mac/inc/m-mac.h

   1 /* Handcrafted m-mac.h file for building GNU Emacs on the Macintosh.
   2    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* Contributed by Andrew Choi (akochoi@mac.com).  */
  22
  23 /* The following line tells the configuration script what sort of
  24    operating system this machine is likely to run.
  25    USUAL-OPSYS="<name of system .h file here, without the s- or .h>"  */
  26
  27 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  28    is the most significant byte.  */
  29
  30 #define WORDS_BIG_ENDIAN
  31
  32 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  33  * group of arguments and treat it as an array of the arguments.  */
  34
  35 #define NO_ARG_ARRAY
  36
  37 /* Define WORD_MACHINE if addresses and such have
  38  * to be corrected before they can be used as byte counts.  */
  39
  40 /* #define WORD_MACHINE */
  41
  42 /* Now define a symbol for the cpu type, if your compiler
  43    does not define it automatically:
  44    Ones defined so far include vax, m68000, ns16000, pyramid,
  45    orion, tahoe, APOLLO and many others */
  46
  47 /* Use type int rather than a union, to represent Lisp_Object */
  48 /* This is desirable for most machines.  */
  49
  50 #define NO_UNION_TYPE
  51
  52 /* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
  53    the 24-bit bit field into an int.  In other words, if bit fields
  54    are always unsigned.
  55
  56    If you use NO_UNION_TYPE, this flag does not matter.  */
  57
  58 #define EXPLICIT_SIGN_EXTEND
  59
  60 /* Data type of load average, as read out of kmem.  */
  61
  62 /* #define LOAD_AVE_TYPE long */
  63
  64 /* Convert that into an integer that is 100 for a load average of 1.0  */
  65
  66 /* #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE) */
  67
  68 /* Define CANNOT_DUMP on machines where unexec does not work.
  69    Then the function dump-emacs will not be defined
  70    and temacs will do (load "loadup") automatically unless told otherwise.  */
  71
  72 #define CANNOT_DUMP
  73
  74 /* Define VIRT_ADDR_VARIES if the virtual addresses of
  75    pure and impure space as loaded can vary, and even their
  76    relative order cannot be relied on.
  77
  78    Otherwise Emacs assumes that text space precedes data space,
  79    numerically.  */
  80
  81 #define VIRT_ADDR_VARIES
  82
  83 /* Define C_ALLOCA if this machine does not support a true alloca
  84    and the one written in C should be used instead.
  85    Define HAVE_ALLOCA to say that the system provides a properly
  86    working alloca function and it should be used.
  87    Define neither one if an assembler-language alloca
  88    in the file alloca.s should be used.  */
  89
  90 #define C_ALLOCA
  91 /* #define HAVE_ALLOCA */
  92
  93 /* Define NO_REMAP if memory segmentation makes it not work well
  94    to change the boundary between the text section and data section
  95    when Emacs is dumped.  If you define this, the preloaded Lisp
  96    code will not be sharable; but that's better than failing completely.  */
  97
  98 /* #define NO_REMAP */
  99
 100 /* Some really obscure 4.2-based systems (like Sequent DYNIX)
 101  * do not support asynchronous I/O (using SIGIO) on sockets,
 102  * even though it works fine on tty's.  If you have one of
 103  * these systems, define the following, and then use it in
 104  * config.h (or elsewhere) to decide when (not) to use SIGIO.
 105  *
 106  * You'd think this would go in an operating-system description file,
 107  * but since it only occurs on some, but not all, BSD systems, the
 108  * reasonable place to select for it is in the machine description
 109  * file.
 110  */
 111
 112 #define NO_SOCK_SIGIO
 113
 114
 115 /* After adding support for a new system, modify the large case
 116    statement in the `configure' script to recognize reasonable
 117    configuration names, and add a description of the system to
 118    `etc/MACHINES'.
 119
 120    If you've just fixed a problem in an existing configuration file,
 121    you should also check `etc/MACHINES' to make sure its descriptions
 122    of known problems in that configuration should be updated.  */
 123
 124 /* MPW build crashes if this is not defined.  */
 125 #ifdef __MRC__
 126 #define IEEE_FLOATING_POINT 1
 127 #endif
 128
 129 #if 0
 130 /* The usual definition of XINT, which involves shifting, does not
 131    sign-extend properly on this machine.  */
 132
 133 #define XINT(i) (((sign_extend_temp=(i)) & 0x00800000) \
 134                  ? (sign_extend_temp | 0xFF000000) \
 135                  : (sign_extend_temp & 0x00FFFFFF))
 136
 137 #ifdef emacs /* Don't do this when making xmakefile! */
 138 extern int sign_extend_temp;
 139 #endif
 140 #endif