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 #include <stdbool.h>
  36
  37 /* The pre-C99 <stdbool.h> emulation doesn't work for bool bitfields.  */
  38 #if __STDC_VERSION__ < 199901
  39 typedef unsigned int bool_bf;
  40 #else
  41 typedef bool bool_bf;
  42 #endif
  43
  44 #ifndef WINDOWSNT
  45 /* On AIX 3 this must be included before any other include file.  */
  46 #include <alloca.h>
  47 #if ! HAVE_ALLOCA
  48 # error "alloca not available on this machine"
  49 #endif
  50 #endif
  51
  52 #ifndef __has_attribute
  53 # define __has_attribute(a) false /* non-clang */
  54 #endif
  55
  56 #ifdef DARWIN_OS
  57 #ifdef emacs
  58 #define malloc unexec_malloc
  59 #define realloc unexec_realloc
  60 #define free unexec_free
  61 #endif
  62 /* The following solves the problem that Emacs hangs when evaluating
  63    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
  64    does not exist.  Also, setsid is not allowed in the vfork child's
  65    context as of Darwin 9/Mac OS X 10.5.  */
  66 #undef HAVE_WORKING_VFORK
  67 #define vfork fork
  68 #endif  /* DARWIN_OS */
  69
  70 /* We have to go this route, rather than the old hpux9 approach of
  71    renaming the functions via macros.  The system's stdlib.h has fully
  72    prototyped declarations, which yields a conflicting definition of
  73    srand48; it tries to redeclare what was once srandom to be srand48.
  74    So we go with HAVE_LRAND48 being defined.  */
  75 #ifdef HPUX
  76 #undef srandom
  77 #undef random
  78 /* We try to avoid checking for random and rint on hpux in
  79    configure.ac, but some other configure test might check for them as
  80    a dependency, so to be safe we also undefine them here.
  81  */
  82 #undef HAVE_RANDOM
  83 #undef HAVE_RINT
  84 #endif  /* HPUX */
  85
  86 #ifdef IRIX6_5
  87 #ifdef emacs
  88 char *_getpty();
  89 #endif
  90
  91 #endif /* IRIX6_5 */
  92
  93 #ifdef MSDOS
  94 #ifndef __DJGPP__
  95 You lose; /* Emacs for DOS must be compiled with DJGPP */
  96 #endif
  97 #define _NAIVE_DOS_REGS
  98
  99 /* Start of gnulib-related stuff  */
 100
 101 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 102    2.03 has it, but it also has _strtold as a stub that jumps to
 103    strtold, so use _strtold in all versions.  */
 104 #define strtold _strtold
 105
 106 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 107 # define HAVE_LSTAT 1
 108 #else
 109 # define lstat stat
 110 #endif
 111 /* The "portable" definition of _GL_INLINE on config.h does not work
 112    with DJGPP GCC 3.4.4: it causes unresolved externals in sysdep.c,
 113    although lib/execinfo.h is included and the inline functions there
 114    are visible.  */
 115 #if __GNUC__ < 4
 116 # define _GL_EXECINFO_INLINE inline
 117 #endif
 118 /* End of gnulib-related stuff.  */
 119
 120 #define emacs_raise(sig) msdos_fatal_signal (sig)
 121
 122 /* Define one of these for easier conditionals.  */
 123 #ifdef HAVE_X_WINDOWS
 124 /* We need a little extra space, see ../../lisp/loadup.el and the
 125    commentary below, in the non-X branch.  The 140KB number was
 126    measured on GNU/Linux and on MS-Windows.  */
 127 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 128 #else
 129 /* We need a little extra space, see ../../lisp/loadup.el.
 130    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 131    overall, we end up wasting 130KB of pure space, because
 132    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 133    non-DOS specific files and load history; the latter is about 55K,
 134    but depends on the depth of the top-level Emacs directory in the
 135    directory tree).  Given the unknown policy of different DPMI
 136    hosts regarding loading of untouched pages, I'm not going to risk
 137    enlarging Emacs footprint by another 100+ KBytes.  */
 138 #define SYSTEM_PURESIZE_EXTRA (-170000+65000)
 139 #endif
 140 #endif  /* MSDOS */
 141
 142 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 143    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 144 #ifdef HAVE_NS
 145 #if defined NS_IMPL_GNUSTEP
 146 #  define SYSTEM_PURESIZE_EXTRA 30000
 147 #elif defined DARWIN_OS
 148 #  define SYSTEM_PURESIZE_EXTRA 200000
 149 #endif
 150 #endif
 151
 152 #if defined HAVE_NTGUI && !defined DebPrint
 153 # ifdef EMACSDEBUG
 154 extern void _DebPrint (const char *fmt, ...);
 155 #  define DebPrint(stuff) _DebPrint stuff
 156 # else
 157 #  define DebPrint(stuff)
 158 # endif
 159 #endif
 160
 161 #if defined CYGWIN && defined HAVE_NTGUI
 162 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 163 # define _WIN32_WINNT 0x500 /* Win2k */
 164 #endif
 165
 166 #ifdef emacs /* Don't do this for lib-src.  */
 167 /* Tell regex.c to use a type compatible with Emacs.  */
 168 #define RE_TRANSLATE_TYPE Lisp_Object
 169 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 170 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 171 #endif
 172
 173 #include <string.h>
 174 #include <stdlib.h>
 175
 176 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 177 #define NO_INLINE __attribute__((noinline))
 178 #else
 179 #define NO_INLINE
 180 #endif
 181
 182 #if (__clang__                                                          \
 183      ? __has_attribute (externally_visible)                             \
 184      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 185 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 186 #else
 187 #define EXTERNALLY_VISIBLE
 188 #endif
 189
 190 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 191 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 192 #else
 193 # define ATTRIBUTE_FORMAT(spec) /* empty */
 194 #endif
 195
 196 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 197 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 198    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 199 #else
 200 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 201    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 202 #endif
 203
 204 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 205
 206 /* Some versions of GNU/Linux define noinline in their headers.  */
 207 #ifdef noinline
 208 #undef noinline
 209 #endif
 210
 211 /* Use Gnulib's extern-inline module for extern inline functions.
 212    An include file foo.h should prepend FOO_INLINE to function
 213    definitions, with the following overall pattern:
 214
 215       [#include any other .h files first.]
 216       ...
 217       INLINE_HEADER_BEGIN
 218       ...
 219       INLINE int
 220       incr (int i)
 221       {
 222         return i + 1;
 223       }
 224       ...
 225       INLINE_HEADER_END
 226
 227    For every executable, exactly one file that includes the header
 228    should do this:
 229
 230       #define INLINE EXTERN_INLINE
 231
 232    before including config.h or any other .h file.
 233    Other .c files should not define INLINE.
 234
 235    C99 compilers compile functions like 'incr' as C99-style extern
 236    inline functions.  Pre-C99 GCCs do something similar with
 237    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 238    functions, which bloats the code but is good enough.  */
 239
 240 #ifndef INLINE
 241 # define INLINE _GL_INLINE
 242 #endif
 243 #define EXTERN_INLINE _GL_EXTERN_INLINE
 244 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 245 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 246
 247 /* To use the struct hack with N elements, declare the struct like this:
 248      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 249    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.  */
 250 #if 199901 <= __STDC_VERSION__
 251 # define FLEXIBLE_ARRAY_MEMBER
 252 #elif __GNUC__ && !defined __STRICT_ANSI__
 253 # define FLEXIBLE_ARRAY_MEMBER 0
 254 #else
 255 # define FLEXIBLE_ARRAY_MEMBER 1
 256 #endif
 257
 258 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 259 #ifdef lint
 260 /* Use CODE only if lint checking is in effect.  */
 261 # define IF_LINT(Code) Code
 262 #else
 263 # define IF_LINT(Code) /* empty */
 264 #endif
 265
 266 /* conf_post.h ends here */