src/conf_post.h

   1 /* conf_post.h --- configure.ac includes this via AH_BOTTOM
   2
   3 Copyright (C) 1988, 1993-1994, 1999-2002, 2004-2014 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 /* When not using Clang, assume its attributes and features are absent.  */
  54 #ifndef __has_attribute
  55 # define __has_attribute(a) false
  56 #endif
  57 #ifndef __has_feature
  58 # define __has_feature(a) false
  59 #endif
  60
  61 /* True if addresses are being sanitized.  */
  62 #if defined __SANITIZE_ADDRESS__ || __has_feature (address_sanitizer)
  63 # define ADDRESS_SANITIZER true
  64 #else
  65 # define ADDRESS_SANITIZER false
  66 #endif
  67
  68 #ifdef DARWIN_OS
  69 #ifdef emacs
  70 #define malloc unexec_malloc
  71 #define realloc unexec_realloc
  72 #define free unexec_free
  73 #endif
  74 /* The following solves the problem that Emacs hangs when evaluating
  75    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
  76    does not exist.  Also, setsid is not allowed in the vfork child's
  77    context as of Darwin 9/Mac OS X 10.5.  */
  78 #undef HAVE_WORKING_VFORK
  79 #define vfork fork
  80 #endif  /* DARWIN_OS */
  81
  82 /* We have to go this route, rather than the old hpux9 approach of
  83    renaming the functions via macros.  The system's stdlib.h has fully
  84    prototyped declarations, which yields a conflicting definition of
  85    srand48; it tries to redeclare what was once srandom to be srand48.
  86    So we go with HAVE_LRAND48 being defined.  */
  87 #ifdef HPUX
  88 #undef srandom
  89 #undef random
  90 /* We try to avoid checking for random and rint on hpux in
  91    configure.ac, but some other configure test might check for them as
  92    a dependency, so to be safe we also undefine them here.
  93  */
  94 #undef HAVE_RANDOM
  95 #undef HAVE_RINT
  96 #endif  /* HPUX */
  97
  98 #ifdef IRIX6_5
  99 #ifdef emacs
 100 char *_getpty();
 101 #endif
 102 #define INET6 /* Needed for struct sockaddr_in6.  */
 103 #undef HAVE_GETADDRINFO /* IRIX has getaddrinfo but not struct addrinfo.  */
 104 #endif /* IRIX6_5 */
 105
 106 #ifdef MSDOS
 107 #ifndef __DJGPP__
 108 You lose; /* Emacs for DOS must be compiled with DJGPP */
 109 #endif
 110 #define _NAIVE_DOS_REGS
 111
 112 /* Start of gnulib-related stuff  */
 113
 114 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 115    2.03 has it, but it also has _strtold as a stub that jumps to
 116    strtold, so use _strtold in all versions.  */
 117 #define strtold _strtold
 118
 119 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 120 # define HAVE_LSTAT 1
 121 #else
 122 # define lstat stat
 123 #endif
 124 /* The "portable" definition of _GL_INLINE on config.h does not work
 125    with DJGPP GCC 3.4.4: it causes unresolved externals in sysdep.c,
 126    although lib/execinfo.h is included and the inline functions there
 127    are visible.  */
 128 #if __GNUC__ < 4
 129 # define _GL_EXECINFO_INLINE inline
 130 #endif
 131 /* End of gnulib-related stuff.  */
 132
 133 #define emacs_raise(sig) msdos_fatal_signal (sig)
 134
 135 /* Define one of these for easier conditionals.  */
 136 #ifdef HAVE_X_WINDOWS
 137 /* We need a little extra space, see ../../lisp/loadup.el and the
 138    commentary below, in the non-X branch.  The 140KB number was
 139    measured on GNU/Linux and on MS-Windows.  */
 140 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 141 #else
 142 /* We need a little extra space, see ../../lisp/loadup.el.
 143    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 144    overall, we end up wasting 130KB of pure space, because
 145    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 146    non-DOS specific files and load history; the latter is about 55K,
 147    but depends on the depth of the top-level Emacs directory in the
 148    directory tree).  Given the unknown policy of different DPMI
 149    hosts regarding loading of untouched pages, I'm not going to risk
 150    enlarging Emacs footprint by another 100+ KBytes.  */
 151 #define SYSTEM_PURESIZE_EXTRA (-170000+65000)
 152 #endif
 153 #endif  /* MSDOS */
 154
 155 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 156    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 157 #ifdef HAVE_NS
 158 #if defined NS_IMPL_GNUSTEP
 159 #  define SYSTEM_PURESIZE_EXTRA 30000
 160 #elif defined DARWIN_OS
 161 #  define SYSTEM_PURESIZE_EXTRA 200000
 162 #endif
 163 #endif
 164
 165 #ifdef CYGWIN
 166 #define SYSTEM_PURESIZE_EXTRA 10000
 167 #endif
 168
 169 #if defined HAVE_NTGUI && !defined DebPrint
 170 # ifdef EMACSDEBUG
 171 extern void _DebPrint (const char *fmt, ...);
 172 #  define DebPrint(stuff) _DebPrint stuff
 173 # else
 174 #  define DebPrint(stuff)
 175 # endif
 176 #endif
 177
 178 #if defined CYGWIN && defined HAVE_NTGUI
 179 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 180 # define _WIN32_WINNT 0x500 /* Win2k */
 181 #endif
 182
 183 #ifdef emacs /* Don't do this for lib-src.  */
 184 /* Tell regex.c to use a type compatible with Emacs.  */
 185 #define RE_TRANSLATE_TYPE Lisp_Object
 186 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 187 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 188 #endif
 189
 190 #include <string.h>
 191 #include <stdlib.h>
 192
 193 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 194 #define NO_INLINE __attribute__((noinline))
 195 #else
 196 #define NO_INLINE
 197 #endif
 198
 199 #if (__clang__                                                          \
 200      ? __has_attribute (externally_visible)                             \
 201      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 202 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 203 #else
 204 #define EXTERNALLY_VISIBLE
 205 #endif
 206
 207 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 208 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 209 #else
 210 # define ATTRIBUTE_FORMAT(spec) /* empty */
 211 #endif
 212
 213 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 214 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 215    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 216 #else
 217 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 218    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 219 #endif
 220
 221 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 222
 223 /* Work around GCC bug 59600: when a function is inlined, the inlined
 224    code may have its addresses sanitized even if the function has the
 225    no_sanitize_address attribute.  This bug is present in GCC 4.8.2
 226    and clang 3.3, the latest releases as of December 2013, and the
 227    only platforms known to support address sanitization.  When the bug
 228    is fixed the #if can be updated accordingly.  */
 229 #if ADDRESS_SANITIZER
 230 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 231 #else
 232 # define ADDRESS_SANITIZER_WORKAROUND
 233 #endif
 234
 235 /* Attribute of functions whose code should not have addresses
 236    sanitized.  */
 237
 238 #if (__has_attribute (no_sanitize_address) \
 239      || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
 240 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 241     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 242 #elif __has_attribute (no_address_safety_analysis)
 243 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 244     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 245 #else
 246 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 247 #endif
 248
 249 /* Some versions of GNU/Linux define noinline in their headers.  */
 250 #ifdef noinline
 251 #undef noinline
 252 #endif
 253
 254 /* Use Gnulib's extern-inline module for extern inline functions.
 255    An include file foo.h should prepend FOO_INLINE to function
 256    definitions, with the following overall pattern:
 257
 258       [#include any other .h files first.]
 259       ...
 260       INLINE_HEADER_BEGIN
 261       ...
 262       INLINE int
 263       incr (int i)
 264       {
 265         return i + 1;
 266       }
 267       ...
 268       INLINE_HEADER_END
 269
 270    For every executable, exactly one file that includes the header
 271    should do this:
 272
 273       #define INLINE EXTERN_INLINE
 274
 275    before including config.h or any other .h file.
 276    Other .c files should not define INLINE.
 277
 278    C99 compilers compile functions like 'incr' as C99-style extern
 279    inline functions.  Pre-C99 GCCs do something similar with
 280    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 281    functions, which bloats the code but is good enough.  */
 282
 283 #ifndef INLINE
 284 # define INLINE _GL_INLINE
 285 #endif
 286 #define EXTERN_INLINE _GL_EXTERN_INLINE
 287 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 288 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 289
 290 /* To use the struct hack with N elements, declare the struct like this:
 291      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 292    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.  */
 293 #if 199901 <= __STDC_VERSION__
 294 # define FLEXIBLE_ARRAY_MEMBER
 295 #elif __GNUC__ && !defined __STRICT_ANSI__
 296 # define FLEXIBLE_ARRAY_MEMBER 0
 297 #else
 298 # define FLEXIBLE_ARRAY_MEMBER 1
 299 #endif
 300
 301 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 302 #ifdef lint
 303 /* Use CODE only if lint checking is in effect.  */
 304 # define IF_LINT(Code) Code
 305 #else
 306 # define IF_LINT(Code) /* empty */
 307 #endif
 308
 309 /* conf_post.h ends here */