src/conf_post.h

   1 /* conf_post.h --- configure.ac includes this via AH_BOTTOM
   2
   3 Copyright (C) 1988, 1993-1994, 1999-2002, 2004-2013 Free Software
   4 Foundation, Inc.
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software: you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation, either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* Commentary:
  22
  23    Rather than writing this code directly in AH_BOTTOM, we include it
  24    via this file.  This is so that it does not get processed by
  25    autoheader.  Eg, any undefs here would otherwise be commented out.
  26 */
  27
  28 /* Code: */
  29
  30 /* Include any platform specific configuration file.  */
  31 #ifdef config_opsysfile
  32 # include config_opsysfile
  33 #endif
  34
  35 #ifndef WINDOWSNT
  36 /* On AIX 3 this must be included before any other include file.  */
  37 #include <alloca.h>
  38 #if ! HAVE_ALLOCA
  39 # error "alloca not available on this machine"
  40 #endif
  41 #endif
  42
  43 #ifndef __has_attribute
  44 # define __has_attribute(a) 0 /* non-clang */
  45 #endif
  46
  47 #ifdef DARWIN_OS
  48 #ifdef emacs
  49 #define malloc unexec_malloc
  50 #define realloc unexec_realloc
  51 #define free unexec_free
  52 #endif
  53 /* The following solves the problem that Emacs hangs when evaluating
  54    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
  55    does not exist.  Also, setsid is not allowed in the vfork child's
  56    context as of Darwin 9/Mac OS X 10.5.  */
  57 #undef HAVE_WORKING_VFORK
  58 #define vfork fork
  59 #endif  /* DARWIN_OS */
  60
  61 /* We have to go this route, rather than the old hpux9 approach of
  62    renaming the functions via macros.  The system's stdlib.h has fully
  63    prototyped declarations, which yields a conflicting definition of
  64    srand48; it tries to redeclare what was once srandom to be srand48.
  65    So we go with HAVE_LRAND48 being defined.  */
  66 #ifdef HPUX
  67 #undef srandom
  68 #undef random
  69 /* We try to avoid checking for random and rint on hpux in
  70    configure.ac, but some other configure test might check for them as
  71    a dependency, so to be safe we also undefine them here.
  72  */
  73 #undef HAVE_RANDOM
  74 #undef HAVE_RINT
  75 #endif  /* HPUX */
  76
  77 #ifdef IRIX6_5
  78 #ifdef emacs
  79 char *_getpty();
  80 #endif
  81
  82 #endif /* IRIX6_5 */
  83
  84 #ifdef MSDOS
  85 #ifndef __DJGPP__
  86 You lose; /* Emacs for DOS must be compiled with DJGPP */
  87 #endif
  88 #define _NAIVE_DOS_REGS
  89
  90 /* Start of gnulib-related stuff  */
  91
  92 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
  93    2.03 has it, but it also has _strtold as a stub that jumps to
  94    strtold, so use _strtold in all versions.  */
  95 #define strtold _strtold
  96
  97 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
  98 # define HAVE_LSTAT 1
  99 #else
 100 # define lstat stat
 101 #endif
 102 /* The "portable" definition of _GL_INLINE on config.h does not work
 103    with DJGPP GCC 3.4.4: it causes unresolved externals in sysdep.c,
 104    although lib/execinfo.h is included and the inline functions there
 105    are visible.  */
 106 #if __GNUC__ < 4
 107 # define _GL_EXECINFO_INLINE inline
 108 #endif
 109 /* End of gnulib-related stuff.  */
 110
 111 #define emacs_raise(sig) msdos_fatal_signal (sig)
 112
 113 /* Define one of these for easier conditionals.  */
 114 #ifdef HAVE_X_WINDOWS
 115 /* We need a little extra space, see ../../lisp/loadup.el and the
 116    commentary below, in the non-X branch.  The 140KB number was
 117    measured on GNU/Linux and on MS-Windows.  */
 118 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 119 #else
 120 /* We need a little extra space, see ../../lisp/loadup.el.
 121    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 122    overall, we end up wasting 130KB of pure space, because
 123    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 124    non-DOS specific files and load history; the latter is about 55K,
 125    but depends on the depth of the top-level Emacs directory in the
 126    directory tree).  Given the unknown policy of different DPMI
 127    hosts regarding loading of untouched pages, I'm not going to risk
 128    enlarging Emacs footprint by another 100+ KBytes.  */
 129 #define SYSTEM_PURESIZE_EXTRA (-170000+65000)
 130 #endif
 131 #endif  /* MSDOS */
 132
 133 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 134    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 135 #ifdef HAVE_NS
 136 #if defined NS_IMPL_GNUSTEP
 137 #  define SYSTEM_PURESIZE_EXTRA 30000
 138 #elif defined DARWIN_OS
 139 #  define SYSTEM_PURESIZE_EXTRA 200000
 140 #endif
 141 #endif
 142
 143 #if defined HAVE_NTGUI && !defined DebPrint
 144 # ifdef EMACSDEBUG
 145 extern void _DebPrint (const char *fmt, ...);
 146 #  define DebPrint(stuff) _DebPrint stuff
 147 # else
 148 #  define DebPrint(stuff)
 149 # endif
 150 #endif
 151
 152 #if defined CYGWIN && defined HAVE_NTGUI
 153 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 154 # define _WIN32_WINNT 0x500 /* Win2k */
 155 #endif
 156
 157 #ifdef emacs /* Don't do this for lib-src.  */
 158 /* Tell regex.c to use a type compatible with Emacs.  */
 159 #define RE_TRANSLATE_TYPE Lisp_Object
 160 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 161 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 162 #endif
 163
 164 #include <string.h>
 165 #include <stdlib.h>
 166
 167 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 168 #define NO_INLINE __attribute__((noinline))
 169 #else
 170 #define NO_INLINE
 171 #endif
 172
 173 #if (__clang__                                                          \
 174      ? __has_attribute (externally_visible)                             \
 175      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 176 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 177 #else
 178 #define EXTERNALLY_VISIBLE
 179 #endif
 180
 181 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 182 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 183 #else
 184 # define ATTRIBUTE_FORMAT(spec) /* empty */
 185 #endif
 186
 187 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 188 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 189    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 190 #else
 191 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 192    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 193 #endif
 194
 195 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 196
 197 /* Some versions of GNU/Linux define noinline in their headers.  */
 198 #ifdef noinline
 199 #undef noinline
 200 #endif
 201
 202 /* Use Gnulib's extern-inline module for extern inline functions.
 203    An include file foo.h should prepend FOO_INLINE to function
 204    definitions, with the following overall pattern:
 205
 206       [#include any other .h files first.]
 207       ...
 208       INLINE_HEADER_BEGIN
 209       ...
 210       INLINE int
 211       incr (int i)
 212       {
 213         return i + 1;
 214       }
 215       ...
 216       INLINE_HEADER_END
 217
 218    For every executable, exactly one file that includes the header
 219    should do this:
 220
 221       #define INLINE EXTERN_INLINE
 222
 223    before including config.h or any other .h file.
 224    Other .c files should not define INLINE.
 225
 226    C99 compilers compile functions like 'incr' as C99-style extern
 227    inline functions.  Pre-C99 GCCs do something similar with
 228    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 229    functions, which bloats the code but is good enough.  */
 230
 231 #ifndef INLINE
 232 # define INLINE _GL_INLINE
 233 #endif
 234 #define EXTERN_INLINE _GL_EXTERN_INLINE
 235 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 236 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 237
 238 /* To use the struct hack with N elements, declare the struct like this:
 239      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 240    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.  */
 241 #if 199901 <= __STDC_VERSION__
 242 # define FLEXIBLE_ARRAY_MEMBER
 243 #elif __GNUC__ && !defined __STRICT_ANSI__
 244 # define FLEXIBLE_ARRAY_MEMBER 0
 245 #else
 246 # define FLEXIBLE_ARRAY_MEMBER 1
 247 #endif
 248
 249 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 250 #ifdef lint
 251 /* Use CODE only if lint checking is in effect.  */
 252 # define IF_LINT(Code) Code
 253 #else
 254 # define IF_LINT(Code) /* empty */
 255 #endif
 256
 257 /* conf_post.h ends here */