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, 2008, 2009, 2010 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 Under Section 7 of GPL version 3, you are granted additional
  20 permissions described in the GCC Runtime Library Exception, version
  21 3.1, as published by the Free Software Foundation.
  22
  23 You should have received a copy of the GNU General Public License and
  24 a copy of the GCC Runtime Library Exception along with this program;
  25 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  26 <http://www.gnu.org/licenses/>.  */
  27
  28
  29 /* To use this file, make up a line like that in config.gcc:
  30
  31         tm_file="$tm_file elfos.h svr4.h MACHINE/svr4.h"
  32
  33    where MACHINE is replaced by the name of the basic hardware that you
  34    are targeting for.  Then, in the file MACHINE/svr4.h, put any really
  35    system-specific defines (or overrides of defines) which you find that
  36    you need.
  37 */
  38
  39 /* Define a symbol indicating that we are using svr4.h.  */
  40 #define USING_SVR4_H
  41
  42 /* Cpp, assembler, linker, library, and startfile spec's.  */
  43
  44 /* Provide an ASM_SPEC appropriate for svr4.
  45    If we're not using GAS, we try to support as
  46    many of the specialized svr4 assembler options as seems reasonable,
  47    given that there are certain options which we can't (or shouldn't)
  48    support directly due to the fact that they conflict with other options
  49    for other svr4 tools (e.g. ld) or with other options for GCC itself.
  50    For example, we don't support the -o (output file) or -R (remove
  51    input file) options because GCC already handles these things.  We
  52    also don't support the -m (run m4) option for the assembler because
  53    that conflicts with the -m (produce load map) option of the svr4
  54    linker.  We do however allow passing arbitrary options to the svr4
  55    assembler via the -Wa, option.
  56
  57    Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
  58    option.
  59
  60    The svr4 assembler wants '-' on the command line if it's expected to
  61    read its stdin.
  62 */
  63
  64 #ifdef USE_GAS
  65 #define SVR4_ASM_SPEC \
  66   ""
  67 #else
  68 #define SVR4_ASM_SPEC \
  69   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{Ym,*} %{Yd,*}"
  70 #endif
  71
  72 #undef  ASM_SPEC
  73 #define ASM_SPEC SVR4_ASM_SPEC
  74
  75 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
  76    standard C library (unless we are building a shared library).  */
  77
  78 #undef  LIB_SPEC
  79 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
  80
  81 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
  82    magical crtend.o file (see crtstuff.c) which provides part of the
  83    support for getting C++ file-scope static object constructed before
  84    entering `main', followed by the normal svr3/svr4 "finalizer" file,
  85    which is either `gcrtn.o' or `crtn.o'.  */
  86
  87 #undef  ENDFILE_SPEC
  88 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
  89
  90 /* Provide a LINK_SPEC appropriate for svr4.  Here we provide support
  91    for the special GCC options -static, -shared, and -symbolic which
  92    allow us to link things in one of these three modes by applying the
  93    appropriate combinations of options at link-time.  We also provide
  94    support here for as many of the other svr4 linker options as seems
  95    reasonable, given that some of them conflict with options for other
  96    svr4 tools (e.g. the assembler).  In particular, we do support the
  97    -z*, -V, -t, -Qy, -Qn, and -YP* options here, and the -e*, -l*,
  98    -o*, -r, -s, -u*, and -L* options are directly supported by gcc.c
  99    itself.  We don't directly support the -m (generate load map)
 100    option because that conflicts with the -m (run m4) option of the
 101    svr4 assembler.  We also don't directly support the svr4 linker's
 102    -I* or -M* options because these conflict with existing GCC
 103    options.  We do however allow passing arbitrary options to the svr4
 104    linker via the -Wl, option, in gcc.c.  We don't support the svr4
 105    linker's -a option at all because it is totally useless and because
 106    it conflicts with GCC's own -a option.
 107
 108    Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
 109
 110    When the -G link option is used (-shared and -symbolic) a final link is
 111    not being done.  */
 112
 113 #undef  LINK_SPEC
 114 #ifdef CROSS_DIRECTORY_STRUCTURE
 115 #define LINK_SPEC "%{h*} %{v:-V} \
 116                    %{static:-dn -Bstatic} \
 117                    %{shared:-G -dy -z text} \
 118                    %{symbolic:-Bsymbolic -G -dy -z text} \
 119                    %{G:-G} \
 120                    %{YP,*} \
 121                    %{Qy:} %{!Qn:-Qy}"
 122 #else
 123 #define LINK_SPEC "%{h*} %{v:-V} \
 124                    %{static:-dn -Bstatic} \
 125                    %{shared:-G -dy -z text} \
 126                    %{symbolic:-Bsymbolic -G -dy -z text} \
 127                    %{G:-G} \
 128                    %{YP,*} \
 129                    %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
 130                     %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
 131                    %{Qy:} %{!Qn:-Qy}"
 132 #endif
 133
 134 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o
 135    or /usr/ccs/lib/values-Xa.o for each final link step (depending
 136    upon the other gcc options selected, such as -ansi).  These files
 137    each contain one (initialized) copy of a special variable called
 138    `_lib_version'.  Each one of these files has `_lib_version' initialized
 139    to a different (enum) value.  The SVR4 library routines query the
 140    value of `_lib_version' at run to decide how they should behave.
 141    Specifically, they decide (based upon the value of `_lib_version')
 142    if they will act in a strictly ANSI conforming manner or not.  */
 143
 144 #undef  STARTFILE_SPEC
 145 #define STARTFILE_SPEC "%{!shared: \
 146                          %{!symbolic: \
 147                           %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
 148                         %{pg:gcrti.o%s}%{!pg:crti.o%s} \
 149                         %{ansi:values-Xc.o%s} \
 150                         %{!ansi:values-Xa.o%s} \
 151                         crtbegin.o%s"
 152
 153 /* The numbers used to denote specific machine registers in the System V
 154    Release 4 DWARF debugging information are quite likely to be totally
 155    different from the numbers used in BSD stabs debugging information
 156    for the same kind of target machine.  Thus, we undefine the macro
 157    DBX_REGISTER_NUMBER here as an extra inducement to get people to
 158    provide proper machine-specific definitions of DBX_REGISTER_NUMBER
 159    (which is also used to provide DWARF registers numbers in dwarfout.c)
 160    in their tm.h files which include this file.  */
 161
 162 #undef DBX_REGISTER_NUMBER
 163
 164 /* Define the actual types of some ANSI-mandated types.  (These
 165    definitions should work for most SVR4 systems).  */
 166
 167 #undef  SIZE_TYPE
 168 #define SIZE_TYPE "unsigned int"
 169
 170 #undef  PTRDIFF_TYPE
 171 #define PTRDIFF_TYPE "int"
 172
 173 #undef  WCHAR_TYPE
 174 #define WCHAR_TYPE "long int"
 175
 176 #undef  WCHAR_TYPE_SIZE
 177 #define WCHAR_TYPE_SIZE BITS_PER_WORD