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 /* The "portable" definition of _GL_INLINE on config.h does not work
 130    with DJGPP GCC 3.4.4: it causes unresolved externals in sysdep.c,
 131    although lib/execinfo.h is included and the inline functions there
 132    are visible.  */
 133 #if __GNUC__ < 4
 134 # define _GL_EXECINFO_INLINE inline
 135 #endif
 136 /* End of gnulib-related stuff.  */
 137
 138 #define emacs_raise(sig) msdos_fatal_signal (sig)
 139
 140 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 141 #define DATA_START (&etext + 1)
 142
 143 /* Define one of these for easier conditionals.  */
 144 #ifdef HAVE_X_WINDOWS
 145 /* We need a little extra space, see ../../lisp/loadup.el and the
 146    commentary below, in the non-X branch.  The 140KB number was
 147    measured on GNU/Linux and on MS-Windows.  */
 148 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 149 #else
 150 /* We need a little extra space, see ../../lisp/loadup.el.
 151    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 152    overall, we end up wasting 130KB of pure space, because
 153    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 154    non-DOS specific files and load history; the latter is about 55K,
 155    but depends on the depth of the top-level Emacs directory in the
 156    directory tree).  Given the unknown policy of different DPMI
 157    hosts regarding loading of untouched pages, I'm not going to risk
 158    enlarging Emacs footprint by another 100+ KBytes.  */
 159 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 160 #endif
 161 #endif  /* MSDOS */
 162
 163 /* Mac OS X / GNUstep need a bit more pure memory.  Of the existing knobs,
 164    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 165 #ifdef HAVE_NS
 166 #if defined NS_IMPL_GNUSTEP
 167 #  define SYSTEM_PURESIZE_EXTRA 30000
 168 #elif defined DARWIN_OS
 169 #  define SYSTEM_PURESIZE_EXTRA 200000
 170 #endif
 171 #endif
 172
 173 #ifdef CYGWIN
 174 #define SYSTEM_PURESIZE_EXTRA 10000
 175 #endif
 176
 177 #if defined HAVE_NTGUI && !defined DebPrint
 178 # ifdef EMACSDEBUG
 179 extern void _DebPrint (const char *fmt, ...);
 180 #  define DebPrint(stuff) _DebPrint stuff
 181 # else
 182 #  define DebPrint(stuff)
 183 # endif
 184 #endif
 185
 186 #if defined CYGWIN && defined HAVE_NTGUI
 187 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 188 # define _WIN32_WINNT 0x500 /* Win2k */
 189 #endif
 190
 191 #ifdef emacs /* Don't do this for lib-src.  */
 192 /* Tell regex.c to use a type compatible with Emacs.  */
 193 #define RE_TRANSLATE_TYPE Lisp_Object
 194 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 195 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 196 #endif
 197
 198 #include <string.h>
 199 #include <stdlib.h>
 200
 201 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 202 #define NO_INLINE __attribute__((noinline))
 203 #else
 204 #define NO_INLINE
 205 #endif
 206
 207 #if (__clang__                                                          \
 208      ? __has_attribute (externally_visible)                             \
 209      : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 210 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 211 #else
 212 #define EXTERNALLY_VISIBLE
 213 #endif
 214
 215 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 216 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 217 #else
 218 # define ATTRIBUTE_FORMAT(spec) /* empty */
 219 #endif
 220
 221 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 222 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 223    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 224 #else
 225 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 226    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 227 #endif
 228
 229 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 230
 231 /* Work around GCC bug 59600: when a function is inlined, the inlined
 232    code may have its addresses sanitized even if the function has the
 233    no_sanitize_address attribute.  This bug is present in GCC 4.8.2
 234    and clang 3.3, the latest releases as of December 2013, and the
 235    only platforms known to support address sanitization.  When the bug
 236    is fixed the #if can be updated accordingly.  */
 237 #if ADDRESS_SANITIZER
 238 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 239 #else
 240 # define ADDRESS_SANITIZER_WORKAROUND
 241 #endif
 242
 243 /* Attribute of functions whose code should not have addresses
 244    sanitized.  */
 245
 246 #if (__has_attribute (no_sanitize_address) \
 247      || 4 < __GNUC__ + (8 <= __GNUC_MINOR__))
 248 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 249     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 250 #elif __has_attribute (no_address_safety_analysis)
 251 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 252     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 253 #else
 254 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 255 #endif
 256
 257 /* Some versions of GNU/Linux define noinline in their headers.  */
 258 #ifdef noinline
 259 #undef noinline
 260 #endif
 261
 262 /* Use Gnulib's extern-inline module for extern inline functions.
 263    An include file foo.h should prepend FOO_INLINE to function
 264    definitions, with the following overall pattern:
 265
 266       [#include any other .h files first.]
 267       ...
 268       INLINE_HEADER_BEGIN
 269       ...
 270       INLINE int
 271       incr (int i)
 272       {
 273         return i + 1;
 274       }
 275       ...
 276       INLINE_HEADER_END
 277
 278    For every executable, exactly one file that includes the header
 279    should do this:
 280
 281       #define INLINE EXTERN_INLINE
 282
 283    before including config.h or any other .h file.
 284    Other .c files should not define INLINE.
 285
 286    C99 compilers compile functions like 'incr' as C99-style extern
 287    inline functions.  Pre-C99 GCCs do something similar with
 288    GNU-specific keywords.  Pre-C99 non-GCC compilers use static
 289    functions, which bloats the code but is good enough.  */
 290
 291 #ifndef INLINE
 292 # define INLINE _GL_INLINE
 293 #endif
 294 #define EXTERN_INLINE _GL_EXTERN_INLINE
 295 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 296 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 297
 298 /* To use the struct hack with N elements, declare the struct like this:
 299      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 300    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 301    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 302 #if 199901 <= __STDC_VERSION__ && !defined __IBMC__
 303 # define FLEXIBLE_ARRAY_MEMBER
 304 #elif __GNUC__ && !defined __STRICT_ANSI__
 305 # define FLEXIBLE_ARRAY_MEMBER 0
 306 #else
 307 # define FLEXIBLE_ARRAY_MEMBER 1
 308 #endif
 309
 310 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 311 #ifdef lint
 312 /* Use CODE only if lint checking is in effect.  */
 313 # define IF_LINT(Code) Code
 314 #else
 315 # define IF_LINT(Code) /* empty */
 316 #endif
 317
 318 /* conf_post.h ends here */