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 type of bool bitfields.  Needed to compile Objective-C with
  38    standard GCC.  It was also needed to port to pre-C99 compilers,
  39    although we don't care about that any more.  */
  40 #if NS_IMPL_GNUSTEP
  41 typedef unsigned int bool_bf;
  42 #else
  43 typedef bool bool_bf;
  44 #endif
  45
  46 #ifndef WINDOWSNT
  47 /* On AIX 3 this must be included before any other include file.  */
  48 #include <alloca.h>
  49 #if ! HAVE_ALLOCA
  50 # error "alloca not available on this machine"
  51 #endif
  52 #endif
  53
  54 /* When not using Clang, assume its attributes and features are absent.  */
  55 #ifndef __has_attribute
  56 # define __has_attribute(a) false
  57 #endif
  58 #ifndef __has_feature
  59 # define __has_feature(a) false
  60 #endif
  61
  62 /* True if addresses are being sanitized.  */
  63 #if defined __SANITIZE_ADDRESS__ || __has_feature (address_sanitizer)
  64 # define ADDRESS_SANITIZER true
  65 #else
  66 # define ADDRESS_SANITIZER false
  67 #endif
  68
  69 #ifdef DARWIN_OS
  70 #ifdef emacs
  71 #define malloc unexec_malloc
  72 #define realloc unexec_realloc
  73 #define free unexec_free
  74 #endif
  75 /* The following solves the problem that Emacs hangs when evaluating
  76    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
  77    does not exist.  Also, setsid is not allowed in the vfork child's
  78    context as of Darwin 9/Mac OS X 10.5.  */
  79 #undef HAVE_WORKING_VFORK
  80 #define vfork fork
  81 #endif  /* DARWIN_OS */
  82
  83 /* We have to go this route, rather than the old hpux9 approach of
  84    renaming the functions via macros.  The system's stdlib.h has fully
  85    prototyped declarations, which yields a conflicting definition of
  86    srand48; it tries to redeclare what was once srandom to be srand48.
  87    So we go with HAVE_LRAND48 being defined.  */
  88 #ifdef HPUX
  89 #undef srandom
  90 #undef random
  91 #undef HAVE_RANDOM
  92 #undef HAVE_RINT
  93 #endif  /* HPUX */
  94
  95 #ifdef IRIX6_5
  96 #ifdef emacs
  97 char *_getpty();
  98 #endif
  99 #define INET6 /* Needed for struct sockaddr_in6.  */
 100 #undef HAVE_GETADDRINFO /* IRIX has getaddrinfo but not struct addrinfo.  */
 101 #endif /* IRIX6_5 */
 102
 103 #ifdef MSDOS
 104 #ifndef __DJGPP__
 105 You lose; /* Emacs for DOS must be compiled with DJGPP */
 106 #endif
 107 #define _NAIVE_DOS_REGS
 108
 109 /* Start of gnulib-related stuff  */
 110
 111 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 112    2.03 has it, but it also has _strtold as a stub that jumps to
 113    strtold, so use _strtold in all versions.  */
 114 #define strtold _strtold
 115
 116 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 117 # define HAVE_LSTAT 1
 118 #else
 119 # define lstat stat
 120 #endif
 121
 122 /* We must intercept 'opendir' calls to stash away the directory name,
 123    so we could reuse it in readlinkat; see msdos.c.  */
 124 #define opendir sys_opendir
 125
 126 /* The "portable" definition of _GL_INLINE on config.h does not work
 127    with DJGPP GCC 3.4.4: it causes unresolved externals in sysdep.c,
 128    although lib/execinfo.h is included and the inline functions there
 129    are visible.  */
 130 #if __GNUC__ < 4
 131 # define _GL_EXECINFO_INLINE inline
 132 #endif
 133 /* End of gnulib-related stuff.  */
 134
 135 #define emacs_raise(sig) msdos_fatal_signal (sig)
 136
 137 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 138 #define DATA_START (&etext + 1)
 139
 140 /* Define one of these for easier conditionals.  */
 141 #ifdef HAVE_X_WINDOWS
 142 /* We need a little extra space, see ../../lisp/loadup.el and the
 143    commentary below, in the non-X branch.  The 140KB number was
 144    measured on GNU/Linux and on MS-Windows.  */
 145 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 146 #else
 147 /* We need a little extra space, see ../../lisp/loadup.el.
 148    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 149    overall, we end up wasting 130KB of pure space, because
 150    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 151    non-DOS specific files and load history; the latter is about 55K,
 152    but depends on the depth of the top-level Emacs directory in the
 153    directory tree).  Given the unknown policy of different DPMI
 154    hosts regarding loading of untouched pages, I'm not going to risk
 155    enlarging Emacs footprint by another 100+ KBytes.  */
 156 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 157 #endif
 158 #endif  /* MSDOS */
 159
 160 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 161    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 162 #ifdef HAVE_NS
 163 #if defined NS_IMPL_GNUSTEP
 164 #  define SYSTEM_PURESIZE_EXTRA 30000
 165 #elif defined DARWIN_OS
 166 #  define SYSTEM_PURESIZE_EXTRA 200000
 167 #endif
 168 #endif
 169
 170 #ifdef CYGWIN
 171 #define SYSTEM_PURESIZE_EXTRA 10000
 172 #endif
 173
 174 #if defined HAVE_NTGUI && !defined DebPrint
 175 # ifdef EMACSDEBUG
 176 extern void _DebPrint (const char *fmt, ...);
 177 #  define DebPrint(stuff) _DebPrint stuff
 178 # else
 179 #  define DebPrint(stuff)
 180 # endif
 181 #endif
 182
 183 #if defined CYGWIN && defined HAVE_NTGUI
 184 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 185 # define _WIN32_WINNT 0x500 /* Win2k */
 186 #endif
 187
 188 #ifdef emacs /* Don't do this for lib-src.  */
 189 /* Tell regex.c to use a type compatible with Emacs.  */
 190 #define RE_TRANSLATE_TYPE Lisp_Object
 191 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 192 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 193 #endif
 194
 195 #include <string.h>
 196 #include <stdlib.h>
 197
 198 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 199 #define NO_INLINE __attribute__((noinline))
 200 #else
 201 #define NO_INLINE
 202 #endif
 203
 204 #if (__clang__                                                          \
 205      ? __has_attribute (externally_visible)                             \
 206      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 207 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 208 #else
 209 #define EXTERNALLY_VISIBLE
 210 #endif
 211
 212 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 213 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 214 #else
 215 # define ATTRIBUTE_FORMAT(spec) /* empty */
 216 #endif
 217
 218 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 219 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 220    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 221 #else
 222 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 223    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 224 #endif
 225
 226 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 227
 228 #if 3 <= __GNUC__
 229 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 230 #else
 231 # define ATTRIBUTE_MALLOC
 232 #endif
 233
 234 #if 4 < __GNUC__ + (3 <= __GNUC_MINOR__)
 235 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 236 #else
 237 # define ATTRIBUTE_ALLOC_SIZE(args)
 238 #endif
 239
 240 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 241
 242 /* Work around GCC bug 59600: when a function is inlined, the inlined
 243    code may have its addresses sanitized even if the function has the
 244    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 245    clang 3.4.  */
 246 #if (! ADDRESS_SANITIZER \
 247      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 248          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 249 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 250 #else
 251 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 252 #endif
 253
 254 /* Attribute of functions whose code should not have addresses
 255    sanitized.  */
 256
 257 #if (__has_attribute (no_sanitize_address) \
 258      || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
 259 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 260     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 261 #elif __has_attribute (no_address_safety_analysis)
 262 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 263     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 264 #else
 265 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 266 #endif
 267
 268 /* Some versions of GNU/Linux define noinline in their headers.  */
 269 #ifdef noinline
 270 #undef noinline
 271 #endif
 272
 273 /* Use Gnulib's extern-inline module for extern inline functions.
 274    An include file foo.h should prepend FOO_INLINE to function
 275    definitions, with the following overall pattern:
 276
 277       [#include any other .h files first.]
 278       ...
 279       INLINE_HEADER_BEGIN
 280       ...
 281       INLINE int
 282       incr (int i)
 283       {
 284         return i + 1;
 285       }
 286       ...
 287       INLINE_HEADER_END
 288
 289    For every executable, exactly one file that includes the header
 290    should do this:
 291
 292       #define INLINE EXTERN_INLINE
 293
 294    before including config.h or any other .h file.
 295    Other .c files should not define INLINE.
 296
 297    C99 compilers compile functions like 'incr' as C99-style extern
 298    inline functions.  Pre-C99 GCCs do something similar with
 299    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 300    functions, which bloats the code but is good enough.  */
 301
 302 #ifndef INLINE
 303 # define INLINE _GL_INLINE
 304 #endif
 305 #define EXTERN_INLINE _GL_EXTERN_INLINE
 306 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 307 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 308
 309 /* To use the struct hack with N elements, declare the struct like this:
 310      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 311    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 312    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 313 #ifdef __IBMC__
 314 # define FLEXIBLE_ARRAY_MEMBER 1
 315 #else
 316 # define FLEXIBLE_ARRAY_MEMBER
 317 #endif
 318
 319 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 320 #ifdef lint
 321 /* Use CODE only if lint checking is in effect.  */
 322 # define IF_LINT(Code) Code
 323 #else
 324 # define IF_LINT(Code) /* empty */
 325 #endif
 326
 327 /* conf_post.h ends here */