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
 125 /* We must intercept 'opendir' calls to stash away the directory name,
 126    so we could reuse it in readlinkat; see msdos.c.  */
 127 #define opendir sys_opendir
 128
 129 /* End of gnulib-related stuff.  */
 130
 131 #define emacs_raise(sig) msdos_fatal_signal (sig)
 132
 133 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 134 #define DATA_START (&etext + 1)
 135
 136 /* Define one of these for easier conditionals.  */
 137 #ifdef HAVE_X_WINDOWS
 138 /* We need a little extra space, see ../../lisp/loadup.el and the
 139    commentary below, in the non-X branch.  The 140KB number was
 140    measured on GNU/Linux and on MS-Windows.  */
 141 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 142 #else
 143 /* We need a little extra space, see ../../lisp/loadup.el.
 144    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 145    overall, we end up wasting 130KB of pure space, because
 146    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 147    non-DOS specific files and load history; the latter is about 55K,
 148    but depends on the depth of the top-level Emacs directory in the
 149    directory tree).  Given the unknown policy of different DPMI
 150    hosts regarding loading of untouched pages, I'm not going to risk
 151    enlarging Emacs footprint by another 100+ KBytes.  */
 152 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 153 #endif
 154 #endif  /* MSDOS */
 155
 156 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 157    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 158 #ifdef HAVE_NS
 159 #if defined NS_IMPL_GNUSTEP
 160 #  define SYSTEM_PURESIZE_EXTRA 30000
 161 #elif defined DARWIN_OS
 162 #  define SYSTEM_PURESIZE_EXTRA 200000
 163 #endif
 164 #endif
 165
 166 #ifdef CYGWIN
 167 #define SYSTEM_PURESIZE_EXTRA 10000
 168 #endif
 169
 170 #if defined HAVE_NTGUI && !defined DebPrint
 171 # ifdef EMACSDEBUG
 172 extern void _DebPrint (const char *fmt, ...);
 173 #  define DebPrint(stuff) _DebPrint stuff
 174 # else
 175 #  define DebPrint(stuff)
 176 # endif
 177 #endif
 178
 179 #if defined CYGWIN && defined HAVE_NTGUI
 180 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 181 # define _WIN32_WINNT 0x500 /* Win2k */
 182 #endif
 183
 184 #ifdef emacs /* Don't do this for lib-src.  */
 185 /* Tell regex.c to use a type compatible with Emacs.  */
 186 #define RE_TRANSLATE_TYPE Lisp_Object
 187 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 188 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 189 #endif
 190
 191 #include <string.h>
 192 #include <stdlib.h>
 193
 194 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 195 #define NO_INLINE __attribute__((noinline))
 196 #else
 197 #define NO_INLINE
 198 #endif
 199
 200 #if (__clang__                                                          \
 201      ? __has_attribute (externally_visible)                             \
 202      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 203 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 204 #else
 205 #define EXTERNALLY_VISIBLE
 206 #endif
 207
 208 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 209 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 210 #else
 211 # define ATTRIBUTE_FORMAT(spec) /* empty */
 212 #endif
 213
 214 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 215 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 216    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 217 #else
 218 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 219    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 220 #endif
 221
 222 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 223
 224 /* Work around GCC bug 59600: when a function is inlined, the inlined
 225    code may have its addresses sanitized even if the function has the
 226    no_sanitize_address attribute.  This bug is present in GCC 4.8.2
 227    and clang 3.3, the latest releases as of December 2013, and the
 228    only platforms known to support address sanitization.  When the bug
 229    is fixed the #if can be updated accordingly.  */
 230 #if ADDRESS_SANITIZER
 231 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 232 #else
 233 # define ADDRESS_SANITIZER_WORKAROUND
 234 #endif
 235
 236 /* Attribute of functions whose code should not have addresses
 237    sanitized.  */
 238
 239 #if (__has_attribute (no_sanitize_address) \
 240      || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
 241 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 242     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 243 #elif __has_attribute (no_address_safety_analysis)
 244 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 245     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 246 #else
 247 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 248 #endif
 249
 250 /* Some versions of GNU/Linux define noinline in their headers.  */
 251 #ifdef noinline
 252 #undef noinline
 253 #endif
 254
 255 /* Use Gnulib's extern-inline module for extern inline functions.
 256    An include file foo.h should prepend FOO_INLINE to function
 257    definitions, with the following overall pattern:
 258
 259       [#include any other .h files first.]
 260       ...
 261       INLINE_HEADER_BEGIN
 262       ...
 263       INLINE int
 264       incr (int i)
 265       {
 266         return i + 1;
 267       }
 268       ...
 269       INLINE_HEADER_END
 270
 271    For every executable, exactly one file that includes the header
 272    should do this:
 273
 274       #define INLINE EXTERN_INLINE
 275
 276    before including config.h or any other .h file.
 277    Other .c files should not define INLINE.
 278
 279    C99 compilers compile functions like 'incr' as C99-style extern
 280    inline functions.  Pre-C99 GCCs do something similar with
 281    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 282    functions, which bloats the code but is good enough.  */
 283
 284 #ifndef INLINE
 285 # define INLINE _GL_INLINE
 286 #endif
 287 #define EXTERN_INLINE _GL_EXTERN_INLINE
 288 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 289 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 290
 291 /* To use the struct hack with N elements, declare the struct like this:
 292      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 293    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 294    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 295 #if 199901 <= __STDC_VERSION__ && !defined __IBMC__
 296 # define FLEXIBLE_ARRAY_MEMBER
 297 #elif __GNUC__ && !defined __STRICT_ANSI__
 298 # define FLEXIBLE_ARRAY_MEMBER 0
 299 #else
 300 # define FLEXIBLE_ARRAY_MEMBER 1
 301 #endif
 302
 303 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 304 #ifdef lint
 305 /* Use CODE only if lint checking is in effect.  */
 306 # define IF_LINT(Code) Code
 307 #else
 308 # define IF_LINT(Code) /* empty */
 309 #endif
 310
 311 /* conf_post.h ends here */