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 #undef PREFERRED_DEBUGGING_TYPE
  34 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
  35
  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 #define SWITCH_TAKES_ARG(CHAR) \
  45   (   (CHAR) == 'D' \
  46    || (CHAR) == 'U' \
  47    || (CHAR) == 'o' \
  48    || (CHAR) == 'e' \
  49    || (CHAR) == 'u' \
  50    || (CHAR) == 'I' \
  51    || (CHAR) == 'm' \
  52    || (CHAR) == 'L' \
  53    || (CHAR) == 'A' \
  54    || (CHAR) == 'h' \
  55    || (CHAR) == 'z')
  56
  57 /* This defines which multi-letter switches take arguments.  On svr4,
  58    there are no such switches except those implemented by GCC itself.  */
  59
  60 #define WORD_SWITCH_TAKES_ARG(STR)                      \
  61  (DEFAULT_WORD_SWITCH_TAKES_ARG (STR)                   \
  62   && strcmp (STR, "Tdata") && strcmp (STR, "Ttext")     \
  63   && strcmp (STR, "Tbss"))
  64
  65 /* Provide an ASM_SPEC appropriate for svr4.  Here we try to support as
  66    many of the specialized svr4 assembler options as seems reasonable,
  67    given that there are certain options which we can't (or shouldn't)
  68    support directly due to the fact that they conflict with other options
  69    for other svr4 tools (e.g. ld) or with other options for GCC itself.
  70    For example, we don't support the -o (output file) or -R (remove
  71    input file) options because GCC already handles these things.  We
  72    also don't support the -m (run m4) option for the assembler because
  73    that conflicts with the -m (produce load map) option of the svr4
  74    linker.  We do however allow passing arbitrary options to the svr4
  75    assembler via the -Wa, option.
  76
  77    Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
  78    option.
  79 */
  80
  81 #undef ASM_SPEC
  82 #ifdef USE_GAS
  83 #define ASM_SPEC \
  84   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  85 #else
  86 #define ASM_SPEC \
  87   "-no_0f_fix -no_eflags_chk %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  88 #endif
  89
  90 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
  91
  92 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
  93    standard C library (unless we are building a shared library).  */
  94
  95 #undef  LIB_SPEC
  96 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
  97
  98 /* Provide a LIBGCC_SPEC appropriate for svr4.  We also want to exclude
  99    libgcc when -symbolic.  */
 100
 101 #undef  LIBGCC_SPEC
 102 #define LIBGCC_SPEC "%{!shared:%{!symbolic:-lgcc}}"
 103
 104 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
 105    magical crtend.o file (see crtstuff.c) which provides part of the
 106    support for getting C++ file-scope static object constructed before
 107    entering `main', followed by the normal svr3/svr4 "finalizer" file,
 108    which is either `gcrtn.o' or `crtn.o'.  */
 109
 110 #undef  ENDFILE_SPEC
 111 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o}%{!pg:crtn.o%s}"
 112
 113 /* Provide a LINK_SPEC appropriate for svr4.  Here we provide support
 114    for the special GCC options -static, -shared, and -symbolic which
 115    allow us to link things in one of these three modes by applying the
 116    appropriate combinations of options at link-time.  We also provide
 117    support here for as many of the other svr4 linker options as seems
 118    reasonable, given that some of them conflict with options for other
 119    svr4 tools (e.g. the assembler).  In particular, we do support the
 120    -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
 121    -l*, -o*, -r, -s, -u*, and -L* options are directly supported
 122    by gcc.c itself.  We don't directly support the -m (generate load
 123    map) option because that conflicts with the -m (run m4) option of
 124    the svr4 assembler.  We also don't directly support the svr4 linker's
 125    -I* or -M* options because these conflict with existing GCC options.
 126    We do however allow passing arbitrary options to the svr4 linker
 127    via the -Wl, option.  We don't support the svr4 linker's -a option
 128    at all because it is totally useless and because it conflicts with
 129    GCC's own -a option.
 130
 131    Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
 132
 133    When the -G link option is used (-shared and -symbolic) a final link is
 134    not being done.  */
 135
 136 #undef  LINK_SPEC
 137 #define LINK_SPEC "%{h*} %{v:-V} \
 138                    %{b} %{Wl,*:%*} \
 139                    %{static:-dn -Bstatic} \
 140                    %{shared:-G -dy -z text} \
 141                    %{symbolic:-Bsymbolic -G -dy -z text} \
 142                    %{G:-G} \
 143                    %{YP,*} \
 144                    %{!YP,*:%{p:-Y P,/lib/libp:/usr/lib/libp:/lib:/usr/lib} \
 145                     %{!p:-Y P,/lib:/usr/lib}} \
 146                    %{Qy:} %{!Qn:-Qy}"
 147
 148 /* Gcc automatically adds in one of the files /lib/values-Xc.o
 149    or /lib/values-Xa.o, for each final link step (depending upon the other
 150    gcc options selected, such as -ansi).  These files each contain one
 151    (initialized) copy of a special variable called `_lib_version'.  Each
 152    one of these files has `_lib_version' initialized to a different (enum)
 153    value.  The SVR4 library routines query the value of `_lib_version'
 154    at run to decide how they should behave.  Specifically, they decide
 155    (based upon the value of `_lib_version') if they will act in a strictly
 156    ANSI conforming manner or not.
 157 */
 158
 159 #undef  STARTFILE_SPEC
 160 #define STARTFILE_SPEC "%{!shared: \
 161                          %{!symbolic: \
 162                           %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
 163                         %{pg:gcrti.o%s}%{!pg:crti.o%s} \
 164                         %{ansi:values-Xc.o%s} \
 165                         %{!ansi:values-Xa.o%s} \
 166                         crtbegin.o%s"
 167
 168 /* Don't use bcopy, which doesn't handle overlaps before DYNIX/ptx 4.6.  */
 169
 170 #undef HAVE_BCOPY
 171
 172 /* The numbers used to denote specific machine registers in the System V
 173    Release 4 DWARF debugging information are quite likely to be totally
 174    different from the numbers used in BSD stabs debugging information
 175    for the same kind of target machine.  Thus, we undefine the macro
 176    DBX_REGISTER_NUMBER here as an extra inducement to get people to
 177    provide proper machine-specific definitions of DBX_REGISTER_NUMBER
 178    (which is also used to provide DWARF registers numbers in dwarfout.c)
 179    in their tm.h files which include this file.  */
 180
 181 #undef DBX_REGISTER_NUMBER
 182
 183 /* Like block addresses, stabs line numbers are relative to the
 184    current function.  */
 185
 186 #undef ASM_OUTPUT_SOURCE_LINE
 187 #define ASM_OUTPUT_SOURCE_LINE(file, line)                              \
 188 do                                                                      \
 189   {                                                                     \
 190     static int sym_lineno = 1;                                          \
 191     fprintf (file, ".stabn 68,0,%d,.LM%d-",                             \
 192              line, sym_lineno);                                         \
 193     assemble_name (file,                                                \
 194                    XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
 195     fprintf (file, "\n.LM%d:\n", sym_lineno);                           \
 196     sym_lineno += 1;                                                    \
 197   }                                                                     \
 198 while (0)
 199
 200 /* Generate a blank trailing N_SO to mark the end of the .o file, since
 201    we can't depend upon the linker to mark .o file boundaries with
 202    embedded stabs.  */
 203
 204 #undef DBX_OUTPUT_MAIN_SOURCE_FILE_END
 205 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME)                 \
 206   fprintf (FILE,                                                        \
 207            "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
 208
 209 /* Define the actual types of some ANSI-mandated types.  (These
 210    definitions should work for most SVR4 systems).  */
 211
 212 #undef SIZE_TYPE
 213 #define SIZE_TYPE "unsigned int"
 214
 215 #undef PTRDIFF_TYPE
 216 #define PTRDIFF_TYPE "int"
 217
 218 #undef WCHAR_TYPE
 219 #define WCHAR_TYPE "long int"
 220
 221 #undef WCHAR_TYPE_SIZE
 222 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 223
 224 /* This says how to output assembler code to declare an uninitialized
 225    external linkage data item.  There's a bug in the DYNIX/ptx linker
 226    (PR 254649) when the alignment for such an object is specified, so
 227    ignore the ALIGN parameter.  */
 228
 229 #undef ASM_OUTPUT_ALIGNED_COMMON
 230 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 231 do {                                                                    \
 232   fprintf ((FILE), "%s", COMMON_ASM_OP);                                \
 233   assemble_name ((FILE), (NAME));                                       \
 234   fprintf ((FILE), ",%u\n", (SIZE));                                    \
 235 } while (0)