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