code.delx.au - gnu-emacs/blob - src/s/gnu-linux.h

   1 /* This file is the configuration file for Linux-based GNU systems
   2    Copyright (C) 1985, 1986, 1992, 1994, 1996, 1999, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This file was put together by Michael K. Johnson and Rik Faith.  */
  21
  22
  23 /*
  24  *      Define symbols to identify the version of Unix this is.
  25  *      Define all the symbols that apply correctly.
  26  */
  27
  28 #define USG
  29 #define GNU_LINUX
  30
  31 /* SYSTEM_TYPE should indicate the kind of system you are using.
  32  It sets the Lisp variable system-type.  */
  33
  34 #define SYSTEM_TYPE "gnu/linux"         /* All the best software is free. */
  35
  36 #ifndef NOT_C_CODE
  37 #ifdef emacs
  38 #ifdef HAVE_LINUX_VERSION_H
  39 #include <linux/version.h>
  40
  41 #if LINUX_VERSION_CODE >= 0x20400
  42 /* 21 Jun 06: Eric Hanchrow <offby1@blarg.net> says this works.  */
  43 #define SIGNALS_VIA_CHARACTERS
  44 #endif /* LINUX_VERSION_CODE >= 0x20400 */
  45 #endif /* HAVE_LINUX_VERSION_H */
  46 #endif /* emacs */
  47 #endif /* NOT_C_CODE */
  48
  49 #if defined HAVE_GRANTPT
  50 #define UNIX98_PTYS
  51
  52 /* Run only once.  We need a `for'-loop because the code uses
  53    `continue'.  */
  54
  55 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  56
  57 #ifdef HAVE_GETPT
  58 #define PTY_NAME_SPRINTF
  59 #define PTY_OPEN fd = getpt ()
  60 #else /* not HAVE_GETPT */
  61 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  62 #endif /* not HAVE_GETPT */
  63
  64 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  65    prevent sigchld_handler from intercepting the child's death.  */
  66
  67 #define PTY_TTY_NAME_SPRINTF                            \
  68   {                                                     \
  69     char *ptyname;                                      \
  70                                                         \
  71     sigblock (sigmask (SIGCHLD));                       \
  72     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  73         || !(ptyname = ptsname(fd)))                    \
  74       {                                                 \
  75         sigunblock (sigmask (SIGCHLD));                 \
  76         close (fd);                                     \
  77         return -1;                                      \
  78       }                                                 \
  79     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  80     pty_name[sizeof (pty_name) - 1] = 0;                \
  81     sigunblock (sigmask (SIGCHLD));                     \
  82   }
  83
  84 #else /* not HAVE_GRANTPT */
  85
  86 /* Letter to use in finding device name of first pty,
  87    if system supports pty's.  'p' means it is /dev/ptyp0  */
  88
  89 #define FIRST_PTY_LETTER 'p'
  90
  91 #endif  /* not HAVE_GRANTPT */
  92
  93 /*  Define HAVE_TERMIOS if the system provides POSIX-style
  94     functions and macros for terminal control.  */
  95
  96 #define HAVE_TERMIOS
  97
  98 /* Define HAVE_PTYS if the system supports pty devices. */
  99
 100 #define HAVE_PTYS
 101
 102 #define HAVE_SOCKETS
 103
 104 /* Define this symbol if your system has the functions bcopy, etc. */
 105
 106 #define BSTRING
 107
 108 /* subprocesses should be defined if you want to
 109    have code for asynchronous subprocesses
 110    (as used in M-x compile and M-x shell).
 111    This is generally OS dependent, and not supported
 112    under most USG systems. */
 113
 114 #define subprocesses
 115
 116 /* define MAIL_USE_FLOCK if the mailer uses flock
 117    to interlock access to /usr/spool/mail/$USER.
 118    The alternative is that a lock file named
 119    /usr/spool/mail/$USER.lock.  */
 120
 121 /* On GNU/Linux systems, both methods are used by various mail
 122    programs.  I assume that most people are using newer mailers that
 123    have heard of flock.  Change this if you need to. */
 124 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 125    configure gets the right answers, and that means *NOT* using flock.
 126    Using flock is guaranteed to be the wrong thing. See Debian Policy
 127    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 128    Debian maintainer hasn't provided a clean fix for Emacs.
 129    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 130    HAVE_MAILLOCK_H are defined, so the following appears to be the
 131    correct logic.  -- fx */
 132 /* We must check for HAVE_LIBLOCKFILE too, as movemail does.
 133    liblockfile is a Free Software replacement for libmail, used on
 134    Debian systems and elsewhere. -rfr */
 135
 136 #if !((defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 137       defined (HAVE_MAILLOCK_H))
 138 #define MAIL_USE_FLOCK
 139 #endif
 140
 141 /* Define CLASH_DETECTION if you want lock files to be written
 142    so that Emacs can tell instantly when you try to modify
 143    a file that someone else has modified in his Emacs.  */
 144
 145 #define CLASH_DETECTION
 146
 147 /* Here, on a separate page, add any special hacks needed
 148    to make Emacs work on this system.  For example,
 149    you might define certain system call names that don't
 150    exist on your system, or that do different things on
 151    your system and must be used only through an encapsulation
 152    (Which you should place, by convention, in sysdep.c).  */
 153 \f
 154 /* This is needed for dispnew.c:update_frame */
 155
 156 #ifdef emacs
 157 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 158 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 159 /* new C libio names */
 160 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 161   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 162 #else /* !_IO_STDIO_H */
 163 /* old C++ iostream names */
 164 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 165   ((FILE)->_pptr - (FILE)->_pbase)
 166 #endif /* !_IO_STDIO_H */
 167 #endif /* emacs */
 168
 169 /* Ask GCC where to find libgcc.a.  */
 170 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 171
 172 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 173
 174 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 175    says where to find X windows at run time.  */
 176
 177 #ifdef __mips__
 178 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 179 #else
 180 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 181 #endif /* __mips__ */
 182
 183 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 184    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 185    switches, so this also works with older versions that don't implement
 186    -z combreloc.  */
 187 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 188
 189 #ifdef emacs
 190 #define INTERRUPT_INPUT
 191 #endif
 192
 193 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 194
 195 #define POSIX                 /* affects getpagesize.h and systty.h */
 196 #define POSIX_SIGNALS
 197
 198 /* Best not to include -lg, unless it is last on the command line */
 199 #define LIBS_DEBUG
 200 #undef LIB_GCC
 201 #define LIB_GCC
 202 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 203
 204 /* Don't use -g in test compiles in configure.
 205    This is so we will use the same shared libs for that linking
 206    that are used when linking temacs.  */
 207 #ifdef THIS_IS_CONFIGURE
 208 #define C_DEBUG_SWITCH
 209 #endif
 210
 211 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 212    since libc-4.4.1.  So -lipc was deleted.  */
 213 #define LIBS_SYSTEM
 214 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
 215    _GNU_SOURCE.  Left in in case it's relevant to libc5 systems and
 216    anyone's still using Emacs on those.  --fx 2002-12-14  */
 217 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 218
 219 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 220 #define LIB_MOTIF -lXm -lXpm
 221
 222 #ifdef HAVE_LIBNCURSES
 223 #define TERMINFO
 224 #define LIBS_TERMCAP -lncurses
 225 #endif
 226
 227 #define UNEXEC unexelf.o
 228
 229 /* This is to work around mysterious gcc failures in some system versions.
 230    It is unlikely that Emacs changes will work around this problem;
 231    therefore, this should remain permanently.  */
 232 #ifndef HAVE_XRMSETDATABASE
 233 #define HAVE_XRMSETDATABASE
 234 #endif
 235
 236 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 237    actually set a process group. */
 238
 239 #define BSD_PGRPS
 240
 241 #define NARROWPROTO 1
 242
 243 /* Use mmap directly for allocating larger buffers.  */
 244 #ifdef DOUG_LEA_MALLOC
 245 #undef REL_ALLOC
 246 #endif
 247
 248 /* Tell that garbage collector that setjmp is known to save all
 249    registers relevant for conservative garbage collection in the
 250    jmp_buf.  */
 251 /* Not all the architectures are tested, but there are Debian packages
 252    for SCM and/or Guile on them, so the technique must work.  See also
 253    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 254    probably safe to make this conditional just on GCC, except for ia64
 255    register window-flushing.  */
 256 /* Don't use #cpu here since in newest development versions of GCC,
 257    we must call cpp with -traditional, and that disables #cpu.  */
 258
 259 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 260     || defined __alpha__ || defined __mips__ || defined __s390__ \
 261     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 262     || defined __ia64__
 263 #define GC_SETJMP_WORKS 1
 264 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 265 #ifdef __mc68000__
 266 #define GC_LISP_OBJECT_ALIGNMENT 2
 267 #endif
 268 #ifdef __ia64__
 269 #define GC_MARK_SECONDARY_STACK()                               \
 270   do {                                                          \
 271     extern void *__libc_ia64_register_backing_store_base;       \
 272     __builtin_ia64_flushrs ();                                  \
 273     mark_memory (__libc_ia64_register_backing_store_base,       \
 274                  __builtin_ia64_bsp (), 0);                     \
 275   } while (0)
 276 #endif
 277 #endif
 278
 279 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 280    (do not change this comment) */