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 /* define MAIL_USE_FLOCK if the mailer uses flock
 109    to interlock access to /usr/spool/mail/$USER.
 110    The alternative is that a lock file named
 111    /usr/spool/mail/$USER.lock.  */
 112
 113 /* On GNU/Linux systems, both methods are used by various mail
 114    programs.  I assume that most people are using newer mailers that
 115    have heard of flock.  Change this if you need to. */
 116 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 117    configure gets the right answers, and that means *NOT* using flock.
 118    Using flock is guaranteed to be the wrong thing. See Debian Policy
 119    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 120    Debian maintainer hasn't provided a clean fix for Emacs.
 121    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 122    HAVE_MAILLOCK_H are defined, so the following appears to be the
 123    correct logic.  -- fx */
 124 /* We must check for HAVE_LIBLOCKFILE too, as movemail does.
 125    liblockfile is a Free Software replacement for libmail, used on
 126    Debian systems and elsewhere. -rfr */
 127
 128 #if !((defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 129       defined (HAVE_MAILLOCK_H))
 130 #define MAIL_USE_FLOCK
 131 #endif
 132
 133 /* Define CLASH_DETECTION if you want lock files to be written
 134    so that Emacs can tell instantly when you try to modify
 135    a file that someone else has modified in his Emacs.  */
 136
 137 #define CLASH_DETECTION
 138
 139 /* Here, on a separate page, add any special hacks needed
 140    to make Emacs work on this system.  For example,
 141    you might define certain system call names that don't
 142    exist on your system, or that do different things on
 143    your system and must be used only through an encapsulation
 144    (Which you should place, by convention, in sysdep.c).  */
 145 \f
 146 /* This is needed for dispnew.c:update_frame */
 147
 148 #ifdef emacs
 149 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 150 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 151 /* new C libio names */
 152 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 153   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 154 #else /* !_IO_STDIO_H */
 155 /* old C++ iostream names */
 156 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 157   ((FILE)->_pptr - (FILE)->_pbase)
 158 #endif /* !_IO_STDIO_H */
 159 #endif /* emacs */
 160
 161 /* Ask GCC where to find libgcc.a.  */
 162 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 163
 164 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 165
 166 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 167    says where to find X windows at run time.  */
 168
 169 #ifdef __mips__
 170 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 171 #else
 172 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 173 #endif /* __mips__ */
 174
 175 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 176    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 177    switches, so this also works with older versions that don't implement
 178    -z combreloc.  */
 179 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 180
 181 #ifdef emacs
 182 #define INTERRUPT_INPUT
 183 #endif
 184
 185 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 186
 187 #define POSIX                 /* affects getpagesize.h and systty.h */
 188 #define POSIX_SIGNALS
 189
 190 /* Best not to include -lg, unless it is last on the command line */
 191 #define LIBS_DEBUG
 192 #undef LIB_GCC
 193 #define LIB_GCC
 194 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 195
 196 /* Don't use -g in test compiles in configure.
 197    This is so we will use the same shared libs for that linking
 198    that are used when linking temacs.  */
 199 #ifdef THIS_IS_CONFIGURE
 200 #define C_DEBUG_SWITCH
 201 #endif
 202
 203 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 204    since libc-4.4.1.  So -lipc was deleted.  */
 205 #define LIBS_SYSTEM
 206 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
 207    _GNU_SOURCE.  Left in in case it's relevant to libc5 systems and
 208    anyone's still using Emacs on those.  --fx 2002-12-14  */
 209 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 210
 211 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 212 #define LIB_MOTIF -lXm -lXpm
 213
 214 #ifdef HAVE_LIBNCURSES
 215 #define TERMINFO
 216 #define LIBS_TERMCAP -lncurses
 217 #endif
 218
 219 #define UNEXEC unexelf.o
 220
 221 /* This is to work around mysterious gcc failures in some system versions.
 222    It is unlikely that Emacs changes will work around this problem;
 223    therefore, this should remain permanently.  */
 224 #ifndef HAVE_XRMSETDATABASE
 225 #define HAVE_XRMSETDATABASE
 226 #endif
 227
 228 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 229    actually set a process group. */
 230
 231 #define BSD_PGRPS
 232
 233 #define NARROWPROTO 1
 234
 235 /* Use mmap directly for allocating larger buffers.  */
 236 #ifdef DOUG_LEA_MALLOC
 237 #undef REL_ALLOC
 238 #endif
 239
 240 /* Tell that garbage collector that setjmp is known to save all
 241    registers relevant for conservative garbage collection in the
 242    jmp_buf.  */
 243 /* Not all the architectures are tested, but there are Debian packages
 244    for SCM and/or Guile on them, so the technique must work.  See also
 245    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 246    probably safe to make this conditional just on GCC, except for ia64
 247    register window-flushing.  */
 248 /* Don't use #cpu here since in newest development versions of GCC,
 249    we must call cpp with -traditional, and that disables #cpu.  */
 250
 251 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 252     || defined __alpha__ || defined __mips__ || defined __s390__ \
 253     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 254     || defined __ia64__
 255 #define GC_SETJMP_WORKS 1
 256 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 257 #ifdef __mc68000__
 258 #define GC_LISP_OBJECT_ALIGNMENT 2
 259 #endif
 260 #ifdef __ia64__
 261 #define GC_MARK_SECONDARY_STACK()                               \
 262   do {                                                          \
 263     extern void *__libc_ia64_register_backing_store_base;       \
 264     __builtin_ia64_flushrs ();                                  \
 265     mark_memory (__libc_ia64_register_backing_store_base,       \
 266                  __builtin_ia64_bsp (), 0);                     \
 267   } while (0)
 268 #endif
 269 #endif
 270
 271 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 272    (do not change this comment) */