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 /* You should redefine CPP_PREDEFINES in any file which includes this one.
  66    The definition should be appropriate for the type of target system
  67    involved, and it should include any -A (assertion) options which are
  68    appropriate for the given target system.  */
  69 #undef CPP_PREDEFINES
  70
  71 /* Provide an ASM_SPEC appropriate for svr4.  Here we try to support as
  72    many of the specialized svr4 assembler options as seems reasonable,
  73    given that there are certain options which we can't (or shouldn't)
  74    support directly due to the fact that they conflict with other options
  75    for other svr4 tools (e.g. ld) or with other options for GCC itself.
  76    For example, we don't support the -o (output file) or -R (remove
  77    input file) options because GCC already handles these things.  We
  78    also don't support the -m (run m4) option for the assembler because
  79    that conflicts with the -m (produce load map) option of the svr4
  80    linker.  We do however allow passing arbitrary options to the svr4
  81    assembler via the -Wa, option.
  82
  83    Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
  84    option.
  85 */
  86
  87 #undef ASM_SPEC
  88 #ifdef USE_GAS
  89 #define ASM_SPEC \
  90   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  91 #else
  92 #define ASM_SPEC \
  93   "-no_0f_fix -no_eflags_chk %{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  94 #endif
  95
  96 /* svr4 assemblers need the `-' (indicating input from stdin) to come after
  97    the -o option (and its argument) for some reason.  If we try to put it
  98    before the -o option, the assembler will try to read the file named as
  99    the output file in the -o option as an input file (after it has already
 100    written some stuff to it) and the binary stuff contained therein will
 101    cause totally confuse the assembler, resulting in many spurious error
 102    messages.  */
 103
 104 #undef ASM_FINAL_SPEC
 105 #define ASM_FINAL_SPEC "%{pipe:-}"
 106
 107 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
 108    standard C library (unless we are building a shared library).  */
 109
 110 #undef  LIB_SPEC
 111 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
 112
 113 /* Provide a LIBGCC_SPEC appropriate for svr4.  We also want to exclude
 114    libgcc when -symbolic.  */
 115
 116 #undef  LIBGCC_SPEC
 117 #define LIBGCC_SPEC "%{!shared:%{!symbolic:-lgcc}}"
 118
 119 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
 120    magical crtend.o file (see crtstuff.c) which provides part of the
 121    support for getting C++ file-scope static object constructed before
 122    entering `main', followed by the normal svr3/svr4 "finalizer" file,
 123    which is either `gcrtn.o' or `crtn.o'.  */
 124
 125 #undef  ENDFILE_SPEC
 126 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o}%{!pg:crtn.o%s}"
 127
 128 /* Provide a LINK_SPEC appropriate for svr4.  Here we provide support
 129    for the special GCC options -static, -shared, and -symbolic which
 130    allow us to link things in one of these three modes by applying the
 131    appropriate combinations of options at link-time.  We also provide
 132    support here for as many of the other svr4 linker options as seems
 133    reasonable, given that some of them conflict with options for other
 134    svr4 tools (e.g. the assembler).  In particular, we do support the
 135    -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*,
 136    -l*, -o*, -r, -s, -u*, and -L* options are directly supported
 137    by gcc.c itself.  We don't directly support the -m (generate load
 138    map) option because that conflicts with the -m (run m4) option of
 139    the svr4 assembler.  We also don't directly support the svr4 linker's
 140    -I* or -M* options because these conflict with existing GCC options.
 141    We do however allow passing arbitrary options to the svr4 linker
 142    via the -Wl, option.  We don't support the svr4 linker's -a option
 143    at all because it is totally useless and because it conflicts with
 144    GCC's own -a option.
 145
 146    Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
 147
 148    When the -G link option is used (-shared and -symbolic) a final link is
 149    not being done.  */
 150
 151 #undef  LINK_SPEC
 152 #define LINK_SPEC "%{h*} %{v:-V} \
 153                    %{b} %{Wl,*:%*} \
 154                    %{static:-dn -Bstatic} \
 155                    %{shared:-G -dy -z text} \
 156                    %{symbolic:-Bsymbolic -G -dy -z text} \
 157                    %{G:-G} \
 158                    %{YP,*} \
 159                    %{!YP,*:%{p:-Y P,/lib/libp:/usr/lib/libp:/lib:/usr/lib} \
 160                     %{!p:-Y P,/lib:/usr/lib}} \
 161                    %{Qy:} %{!Qn:-Qy}"
 162
 163 /* Gcc automatically adds in one of the files /lib/values-Xc.o
 164    or /lib/values-Xa.o, for each final link step (depending upon the other
 165    gcc options selected, such as -ansi).  These files each contain one
 166    (initialized) copy of a special variable called `_lib_version'.  Each
 167    one of these files has `_lib_version' initialized to a different (enum)
 168    value.  The SVR4 library routines query the value of `_lib_version'
 169    at run to decide how they should behave.  Specifically, they decide
 170    (based upon the value of `_lib_version') if they will act in a strictly
 171    ANSI conforming manner or not.
 172 */
 173
 174 #undef  STARTFILE_SPEC
 175 #define STARTFILE_SPEC "%{!shared: \
 176                          %{!symbolic: \
 177                           %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
 178                         %{pg:gcrti.o%s}%{!pg:crti.o%s} \
 179                         %{ansi:values-Xc.o%s} \
 180                         %{!ansi:values-Xa.o%s} \
 181                         crtbegin.o%s"
 182
 183 /* Allow #sccs in preprocessor.  */
 184
 185 #define SCCS_DIRECTIVE
 186
 187 /* Don't use bcopy, which doesn't handle overlaps before DYNIX/ptx 4.6. */
 188
 189 #undef HAVE_BCOPY
 190
 191 /* The numbers used to denote specific machine registers in the System V
 192    Release 4 DWARF debugging information are quite likely to be totally
 193    different from the numbers used in BSD stabs debugging information
 194    for the same kind of target machine.  Thus, we undefine the macro
 195    DBX_REGISTER_NUMBER here as an extra inducement to get people to
 196    provide proper machine-specific definitions of DBX_REGISTER_NUMBER
 197    (which is also used to provide DWARF registers numbers in dwarfout.c)
 198    in their tm.h files which include this file.  */
 199
 200 #undef DBX_REGISTER_NUMBER
 201
 202 /* Like block addresses, stabs line numbers are relative to the
 203    current function.  */
 204
 205 #undef ASM_OUTPUT_SOURCE_LINE
 206 #define ASM_OUTPUT_SOURCE_LINE(file, line)                              \
 207 do                                                                      \
 208   {                                                                     \
 209     static int sym_lineno = 1;                                          \
 210     fprintf (file, ".stabn 68,0,%d,.LM%d-",                             \
 211              line, sym_lineno);                                         \
 212     assemble_name (file,                                                \
 213                    XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0));\
 214     fprintf (file, "\n.LM%d:\n", sym_lineno);                           \
 215     sym_lineno += 1;                                                    \
 216   }                                                                     \
 217 while (0)
 218
 219 /* Generate a blank trailing N_SO to mark the end of the .o file, since
 220    we can't depend upon the linker to mark .o file boundaries with
 221    embedded stabs.  */
 222
 223 #undef DBX_OUTPUT_MAIN_SOURCE_FILE_END
 224 #define DBX_OUTPUT_MAIN_SOURCE_FILE_END(FILE, FILENAME)                 \
 225   fprintf (FILE,                                                        \
 226            "\t.text\n\t.stabs \"\",%d,0,0,.Letext\n.Letext:\n", N_SO)
 227
 228 /* Define the actual types of some ANSI-mandated types.  (These
 229    definitions should work for most SVR4 systems).  */
 230
 231 #undef SIZE_TYPE
 232 #define SIZE_TYPE "unsigned int"
 233
 234 #undef PTRDIFF_TYPE
 235 #define PTRDIFF_TYPE "int"
 236
 237 #undef WCHAR_TYPE
 238 #define WCHAR_TYPE "long int"
 239
 240 #undef WCHAR_TYPE_SIZE
 241 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 242
 243 /* This says how to output assembler code to declare an uninitialized
 244    external linkage data item.  There's a bug in the DYNIX/ptx linker
 245    (PR 254649) when the alignment for such an object is specified, so
 246    ignore the ALIGN parameter. */
 247
 248 #undef ASM_OUTPUT_ALIGNED_COMMON
 249 #define ASM_OUTPUT_ALIGNED_COMMON(FILE, NAME, SIZE, ALIGN)              \
 250 do {                                                                    \
 251   fprintf ((FILE), "%s", COMMON_ASM_OP);                                \
 252   assemble_name ((FILE), (NAME));                                       \
 253   fprintf ((FILE), ",%u\n", (SIZE));                                    \
 254 } while (0)