gcc/config/ptx4.h

   1 /* Operating system specific defines to be used when targeting GCC for some
   2    generic System V Release 4 system.
   3    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   4    Contributed by Ron Guilmette (rfg@monkeys.com).
   5    Renamed and changed to suit Dynix/ptx v4 and later.
   6    Modified by Tim Wright (timw@sequent.com).
   7    Modified by Janis Johnson (janis@us.ibm.com).
   8
   9 This file is part of GNU CC.
  10
  11 GNU CC is free software; you can redistribute it and/or modify
  12 it under the terms of the GNU General Public License as published by
  13 the Free Software Foundation; either version 2, or (at your option)
  14 any later version.
  15
  16 GNU CC is distributed in the hope that it will be useful,
  17 but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 GNU General Public License for more details.
  20
  21 You should have received a copy of the GNU General Public License
  22 along with GNU CC; see the file COPYING.  If not, write to
  23 the Free Software Foundation, 59 Temple Place - Suite 330,
  24 Boston, MA 02111-1307, USA.
  25
  26 */
  27
  28 /* Define a symbol indicating that we are using svr4.h.  */
  29 #define USING_SVR4_H
  30
  31 /* Use DWARF debugging info by default.  */
  32
  33 #ifndef PREFERRED_DEBUGGING_TYPE
  34 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
  35 #endif
  36
  37 #include "elfos.h"
  38
  39 /* Cpp, assembler, linker, library, and startfile spec's.  */
  40
  41 /* This defines which switch letters take arguments.  On svr4, most of
  42    the normal cases (defined in gcc.c) apply, and we also have -h* and
  43    -z* options (for the linker).  Note however that there is no such
  44    thing as a -T option for svr4.  */
  45
  46 #define SWITCH_TAKES_ARG(CHAR) \
  47   (   (CHAR) == 'D' \
  48    || (CHAR) == 'U' \
  49    || (CHAR) == 'o' \
  50    || (CHAR) == 'e' \
  51    || (CHAR) == 'u' \
  52    || (CHAR) == 'I' \
  53    || (CHAR) == 'm' \
  54    || (CHAR) == 'L' \
  55    || (CHAR) == 'A' \
  56    || (CHAR) == 'h' \
  57    || (CHAR) == 'z')
  58
  59 /* This defines which multi-letter switches take arguments.  On svr4,
  60    there are no such switches except those implemented by GCC itself.  */
  61
  62 #define WORD_SWITCH_TAKES_ARG(STR)                      \
  63  (DEFAULT_WORD_SWITCH_TAKES_ARG (STR)                   \
  64   && strcmp (STR, "Tdata") && strcmp (STR, "Ttext")     \
  65   && strcmp (STR, "Tbss"))
  66
  67 /* You should redefine CPP_PREDEFINES in any file which includes this one.
  68    The definition should be appropriate for the type of target system
  69    involved, and it should include any -A (assertion) options which are
  70    appropriate for the given target system.  */
  71 #undef CPP_PREDEFINES
  72
  73 /* Provide an ASM_SPEC appropriate for svr4.  Here we try to support as
  74    many of the specialized svr4 assembler options as seems reasonable,
  75    given that there are certain options which we can't (or shouldn't)
  76    support directly due to the fact that they conflict with other options
  77    for other svr4 tools (e.g. ld) or with other options for GCC itself.
  78    For example, we don't support the -o (output file) or -R (remove
  79    input file) options because GCC already handles these things.  We
  80    also don't support the -m (run m4) option for the assembler because
  81    that conflicts with the -m (produce load map) option of the svr4
  82    linker.  We do however allow passing arbitrary options to the svr4
  83    assembler via the -Wa, option.
  84
  85    Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
  86    option.
  87 */
  88
  89 #undef ASM_SPEC
  90 #ifdef USE_GAS
  91 #define ASM_SPEC \
  92   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  93 #else
  94 #define ASM_SPEC \
  95   "-no_0f_fix -no_eflags_chk %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  96 #endif
  97
  98 /* svr4 assemblers need the `-' (indicating input from stdin) to come after
  99    the -o option (and its argument) for some reason.  If we try to put it
 100    before the -o option, the assembler will try to read the file named as
 101    the output file in the -o option as an input file (after it has already
 102    written some stuff to it) and the binary stuff contained therein will
 103    cause totally confuse the assembler, resulting in many spurious error
 104    messages.  */
 105
 106 #undef ASM_FINAL_SPEC
 107 #define ASM_FINAL_SPEC "%{pipe:-}"
 108
 109 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
 110    standard C library (unless we are building a shared library).  */
 111
 112 #undef  LIB_SPEC
 113 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
 114
 115 /* Provide a LIBGCC_SPEC appropriate for svr4.  We also want to exclude
 116    libgcc when -symbolic.  */
 117
 118 #undef  LIBGCC_SPEC
 119 #define LIBGCC_SPEC "%{!shared:%{!symbolic:-lgcc}}"
 120
 121 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
 122    magical crtend.o file (see crtstuff.c) which provides part of the
 123    support for getting C++ file-scope static object constructed before
 124    entering `main', followed by the normal svr3/svr4 "finalizer" file,
 125    which is either `gcrtn.o' or `crtn.o'.  */
 126
 127 #undef  ENDFILE_SPEC
 128 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o}%{!pg:crtn.o%s}"
 129
 130 /* Provide a LINK_SPEC appropriate for svr4.  Here we provide support
 131    for the special GCC options -static, -shared, and -symbolic which
 132    allow us to link things in one of these three modes by applying the
 133    appropriate combinations of options at link-time.  We also provide
 134    support here for as many of the other svr4 linker options as seems
 135    reasonable, given that some of them conflict with options for other
 136    svr4 tools (e.g. the assembler).  In particular, we do support the
 137    -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
 138    -l*, -o*, -r, -s, -u*, and -L* options are directly supported
 139    by gcc.c itself.  We don't directly support the -m (generate load
 140    map) option because that conflicts with the -m (run m4) option of
 141    the svr4 assembler.  We also don't directly support the svr4 linker's
 142    -I* or -M* options because these conflict with existing GCC options.
 143    We do however allow passing arbitrary options to the svr4 linker
 144    via the -Wl, option.  We don't support the svr4 linker's -a option
 145    at all because it is totally useless and because it conflicts with
 146    GCC's own -a option.
 147
 148    Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
 149
 150    When the -G link option is used (-shared and -symbolic) a final link is
 151    not being done.  */
 152
 153 #undef  LINK_SPEC
 154 #define LINK_SPEC "%{h*} %{v:-V} \
 155                    %{b} %{Wl,*:%*} \
 156                    %{static:-dn -Bstatic} \
 157                    %{shared:-G -dy -z text} \
 158                    %{symbolic:-Bsymbolic -G -dy -z text} \
 159                    %{G:-G} \
 160                    %{YP,*} \
 161                    %{!YP,*:%{p:-Y P,/lib/libp:/usr/lib/libp:/lib:/usr/lib} \
 162                     %{!p:-Y P,/lib:/usr/lib}} \
 163                    %{Qy:} %{!Qn:-Qy}"
 164
 165 /* Gcc automatically adds in one of the files /lib/values-Xc.o,
 166    /lib/values-Xa.o, or /lib/values-Xt.o for each final link
 167    step (depending upon the other gcc options selected, such as
 168    -traditional and -ansi).  These files each contain one (initialized)
 169    copy of a special variable called `_lib_version'.  Each one of these
 170    files has `_lib_version' initialized to a different (enum) value.
 171    The SVR4 library routines query the value of `_lib_version' at run
 172    to decide how they should behave.  Specifically, they decide (based
 173    upon the value of `_lib_version') if they will act in a strictly ANSI
 174    conforming manner or not.
 175 */
 176
 177 #undef  STARTFILE_SPEC
 178 #define STARTFILE_SPEC "%{!shared: \
 179                          %{!symbolic: \
 180                           %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
 181                         %{pg:gcrti.o%s}%{!pg:crti.o%s} \
 182                         %{ansi:values-Xc.o%s} \
 183                         %{!ansi: \
 184                          %{traditional:values-Xt.o%s} \
 185                          %{!traditional:values-Xa.o%s}} \
 186                         crtbegin.o%s"
 187
 188 /* Allow #sccs in preprocessor.  */
 189
 190 #define SCCS_DIRECTIVE
 191
 192 /* Don't use bcopy, which doesn't handle overlaps before DYNIX/ptx 4.6. */
 193
 194 #undef HAVE_BCOPY
 195
 196 /* The numbers used to denote specific machine registers in the System V
 197    Release 4 DWARF debugging information are quite likely to be totally
 198    different from the numbers used in BSD stabs debugging information
 199    for the same kind of target machine.  Thus, we undefine the macro
 200    DBX_REGISTER_NUMBER here as an extra inducement to get people to
 201    provide proper machine-specific definitions of DBX_REGISTER_NUMBER
 202    (which is also used to provide DWARF registers numbers in dwarfout.c)
 203    in their tm.h files which include this file.  */
 204
 205 #undef DBX_REGISTER_NUMBER
 206
 207 /* Like block addresses, stabs line numbers are relative to the
 208    current function.  */
 209
 210 #undef ASM_OUTPUT_SOURCE_LINE
 211 #define ASM_OUTPUT_SOURCE_LINE(file, line)                              \
 212 do                                                                      \
 213   {                                                                     \
 214     static int sym_lineno = 1;                                          \
 215     fprintf (file, ".stabn 68,0,%d,.LM%d-",                             \
 216              line, sym_lineno);                                         \
 217     assemble_name (file,                                                \
 218                    XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
 219     fprintf (file, "\n.LM%d:\n", sym_lineno);                           \
 220     sym_lineno += 1;                                                    \
 221   }                                                                     \
 222 while (0)
 223
 224 /* Generate a blank trailing N_SO to mark the end of the .o file, since
 225    we can't depend upon the linker to mark .o file boundaries with
 226    embedded stabs.  */
 227
 228 #undef DBX_OUTPUT_MAIN_SOURCE_FILE_END
 229 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME)                 \
 230   fprintf (FILE,                                                        \
 231            "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
 232
 233 /* Define the actual types of some ANSI-mandated types.  (These
 234    definitions should work for most SVR4 systems).  */
 235
 236 #undef SIZE_TYPE
 237 #define SIZE_TYPE "unsigned int"
 238
 239 #undef PTRDIFF_TYPE
 240 #define PTRDIFF_TYPE "int"
 241
 242 #undef WCHAR_TYPE
 243 #define WCHAR_TYPE "long int"
 244
 245 #undef WCHAR_TYPE_SIZE
 246 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 247
 248 /* This says how to output assembler code to declare an uninitialized
 249    external linkage data item.  There's a bug in the DYNIX/ptx linker
 250    (PR 254649) when the alignment for such an object is specified, so
 251    ignore the ALIGN parameter. */
 252
 253 #undef ASM_OUTPUT_ALIGNED_COMMON
 254 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 255 do {                                                                    \
 256   fprintf ((FILE), "%s", COMMON_ASM_OP);                                \
 257   assemble_name ((FILE), (NAME));                                       \
 258   fprintf ((FILE), ",%u\n", (SIZE));                                    \
 259 } while (0)