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.  Here we try to support as
  59    many of the specialized svr4 assembler options as seems reasonable,
  60    given that there are certain options which we can't (or shouldn't)
  61    support directly due to the fact that they conflict with other options
  62    for other svr4 tools (e.g. ld) or with other options for GCC itself.
  63    For example, we don't support the -o (output file) or -R (remove
  64    input file) options because GCC already handles these things.  We
  65    also don't support the -m (run m4) option for the assembler because
  66    that conflicts with the -m (produce load map) option of the svr4
  67    linker.  We do however allow passing arbitrary options to the svr4
  68    assembler via the -Wa, option.
  69
  70    Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
  71    option.
  72
  73    The svr4 assembler wants '-' on the command line if it's expected to
  74    read its stdin.
  75 */
  76
  77 #undef  ASM_SPEC
  78 #define ASM_SPEC \
  79   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  80
  81 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
  82
  83 /* Under svr4, the normal location of the `ld' and `as' programs is the
  84    /usr/ccs/bin directory.  */
  85
  86 #ifndef CROSS_DIRECTORY_STRUCTURE
  87 #undef  MD_EXEC_PREFIX
  88 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
  89 #endif
  90
  91 /* Under svr4, the normal location of the various *crt*.o files is the
  92    /usr/ccs/lib directory.  */
  93
  94 #ifndef CROSS_DIRECTORY_STRUCTURE
  95 #undef  MD_STARTFILE_PREFIX
  96 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
  97 #endif
  98
  99 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
 100    standard C library (unless we are building a shared library).  */
 101
 102 #undef  LIB_SPEC
 103 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
 104
 105 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
 106    magical crtend.o file (see crtstuff.c) which provides part of the
 107    support for getting C++ file-scope static object constructed before
 108    entering `main', followed by the normal svr3/svr4 "finalizer" file,
 109    which is either `gcrtn.o' or `crtn.o'.  */
 110
 111 #undef  ENDFILE_SPEC
 112 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
 113
 114 /* Provide a LINK_SPEC appropriate for svr4.  Here we provide support
 115    for the special GCC options -static, -shared, and -symbolic which
 116    allow us to link things in one of these three modes by applying the
 117    appropriate combinations of options at link-time.  We also provide
 118    support here for as many of the other svr4 linker options as seems
 119    reasonable, given that some of them conflict with options for other
 120    svr4 tools (e.g. the assembler).  In particular, we do support the
 121    -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*, -l*,
 122    -o*, -r, -s, -u*, and -L* options are directly supported by gcc.c
 123    itself.  We don't directly support the -m (generate load map)
 124    option because that conflicts with the -m (run m4) option of the
 125    svr4 assembler.  We also don't directly support the svr4 linker's
 126    -I* or -M* options because these conflict with existing GCC
 127    options.  We do however allow passing arbitrary options to the svr4
 128    linker via the -Wl, option, in gcc.c.  We don't support the svr4
 129    linker's -a option at all because it is totally useless and because
 130    it conflicts with GCC's own -a option.
 131
 132    Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
 133
 134    When the -G link option is used (-shared and -symbolic) a final link is
 135    not being done.  */
 136
 137 #undef  LINK_SPEC
 138 #ifdef CROSS_DIRECTORY_STRUCTURE
 139 #define LINK_SPEC "%{h*} %{v:-V} \
 140                    %{b} \
 141                    %{static:-dn -Bstatic} \
 142                    %{shared:-G -dy -z text} \
 143                    %{symbolic:-Bsymbolic -G -dy -z text} \
 144                    %{G:-G} \
 145                    %{YP,*} \
 146                    %{Qy:} %{!Qn:-Qy}"
 147 #else
 148 #define LINK_SPEC "%{h*} %{v:-V} \
 149                    %{b} \
 150                    %{static:-dn -Bstatic} \
 151                    %{shared:-G -dy -z text} \
 152                    %{symbolic:-Bsymbolic -G -dy -z text} \
 153                    %{G:-G} \
 154                    %{YP,*} \
 155                    %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
 156                     %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
 157                    %{Qy:} %{!Qn:-Qy}"
 158 #endif
 159
 160 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o
 161    or /usr/ccs/lib/values-Xa.o for each final link step (depending
 162    upon the other gcc options selected, such as -ansi).  These files
 163    each contain one (initialized) copy of a special variable called
 164    `_lib_version'.  Each one of these files has `_lib_version' initialized
 165    to a different (enum) value.  The SVR4 library routines query the
 166    value of `_lib_version' at run to decide how they should behave.
 167    Specifically, they decide (based upon the value of `_lib_version')
 168    if they will act in a strictly ANSI conforming manner or not.  */
 169
 170 #undef  STARTFILE_SPEC
 171 #define STARTFILE_SPEC "%{!shared: \
 172                          %{!symbolic: \
 173                           %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
 174                         %{pg:gcrti.o%s}%{!pg:crti.o%s} \
 175                         %{ansi:values-Xc.o%s} \
 176                         %{!ansi:values-Xa.o%s} \
 177                         crtbegin.o%s"
 178
 179 /* The numbers used to denote specific machine registers in the System V
 180    Release 4 DWARF debugging information are quite likely to be totally
 181    different from the numbers used in BSD stabs debugging information
 182    for the same kind of target machine.  Thus, we undefine the macro
 183    DBX_REGISTER_NUMBER here as an extra inducement to get people to
 184    provide proper machine-specific definitions of DBX_REGISTER_NUMBER
 185    (which is also used to provide DWARF registers numbers in dwarfout.c)
 186    in their tm.h files which include this file.  */
 187
 188 #undef DBX_REGISTER_NUMBER
 189
 190 /* Define the actual types of some ANSI-mandated types.  (These
 191    definitions should work for most SVR4 systems).  */
 192
 193 #undef  SIZE_TYPE
 194 #define SIZE_TYPE "unsigned int"
 195
 196 #undef  PTRDIFF_TYPE
 197 #define PTRDIFF_TYPE "int"
 198
 199 #undef  WCHAR_TYPE
 200 #define WCHAR_TYPE "long int"
 201
 202 #undef  WCHAR_TYPE_SIZE
 203 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 204
 205 #define TARGET_POSIX_IO