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 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 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, 51 Franklin Street, Fifth Floor,
  22 Boston, MA 02110-1301, USA.
  23
  24    To use this file, make up a line like that in config.gcc:
  25
  26         tm_file="$tm_file elfos.h svr4.h MACHINE/svr4.h"
  27
  28    where MACHINE is replaced by the name of the basic hardware that you
  29    are targeting for.  Then, in the file MACHINE/svr4.h, put any really
  30    system-specific defines (or overrides of defines) which you find that
  31    you need.
  32 */
  33
  34 /* Define a symbol indicating that we are using svr4.h.  */
  35 #define USING_SVR4_H
  36
  37 /* Cpp, assembler, linker, library, and startfile spec's.  */
  38
  39 /* This defines which switch letters take arguments.  On svr4, most of
  40    the normal cases (defined in gcc.c) apply, and we also have -h* and
  41    -z* options (for the linker).  Note however that there is no such
  42    thing as a -T option for svr4.  */
  43
  44 #undef  SWITCH_TAKES_ARG
  45 #define SWITCH_TAKES_ARG(CHAR)          \
  46   (DEFAULT_SWITCH_TAKES_ARG (CHAR)      \
  47    || (CHAR) == 'h'                     \
  48    || (CHAR) == 'x'                     \
  49    || (CHAR) == 'z')
  50
  51 /* This defines which multi-letter switches take arguments.  On svr4,
  52    there are no such switches except those implemented by GCC itself.  */
  53
  54 #define WORD_SWITCH_TAKES_ARG(STR)                      \
  55  (DEFAULT_WORD_SWITCH_TAKES_ARG (STR)                   \
  56   && strcmp (STR, "Tdata") && strcmp (STR, "Ttext")     \
  57   && strcmp (STR, "Tbss"))
  58
  59 /* Provide an ASM_SPEC appropriate for svr4.  Here 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 #undef  ASM_SPEC
  79 #define ASM_SPEC \
  80   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  81
  82 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
  83
  84 /* Under svr4, the normal location of the `ld' and `as' programs is the
  85    /usr/ccs/bin directory.  */
  86
  87 #ifndef CROSS_COMPILE
  88 #undef  MD_EXEC_PREFIX
  89 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
  90 #endif
  91
  92 /* Under svr4, the normal location of the various *crt*.o files is the
  93    /usr/ccs/lib directory.  */
  94
  95 #ifndef CROSS_COMPILE
  96 #undef  MD_STARTFILE_PREFIX
  97 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
  98 #endif
  99
 100 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
 101    standard C library (unless we are building a shared library).  */
 102
 103 #undef  LIB_SPEC
 104 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
 105
 106 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
 107    magical crtend.o file (see crtstuff.c) which provides part of the
 108    support for getting C++ file-scope static object constructed before
 109    entering `main', followed by the normal svr3/svr4 "finalizer" file,
 110    which is either `gcrtn.o' or `crtn.o'.  */
 111
 112 #undef  ENDFILE_SPEC
 113 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
 114
 115 /* Provide a LINK_SPEC appropriate for svr4.  Here we provide support
 116    for the special GCC options -static, -shared, and -symbolic which
 117    allow us to link things in one of these three modes by applying the
 118    appropriate combinations of options at link-time.  We also provide
 119    support here for as many of the other svr4 linker options as seems
 120    reasonable, given that some of them conflict with options for other
 121    svr4 tools (e.g. the assembler).  In particular, we do support the
 122    -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*, -l*,
 123    -o*, -r, -s, -u*, and -L* options are directly supported by gcc.c
 124    itself.  We don't directly support the -m (generate load map)
 125    option because that conflicts with the -m (run m4) option of the
 126    svr4 assembler.  We also don't directly support the svr4 linker's
 127    -I* or -M* options because these conflict with existing GCC
 128    options.  We do however allow passing arbitrary options to the svr4
 129    linker via the -Wl, option, in gcc.c.  We don't support the svr4
 130    linker's -a option at all because it is totally useless and because
 131    it conflicts with GCC's own -a option.
 132
 133    Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
 134
 135    When the -G link option is used (-shared and -symbolic) a final link is
 136    not being done.  */
 137
 138 #undef  LINK_SPEC
 139 #ifdef CROSS_COMPILE
 140 #define LINK_SPEC "%{h*} %{v:-V} \
 141                    %{b} \
 142                    %{static:-dn -Bstatic} \
 143                    %{shared:-G -dy -z text} \
 144                    %{symbolic:-Bsymbolic -G -dy -z text} \
 145                    %{G:-G} \
 146                    %{YP,*} \
 147                    %{Qy:} %{!Qn:-Qy}"
 148 #else
 149 #define LINK_SPEC "%{h*} %{v:-V} \
 150                    %{b} \
 151                    %{static:-dn -Bstatic} \
 152                    %{shared:-G -dy -z text} \
 153                    %{symbolic:-Bsymbolic -G -dy -z text} \
 154                    %{G:-G} \
 155                    %{YP,*} \
 156                    %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
 157                     %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
 158                    %{Qy:} %{!Qn:-Qy}"
 159 #endif
 160
 161 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o
 162    or /usr/ccs/lib/values-Xa.o for each final link step (depending
 163    upon the other gcc options selected, such as -ansi).  These files
 164    each contain one (initialized) copy of a special variable called
 165    `_lib_version'.  Each one of these files has `_lib_version' initialized
 166    to a different (enum) value.  The SVR4 library routines query the
 167    value of `_lib_version' at run to decide how they should behave.
 168    Specifically, they decide (based upon the value of `_lib_version')
 169    if they will act in a strictly ANSI conforming manner or not.  */
 170
 171 #undef  STARTFILE_SPEC
 172 #define STARTFILE_SPEC "%{!shared: \
 173                          %{!symbolic: \
 174                           %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
 175                         %{pg:gcrti.o%s}%{!pg:crti.o%s} \
 176                         %{ansi:values-Xc.o%s} \
 177                         %{!ansi:values-Xa.o%s} \
 178                         crtbegin.o%s"
 179
 180 /* The numbers used to denote specific machine registers in the System V
 181    Release 4 DWARF debugging information are quite likely to be totally
 182    different from the numbers used in BSD stabs debugging information
 183    for the same kind of target machine.  Thus, we undefine the macro
 184    DBX_REGISTER_NUMBER here as an extra inducement to get people to
 185    provide proper machine-specific definitions of DBX_REGISTER_NUMBER
 186    (which is also used to provide DWARF registers numbers in dwarfout.c)
 187    in their tm.h files which include this file.  */
 188
 189 #undef DBX_REGISTER_NUMBER
 190
 191 /* Define the actual types of some ANSI-mandated types.  (These
 192    definitions should work for most SVR4 systems).  */
 193
 194 #undef  SIZE_TYPE
 195 #define SIZE_TYPE "unsigned int"
 196
 197 #undef  PTRDIFF_TYPE
 198 #define PTRDIFF_TYPE "int"
 199
 200 #undef  WCHAR_TYPE
 201 #define WCHAR_TYPE "long int"
 202
 203 #undef  WCHAR_TYPE_SIZE
 204 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 205
 206 #define TARGET_POSIX_IO