) which provides part of
 111         the support for getting C++ file-scope static object constructed
 112         before entering `main', followed by a normal "finalizer" file,
 113         `crtn.o'.  */
 114
 115 #define FBSD_ENDFILE_SPEC \
 116   "%{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"
 117
 118 /* Provide a LIB_SPEC appropriate for FreeBSD as configured and as
 119    required by the user-land thread model.  Before __FreeBSD_version
 120    500016, select the appropriate libc, depending on whether we're
 121    doing profiling or need threads support.  At __FreeBSD_version
 122    500016 and later, when threads support is requested include both
 123    -lc and -lc_r instead of only -lc_r.  To make matters interesting,
 124    we can't actually use __FreeBSD_version provided by <osreldate.h>
 125    directly since it breaks cross-compiling.  As a final twist, make
 126    it a hard error if -pthread is provided on the command line and gcc
 127    was configured with --disable-threads (this will help avoid bug
 128    reports from users complaining about threading when they
 129    misconfigured the gcc bootstrap but are later consulting FreeBSD
 130    manual pages that refer to the mythical -pthread option).  */
 131
 132 /* Provide a LIB_SPEC appropriate for FreeBSD.  Just select the appropriate
 133    libc, depending on whether we're doing profiling or need threads support.
 134    (simular to the default, except no -lg, and no -p).  */
 135
 136 #ifdef FBSD_NO_THREADS
 137 #define FBSD_LIB_SPEC "                                                 \
 138   %{pthread: %eThe -pthread option is only supported on FreeBSD when gcc \
 139 is built with the --enable-threads configure-time option.}              \
 140   %{!shared:                                                            \
 141     %{!pg: -lc}                                                         \
 142     %{pg:  -lc_p}                                                       \
 143   }"
 144 #else
 145 #if FBSD_MAJOR >= 5
 146 #define FBSD_LIB_SPEC "                                                 \
 147   %{!shared:                                                            \
 148     %{!pg: %{pthread:-lc_r} -lc}                                        \
 149     %{pg:  %{pthread:-lc_r_p} -lc_p}                                    \
 150   }"
 151 #else
 152 #define FBSD_LIB_SPEC "                                                 \
 153   %{!shared:                                                            \
 154     %{!pg:                                                              \
 155       %{!pthread:-lc}                                                   \
 156       %{pthread:-lc_r}}                                                 \
 157     %{pg:                                                               \
 158       %{!pthread:-lc_p}                                                 \
 159       %{pthread:-lc_r_p}}                                               \
 160   }"
 161 #endif
 162 #endif
 163
 164 #undef  LIB_SPEC
 165 #define LIB_SPEC FBSD_LIB_SPEC
 166
 167
 168 /************************[  Target stuff  ]***********************************/
 169
 170 /* Don't assume anything about the header files.  */
 171 #undef  NO_IMPLICIT_EXTERN_C
 172 #define NO_IMPLICIT_EXTERN_C
 173
 174 /* Allow #sccs in preprocessor.  */
 175 #undef  SCCS_DIRECTIVE
 176 #define SCCS_DIRECTIVE
 177
 178 /* Make gcc agree with FreeBSD's standard headers (<machine/ansi.h>, etc...)  */
 179
 180 #undef  WCHAR_TYPE
 181 #define WCHAR_TYPE "int"
 182
 183 #undef  WCHAR_UNSIGNED
 184 #define WCHAR_UNSIGNED 0
 185
 186 /* Code generation parameters.  */
 187
 188 /* Don't default to pcc-struct-return, because gcc is the only compiler, and
 189    we want to retain compatibility with older gcc versions
 190    (even though the SVR4 ABI for the i386 says that records and unions are
 191    returned in memory).  */
 192 #undef  DEFAULT_PCC_STRUCT_RETURN
 193 #define DEFAULT_PCC_STRUCT_RETURN 0
 194
 195 /* Use periods rather than dollar signs in special g++ assembler names.
 196    This ensures the configuration knows our system correctly so we can link
 197    with libraries compiled with the native cc.  */
 198 #undef NO_DOLLAR_IN_LABEL
 199
 200 /* The prefix to add to user-visible assembler symbols.
 201    For System V Release 4 & ELF the convention is *not* to prepend a leading
 202    underscore onto user-level symbol names. Some CPU files such as
 203    config/sparc/sparc.h set this wrong for ELF.  */
 204
 205 #undef  USER_LABEL_PREFIX
 206 #define USER_LABEL_PREFIX ""
 207
 208 /* Handle #pragma weak and #pragma pack.  */
 209 #undef  HANDLE_SYSV_PRAGMA
 210 #define HANDLE_SYSV_PRAGMA
 211
 212 /************************[  Assembler stuff  ]********************************/
 213
 214 #undef  IDENT_ASM_OP
 215 #define IDENT_ASM_OP "\t.ident\t"
 216
 217 /* Output #ident as a .ident.  */
 218
 219 #undef  ASM_OUTPUT_IDENT
 220 #define ASM_OUTPUT_IDENT(FILE, NAME)                                    \
 221   fprintf ((FILE), "%s\"%s\"\n", IDENT_ASM_OP, (NAME));
 222
 223 /************************[  Debugger stuff  ]*********************************/
 224
 225 /* All ELF targets can support DWARF-2.  */
 226 #undef  DWARF2_DEBUGGING_INFO
 227 #define DWARF2_DEBUGGING_INFO
 228
 229 /* This is BSD, so we want the DBX format.  */
 230 #undef  DBX_DEBUGGING_INFO
 231 #define DBX_DEBUGGING_INFO
 232
 233 /* Even though this is BSD, ELF and the GNU tools operates better with dwarf2
 234    than stabs.  Since we don't have any native tools to be compatible with,
 235    defaulting to dwarf2 is OK.  */
 236 #undef  PREFERRED_DEBUGGING_TYPE
 237 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG