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 #undef HAVE_RANDOM
  91 #undef HAVE_RINT
  92 #endif  /* HPUX */
  93
  94 #ifdef IRIX6_5
  95 #ifdef emacs
  96 char *_getpty();
  97 #endif
  98 #define INET6 /* Needed for struct sockaddr_in6.  */
  99 #undef HAVE_GETADDRINFO /* IRIX has getaddrinfo but not struct addrinfo.  */
 100 #endif /* IRIX6_5 */
 101
 102 #ifdef MSDOS
 103 #ifndef __DJGPP__
 104 You lose; /* Emacs for DOS must be compiled with DJGPP */
 105 #endif
 106 #define _NAIVE_DOS_REGS
 107
 108 /* Start of gnulib-related stuff  */
 109
 110 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 111    2.03 has it, but it also has _strtold as a stub that jumps to
 112    strtold, so use _strtold in all versions.  */
 113 #define strtold _strtold
 114
 115 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 116 # define HAVE_LSTAT 1
 117 #else
 118 # define lstat stat
 119 #endif
 120
 121 /* We must intercept 'opendir' calls to stash away the directory name,
 122    so we could reuse it in realinkat, see msdos.c.  */
 123 #define opendir sys_opendir
 124
 125 /* The "portable" definition of _GL_INLINE on config.h does not work
 126    with DJGPP GCC 3.4.4: it causes unresolved externals in sysdep.c,
 127    although lib/execinfo.h is included and the inline functions there
 128    are visible.  */
 129 #if __GNUC__ < 4
 130 # define _GL_EXECINFO_INLINE inline
 131 #endif
 132 /* End of gnulib-related stuff.  */
 133
 134 #define emacs_raise(sig) msdos_fatal_signal (sig)
 135
 136 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 137 #define DATA_START (&etext + 1)
 138
 139 /* Define one of these for easier conditionals.  */
 140 #ifdef HAVE_X_WINDOWS
 141 /* We need a little extra space, see ../../lisp/loadup.el and the
 142    commentary below, in the non-X branch.  The 140KB number was
 143    measured on GNU/Linux and on MS-Windows.  */
 144 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 145 #else
 146 /* We need a little extra space, see ../../lisp/loadup.el.
 147    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 148    overall, we end up wasting 130KB of pure space, because
 149    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 150    non-DOS specific files and load history; the latter is about 55K,
 151    but depends on the depth of the top-level Emacs directory in the
 152    directory tree).  Given the unknown policy of different DPMI
 153    hosts regarding loading of untouched pages, I'm not going to risk
 154    enlarging Emacs footprint by another 100+ KBytes.  */
 155 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 156 #endif
 157 #endif  /* MSDOS */
 158
 159 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 160    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 161 #ifdef HAVE_NS
 162 #if defined NS_IMPL_GNUSTEP
 163 #  define SYSTEM_PURESIZE_EXTRA 30000
 164 #elif defined DARWIN_OS
 165 #  define SYSTEM_PURESIZE_EXTRA 200000
 166 #endif
 167 #endif
 168
 169 #ifdef CYGWIN
 170 #define SYSTEM_PURESIZE_EXTRA 10000
 171 #endif
 172
 173 #if defined HAVE_NTGUI && !defined DebPrint
 174 # ifdef EMACSDEBUG
 175 extern void _DebPrint (const char *fmt, ...);
 176 #  define DebPrint(stuff) _DebPrint stuff
 177 # else
 178 #  define DebPrint(stuff)
 179 # endif
 180 #endif
 181
 182 #if defined CYGWIN && defined HAVE_NTGUI
 183 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 184 # define _WIN32_WINNT 0x500 /* Win2k */
 185 #endif
 186
 187 #ifdef emacs /* Don't do this for lib-src.  */
 188 /* Tell regex.c to use a type compatible with Emacs.  */
 189 #define RE_TRANSLATE_TYPE Lisp_Object
 190 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 191 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 192 #endif
 193
 194 #include <string.h>
 195 #include <stdlib.h>
 196
 197 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 198 #define NO_INLINE __attribute__((noinline))
 199 #else
 200 #define NO_INLINE
 201 #endif
 202
 203 #if (__clang__                                                          \
 204      ? __has_attribute (externally_visible)                             \
 205      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 206 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 207 #else
 208 #define EXTERNALLY_VISIBLE
 209 #endif
 210
 211 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 212 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 213 #else
 214 # define ATTRIBUTE_FORMAT(spec) /* empty */
 215 #endif
 216
 217 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 218 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 219    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 220 #else
 221 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 222    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 223 #endif
 224
 225 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 226
 227 /* Work around GCC bug 59600: when a function is inlined, the inlined
 228    code may have its addresses sanitized even if the function has the
 229    no_sanitize_address attribute.  This bug is present in GCC 4.8.2
 230    and clang 3.3, the latest releases as of December 2013, and the
 231    only platforms known to support address sanitization.  When the bug
 232    is fixed the #if can be updated accordingly.  */
 233 #if ADDRESS_SANITIZER
 234 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 235 #else
 236 # define ADDRESS_SANITIZER_WORKAROUND
 237 #endif
 238
 239 /* Attribute of functions whose code should not have addresses
 240    sanitized.  */
 241
 242 #if (__has_attribute (no_sanitize_address) \
 243      || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
 244 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 245     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 246 #elif __has_attribute (no_address_safety_analysis)
 247 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 248     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 249 #else
 250 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 251 #endif
 252
 253 /* Some versions of GNU/Linux define noinline in their headers.  */
 254 #ifdef noinline
 255 #undef noinline
 256 #endif
 257
 258 /* Use Gnulib's extern-inline module for extern inline functions.
 259    An include file foo.h should prepend FOO_INLINE to function
 260    definitions, with the following overall pattern:
 261
 262       [#include any other .h files first.]
 263       ...
 264       INLINE_HEADER_BEGIN
 265       ...
 266       INLINE int
 267       incr (int i)
 268       {
 269         return i + 1;
 270       }
 271       ...
 272       INLINE_HEADER_END
 273
 274    For every executable, exactly one file that includes the header
 275    should do this:
 276
 277       #define INLINE EXTERN_INLINE
 278
 279    before including config.h or any other .h file.
 280    Other .c files should not define INLINE.
 281
 282    C99 compilers compile functions like 'incr' as C99-style extern
 283    inline functions.  Pre-C99 GCCs do something similar with
 284    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 285    functions, which bloats the code but is good enough.  */
 286
 287 #ifndef INLINE
 288 # define INLINE _GL_INLINE
 289 #endif
 290 #define EXTERN_INLINE _GL_EXTERN_INLINE
 291 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 292 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 293
 294 /* To use the struct hack with N elements, declare the struct like this:
 295      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 296    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.  */
 297 #if 199901 <= __STDC_VERSION__
 298 # define FLEXIBLE_ARRAY_MEMBER
 299 #elif __GNUC__ && !defined __STRICT_ANSI__
 300 # define FLEXIBLE_ARRAY_MEMBER 0
 301 #else
 302 # define FLEXIBLE_ARRAY_MEMBER 1
 303 #endif
 304
 305 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 306 #ifdef lint
 307 /* Use CODE only if lint checking is in effect.  */
 308 # define IF_LINT(Code) Code
 309 #else
 310 # define IF_LINT(Code) /* empty */
 311 #endif
 312
 313 /* conf_post.h ends here */