gcc/config/svr4.h

   1 /* Operating system specific defines to be used when targeting GCC for some
   2    generic System V Release 4 system.
   3    Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001, 2007 Free Software Foundation, Inc.
   5    Contributed by Ron Guilmette (rfg@monkeys.com).
   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 3, 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 COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.
  22
  23    To use this file, make up a line like that in config.gcc:
  24
  25         tm_file="$tm_file elfos.h svr4.h MACHINE/svr4.h"
  26
  27    where MACHINE is replaced by the name of the basic hardware that you
  28    are targeting for.  Then, in the file MACHINE/svr4.h, put any really
  29    system-specific defines (or overrides of defines) which you find that
  30    you need.
  31 */
  32
  33 /* Define a symbol indicating that we are using svr4.h.  */
  34 #define USING_SVR4_H
  35
  36 /* Cpp, assembler, linker, library, and startfile spec's.  */
  37
  38 /* This defines which switch letters take arguments.  On svr4, most of
  39    the normal cases (defined in gcc.c) apply, and we also have -h* and
  40    -z* options (for the linker).  Note however that there is no such
  41    thing as a -T option for svr4.  */
  42
  43 #undef  SWITCH_TAKES_ARG
  44 #define SWITCH_TAKES_ARG(CHAR)          \
  45   (DEFAULT_SWITCH_TAKES_ARG (CHAR)      \
  46    || (CHAR) == 'h'                     \
  47    || (CHAR) == 'x'                     \
  48    || (CHAR) == 'z')
  49
  50 /* This defines which multi-letter switches take arguments.  On svr4,
  51    there are no such switches except those implemented by GCC itself.  */
  52
  53 #define WORD_SWITCH_TAKES_ARG(STR)                      \
  54  (DEFAULT_WORD_SWITCH_TAKES_ARG (STR)                   \
  55   && strcmp (STR, "Tdata") && strcmp (STR, "Ttext")     \
  56   && strcmp (STR, "Tbss"))
  57
  58 /* Provide an ASM_SPEC appropriate for svr4.
  59    If we're not using GAS, we try to support as
  60    many of the specialized svr4 assembler options as seems reasonable,
  61    given that there are certain options which we can't (or shouldn't)
  62    support directly due to the fact that they conflict with other options
  63    for other svr4 tools (e.g. ld) or with other options for GCC itself.
  64    For example, we don't support the -o (output file) or -R (remove
  65    input file) options because GCC already handles these things.  We
  66    also don't support the -m (run m4) option for the assembler because
  67    that conflicts with the -m (produce load map) option of the svr4
  68    linker.  We do however allow passing arbitrary options to the svr4
  69    assembler via the -Wa, option.
  70
  71    Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
  72    option.
  73
  74    The svr4 assembler wants '-' on the command line if it's expected to
  75    read its stdin.
  76 */
  77
  78 #ifdef USE_GAS
  79 #define SVR4_ASM_SPEC \
  80   "%{v:-V} %{Wa,*:%*}"
  81 #else
  82 #define SVR4_ASM_SPEC \
  83   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  84 #endif
  85
  86 #undef  ASM_SPEC
  87 #define ASM_SPEC SVR4_ASM_SPEC
  88
  89 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
  90
  91 /* Under svr4, the normal location of the `ld' and `as' programs is the
  92    /usr/ccs/bin directory.  */
  93
  94 #ifndef CROSS_DIRECTORY_STRUCTURE
  95 #undef  MD_EXEC_PREFIX
  96 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
  97 #endif
  98
  99 /* Under svr4, the normal location of the various *crt*.o files is the
 100    /usr/ccs/lib directory.  */
 101
 102 #ifndef CROSS_DIRECTORY_STRUCTURE
 103 #undef  MD_STARTFILE_PREFIX
 104 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
 105 #endif
 106
 107 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
 108    standard C library (unless we are building a shared library).  */
 109
 110 #undef  LIB_SPEC
 111 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
 112
 113 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
 114    magical crtend.o file (see crtstuff.c) which provides part of the
 115    support for getting C++ file-scope static object constructed before
 116    entering `main', followed by the normal svr3/svr4 "finalizer" file,
 117    which is either `gcrtn.o' or `crtn.o'.  */
 118
 119 #undef  ENDFILE_SPEC
 120 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
 121
 122 /* Provide a LINK_SPEC appropriate for svr4.  Here we provide support
 123    for the special GCC options -static, -shared, and -symbolic which
 124    allow us to link things in one of these three modes by applying the
 125    appropriate combinations of options at link-time.  We also provide
 126    support here for as many of the other svr4 linker options as seems
 127    reasonable, given that some of them conflict with options for other
 128    svr4 tools (e.g. the assembler).  In particular, we do support the
 129    -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*, -l*,
 130    -o*, -r, -s, -u*, and -L* options are directly supported by gcc.c
 131    itself.  We don't directly support the -m (generate load map)
 132    option because that conflicts with the -m (run m4) option of the
 133    svr4 assembler.  We also don't directly support the svr4 linker's
 134    -I* or -M* options because these conflict with existing GCC
 135    options.  We do however allow passing arbitrary options to the svr4
 136    linker via the -Wl, option, in gcc.c.  We don't support the svr4
 137    linker's -a option at all because it is totally useless and because
 138    it conflicts with GCC's own -a option.
 139
 140    Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
 141
 142    When the -G link option is used (-shared and -symbolic) a final link is
 143    not being done.  */
 144
 145 #undef  LINK_SPEC
 146 #ifdef CROSS_DIRECTORY_STRUCTURE
 147 #define LINK_SPEC "%{h*} %{v:-V} \
 148                    %{b} \
 149                    %{static:-dn -Bstatic} \
 150                    %{shared:-G -dy -z text} \
 151                    %{symbolic:-Bsymbolic -G -dy -z text} \
 152                    %{G:-G} \
 153                    %{YP,*} \
 154                    %{Qy:} %{!Qn:-Qy}"
 155 #else
 156 #define LINK_SPEC "%{h*} %{v:-V} \
 157                    %{b} \
 158                    %{static:-dn -Bstatic} \
 159                    %{shared:-G -dy -z text} \
 160                    %{symbolic:-Bsymbolic -G -dy -z text} \
 161                    %{G:-G} \
 162                    %{YP,*} \
 163                    %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
 164                     %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
 165                    %{Qy:} %{!Qn:-Qy}"
 166 #endif
 167
 168 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o
 169    or /usr/ccs/lib/values-Xa.o for each final link step (depending
 170    upon the other gcc options selected, such as -ansi).  These files
 171    each contain one (initialized) copy of a special variable called
 172    `_lib_version'.  Each one of these files has `_lib_version' initialized
 173    to a different (enum) value.  The SVR4 library routines query the
 174    value of `_lib_version' at run to decide how they should behave.
 175    Specifically, they decide (based upon the value of `_lib_version')
 176    if they will act in a strictly ANSI conforming manner or not.  */
 177
 178 #undef  STARTFILE_SPEC
 179 #define STARTFILE_SPEC "%{!shared: \
 180                          %{!symbolic: \
 181                           %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
 182                         %{pg:gcrti.o%s}%{!pg:crti.o%s} \
 183                         %{ansi:values-Xc.o%s} \
 184                         %{!ansi:values-Xa.o%s} \
 185                         crtbegin.o%s"
 186
 187 /* The numbers used to denote specific machine registers in the System V
 188    Release 4 DWARF debugging information are quite likely to be totally
 189    different from the numbers used in BSD stabs debugging information
 190    for the same kind of target machine.  Thus, we undefine the macro
 191    DBX_REGISTER_NUMBER here as an extra inducement to get people to
 192    provide proper machine-specific definitions of DBX_REGISTER_NUMBER
 193    (which is also used to provide DWARF registers numbers in dwarfout.c)
 194    in their tm.h files which include this file.  */
 195
 196 #undef DBX_REGISTER_NUMBER
 197
 198 /* Define the actual types of some ANSI-mandated types.  (These
 199    definitions should work for most SVR4 systems).  */
 200
 201 #undef  SIZE_TYPE
 202 #define SIZE_TYPE "unsigned int"
 203
 204 #undef  PTRDIFF_TYPE
 205 #define PTRDIFF_TYPE "int"
 206
 207 #undef  WCHAR_TYPE
 208 #define WCHAR_TYPE "long int"
 209
 210 #undef  WCHAR_TYPE_SIZE
 211 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 212
 213 #define TARGET_POSIX_IO