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