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    Nor does compiling Objective-C with standard GCC.  */
  39 #if __STDC_VERSION__ < 199901 || NS_IMPL_GNUSTEP
  40 typedef unsigned int bool_bf;
  41 #else
  42 typedef bool bool_bf;
  43 #endif
  44
  45 #ifndef WINDOWSNT
  46 /* On AIX 3 this must be included before any other include file.  */
  47 #include <alloca.h>
  48 #if ! HAVE_ALLOCA
  49 # error "alloca not available on this machine"
  50 #endif
  51 #endif
  52
  53 #ifndef __has_attribute
  54 # define __has_attribute(a) false /* non-clang */
  55 #endif
  56
  57 #ifdef DARWIN_OS
  58 #ifdef emacs
  59 #define malloc unexec_malloc
  60 #define realloc unexec_realloc
  61 #define free unexec_free
  62 #endif
  63 /* The following solves the problem that Emacs hangs when evaluating
  64    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
  65    does not exist.  Also, setsid is not allowed in the vfork child's
  66    context as of Darwin 9/Mac OS X 10.5.  */
  67 #undef HAVE_WORKING_VFORK
  68 #define vfork fork
  69 #endif  /* DARWIN_OS */
  70
  71 /* We have to go this route, rather than the old hpux9 approach of
  72    renaming the functions via macros.  The system's stdlib.h has fully
  73    prototyped declarations, which yields a conflicting definition of
  74    srand48; it tries to redeclare what was once srandom to be srand48.
  75    So we go with HAVE_LRAND48 being defined.  */
  76 #ifdef HPUX
  77 #undef srandom
  78 #undef random
  79 /* We try to avoid checking for random and rint on hpux in
  80    configure.ac, but some other configure test might check for them as
  81    a dependency, so to be safe we also undefine them here.
  82  */
  83 #undef HAVE_RANDOM
  84 #undef HAVE_RINT
  85 #endif  /* HPUX */
  86
  87 #ifdef IRIX6_5
  88 #ifdef emacs
  89 char *_getpty();
  90 #endif
  91
  92 #endif /* IRIX6_5 */
  93
  94 #ifdef MSDOS
  95 #ifndef __DJGPP__
  96 You lose; /* Emacs for DOS must be compiled with DJGPP */
  97 #endif
  98 #define _NAIVE_DOS_REGS
  99
 100 /* Start of gnulib-related stuff  */
 101
 102 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 103    2.03 has it, but it also has _strtold as a stub that jumps to
 104    strtold, so use _strtold in all versions.  */
 105 #define strtold _strtold
 106
 107 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 108 # define HAVE_LSTAT 1
 109 #else
 110 # define lstat stat
 111 #endif
 112 /* The "portable" definition of _GL_INLINE on config.h does not work
 113    with DJGPP GCC 3.4.4: it causes unresolved externals in sysdep.c,
 114    although lib/execinfo.h is included and the inline functions there
 115    are visible.  */
 116 #if __GNUC__ < 4
 117 # define _GL_EXECINFO_INLINE inline
 118 #endif
 119 /* End of gnulib-related stuff.  */
 120
 121 #define emacs_raise(sig) msdos_fatal_signal (sig)
 122
 123 /* Define one of these for easier conditionals.  */
 124 #ifdef HAVE_X_WINDOWS
 125 /* We need a little extra space, see ../../lisp/loadup.el and the
 126    commentary below, in the non-X branch.  The 140KB number was
 127    measured on GNU/Linux and on MS-Windows.  */
 128 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 129 #else
 130 /* We need a little extra space, see ../../lisp/loadup.el.
 131    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 132    overall, we end up wasting 130KB of pure space, because
 133    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 134    non-DOS specific files and load history; the latter is about 55K,
 135    but depends on the depth of the top-level Emacs directory in the
 136    directory tree).  Given the unknown policy of different DPMI
 137    hosts regarding loading of untouched pages, I'm not going to risk
 138    enlarging Emacs footprint by another 100+ KBytes.  */
 139 #define SYSTEM_PURESIZE_EXTRA (-170000+65000)
 140 #endif
 141 #endif  /* MSDOS */
 142
 143 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 144    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 145 #ifdef HAVE_NS
 146 #if defined NS_IMPL_GNUSTEP
 147 #  define SYSTEM_PURESIZE_EXTRA 30000
 148 #elif defined DARWIN_OS
 149 #  define SYSTEM_PURESIZE_EXTRA 200000
 150 #endif
 151 #endif
 152
 153 #if defined HAVE_NTGUI && !defined DebPrint
 154 # ifdef EMACSDEBUG
 155 extern void _DebPrint (const char *fmt, ...);
 156 #  define DebPrint(stuff) _DebPrint stuff
 157 # else
 158 #  define DebPrint(stuff)
 159 # endif
 160 #endif
 161
 162 #if defined CYGWIN && defined HAVE_NTGUI
 163 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 164 # define _WIN32_WINNT 0x500 /* Win2k */
 165 #endif
 166
 167 #ifdef emacs /* Don't do this for lib-src.  */
 168 /* Tell regex.c to use a type compatible with Emacs.  */
 169 #define RE_TRANSLATE_TYPE Lisp_Object
 170 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 171 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 172 #endif
 173
 174 #include <string.h>
 175 #include <stdlib.h>
 176
 177 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 178 #define NO_INLINE __attribute__((noinline))
 179 #else
 180 #define NO_INLINE
 181 #endif
 182
 183 #if (__clang__                                                          \
 184      ? __has_attribute (externally_visible)                             \
 185      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 186 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 187 #else
 188 #define EXTERNALLY_VISIBLE
 189 #endif
 190
 191 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 192 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 193 #else
 194 # define ATTRIBUTE_FORMAT(spec) /* empty */
 195 #endif
 196
 197 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 198 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 199    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 200 #else
 201 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 202    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 203 #endif
 204
 205 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 206
 207 /* Some versions of GNU/Linux define noinline in their headers.  */
 208 #ifdef noinline
 209 #undef noinline
 210 #endif
 211
 212 /* Use Gnulib's extern-inline module for extern inline functions.
 213    An include file foo.h should prepend FOO_INLINE to function
 214    definitions, with the following overall pattern:
 215
 216       [#include any other .h files first.]
 217       ...
 218       INLINE_HEADER_BEGIN
 219       ...
 220       INLINE int
 221       incr (int i)
 222       {
 223         return i + 1;
 224       }
 225       ...
 226       INLINE_HEADER_END
 227
 228    For every executable, exactly one file that includes the header
 229    should do this:
 230
 231       #define INLINE EXTERN_INLINE
 232
 233    before including config.h or any other .h file.
 234    Other .c files should not define INLINE.
 235
 236    C99 compilers compile functions like 'incr' as C99-style extern
 237    inline functions.  Pre-C99 GCCs do something similar with
 238    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 239    functions, which bloats the code but is good enough.  */
 240
 241 #ifndef INLINE
 242 # define INLINE _GL_INLINE
 243 #endif
 244 #define EXTERN_INLINE _GL_EXTERN_INLINE
 245 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 246 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 247
 248 /* To use the struct hack with N elements, declare the struct like this:
 249      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 250    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.  */
 251 #if 199901 <= __STDC_VERSION__
 252 # define FLEXIBLE_ARRAY_MEMBER
 253 #elif __GNUC__ && !defined __STRICT_ANSI__
 254 # define FLEXIBLE_ARRAY_MEMBER 0
 255 #else
 256 # define FLEXIBLE_ARRAY_MEMBER 1
 257 #endif
 258
 259 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 260 #ifdef lint
 261 /* Use CODE only if lint checking is in effect.  */
 262 # define IF_LINT(Code) Code
 263 #else
 264 # define IF_LINT(Code) /* empty */
 265 #endif
 266
 267 /* conf_post.h ends here */