src/conf_post.h

   1 /* conf_post.h --- configure.ac includes this via AH_BOTTOM
   2
   3 Copyright (C) 1988, 1993-1994, 1999-2002, 2004-2017 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 (at
  11 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 /* GNUC_PREREQ (V, W, X) is true if this is GNU C version V.W.X or later.
  38    It can be used in a preprocessor expression.  */
  39 #ifndef __GNUC_MINOR__
  40 # define GNUC_PREREQ(v, w, x) false
  41 #elif ! defined __GNUC_PATCHLEVEL__
  42 # define GNUC_PREREQ(v, w, x) ((v) < __GNUC__ + ((w) <= __GNUC_MINOR__))
  43 #else
  44 # define GNUC_PREREQ(v, w, x) \
  45     ((v) < __GNUC__ + ((w) <= __GNUC_MINOR__ + ((x) <= __GNUC_PATCHLEVEL__)))
  46 #endif
  47
  48 /* The type of bool bitfields.  Needed to compile Objective-C with
  49    standard GCC.  It was also needed to port to pre-C99 compilers,
  50    although we don't care about that any more.  */
  51 #if NS_IMPL_GNUSTEP
  52 typedef unsigned int bool_bf;
  53 #else
  54 typedef bool bool_bf;
  55 #endif
  56
  57 #ifndef WINDOWSNT
  58 /* On AIX 3 this must be included before any other include file.  */
  59 #include <alloca.h>
  60 #if ! HAVE_ALLOCA
  61 # error "alloca not available on this machine"
  62 #endif
  63 #endif
  64
  65 /* Simulate __has_attribute on compilers that lack it.  It is used only
  66    on arguments like alloc_size that are handled in this simulation.  */
  67 #ifndef __has_attribute
  68 # define __has_attribute(a) __has_attribute_##a
  69 # define __has_attribute_alloc_size (4 < __GNUC__ + (3 <= __GNUC_MINOR__))
  70 # define __has_attribute_cleanup (3 < __GNUC__ + (4 <= __GNUC_MINOR__))
  71 # define __has_attribute_externally_visible \
  72     (4 < __GNUC__ + (1 <= __GNUC_MINOR__))
  73 # define __has_attribute_no_address_safety_analysis false
  74 # define __has_attribute_no_sanitize_address \
  75     (4 < __GNUC__ + (8 <= __GNUC_MINOR__))
  76 #endif
  77
  78 /* Simulate __has_feature on compilers that lack it.  It is used only
  79    to define ADDRESS_SANITIZER below.  */
  80 #ifndef __has_feature
  81 # define __has_feature(a) false
  82 #endif
  83
  84 /* True if addresses are being sanitized.  */
  85 #if defined __SANITIZE_ADDRESS__ || __has_feature (address_sanitizer)
  86 # define ADDRESS_SANITIZER true
  87 #else
  88 # define ADDRESS_SANITIZER false
  89 #endif
  90
  91 #ifdef DARWIN_OS
  92 #ifdef emacs
  93 #define malloc unexec_malloc
  94 #define realloc unexec_realloc
  95 #define free unexec_free
  96 #endif
  97 /* The following solves the problem that Emacs hangs when evaluating
  98    (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
  99    does not exist.  Also, setsid is not allowed in the vfork child's
 100    context as of Darwin 9/Mac OS X 10.5.  */
 101 #undef HAVE_WORKING_VFORK
 102 #define vfork fork
 103 #endif  /* DARWIN_OS */
 104
 105 /* If HYBRID_MALLOC is defined (e.g., on Cygwin), emacs will use
 106    gmalloc before dumping and the system malloc after dumping.
 107    hybrid_malloc and friends, defined in gmalloc.c, are wrappers that
 108    accomplish this.  */
 109 #ifdef HYBRID_MALLOC
 110 #ifdef emacs
 111 #define malloc hybrid_malloc
 112 #define realloc hybrid_realloc
 113 #define calloc hybrid_calloc
 114 #define free hybrid_free
 115 #if defined HAVE_GET_CURRENT_DIR_NAME && !defined BROKEN_GET_CURRENT_DIR_NAME
 116 #define HYBRID_GET_CURRENT_DIR_NAME 1
 117 #define get_current_dir_name hybrid_get_current_dir_name
 118 #endif
 119 #endif
 120 #endif  /* HYBRID_MALLOC */
 121
 122 /* We have to go this route, rather than the old hpux9 approach of
 123    renaming the functions via macros.  The system's stdlib.h has fully
 124    prototyped declarations, which yields a conflicting definition of
 125    srand48; it tries to redeclare what was once srandom to be srand48.
 126    So we go with HAVE_LRAND48 being defined.  */
 127 #ifdef HPUX
 128 #undef srandom
 129 #undef random
 130 #undef HAVE_RANDOM
 131 #undef HAVE_RINT
 132 #endif  /* HPUX */
 133
 134 #ifdef IRIX6_5
 135 #ifdef emacs
 136 char *_getpty();
 137 #endif
 138 #define INET6 /* Needed for struct sockaddr_in6.  */
 139 #undef HAVE_GETADDRINFO /* IRIX has getaddrinfo but not struct addrinfo.  */
 140 #endif /* IRIX6_5 */
 141
 142 #ifdef MSDOS
 143 #ifndef __DJGPP__
 144 You lose; /* Emacs for DOS must be compiled with DJGPP */
 145 #endif
 146 #define _NAIVE_DOS_REGS
 147
 148 /* Start of gnulib-related stuff  */
 149
 150 /* lib/ftoastr.c wants strtold, but DJGPP only has _strtold.  DJGPP >
 151    2.03 has it, but it also has _strtold as a stub that jumps to
 152    strtold, so use _strtold in all versions.  */
 153 #define strtold _strtold
 154
 155 #if __DJGPP__ > 2 || __DJGPP_MINOR__ > 3
 156 # define HAVE_LSTAT 1
 157 #else
 158 # define lstat stat
 159 /* DJGPP 2.03 and older don't have the next two.  */
 160 # define EOVERFLOW ERANGE
 161 # define SIZE_MAX  4294967295U
 162 #endif
 163
 164 /* We must intercept 'opendir' calls to stash away the directory name,
 165    so we could reuse it in readlinkat; see msdos.c.  */
 166 #define opendir sys_opendir
 167
 168 /* End of gnulib-related stuff.  */
 169
 170 #define emacs_raise(sig) msdos_fatal_signal (sig)
 171
 172 /* DATA_START is needed by vm-limit.c and unexcoff.c. */
 173 #define DATA_START (&etext + 1)
 174
 175 /* Define one of these for easier conditionals.  */
 176 #ifdef HAVE_X_WINDOWS
 177 /* We need a little extra space, see ../../lisp/loadup.el and the
 178    commentary below, in the non-X branch.  The 140KB number was
 179    measured on GNU/Linux and on MS-Windows.  */
 180 #define SYSTEM_PURESIZE_EXTRA (-170000+140000)
 181 #else
 182 /* We need a little extra space, see ../../lisp/loadup.el.
 183    As of 20091024, DOS-specific files use up 62KB of pure space.  But
 184    overall, we end up wasting 130KB of pure space, because
 185    BASE_PURESIZE starts at 1.47MB, while we need only 1.3MB (including
 186    non-DOS specific files and load history; the latter is about 55K,
 187    but depends on the depth of the top-level Emacs directory in the
 188    directory tree).  Given the unknown policy of different DPMI
 189    hosts regarding loading of untouched pages, I'm not going to risk
 190    enlarging Emacs footprint by another 100+ KBytes.  */
 191 #define SYSTEM_PURESIZE_EXTRA (-170000+90000)
 192 #endif
 193 #endif  /* MSDOS */
 194
 195 /* macOS / GNUstep need a bit more pure memory.  Of the existing knobs,
 196    SYSTEM_PURESIZE_EXTRA seems like the least likely to cause problems.  */
 197 #ifdef HAVE_NS
 198 #if defined NS_IMPL_GNUSTEP
 199 #  define SYSTEM_PURESIZE_EXTRA 30000
 200 #elif defined DARWIN_OS
 201 #  define SYSTEM_PURESIZE_EXTRA 200000
 202 #endif
 203 #endif
 204
 205 #ifdef CYGWIN
 206 #define SYSTEM_PURESIZE_EXTRA 10000
 207 #endif
 208
 209 #if defined HAVE_NTGUI && !defined DebPrint
 210 # ifdef EMACSDEBUG
 211 extern void _DebPrint (const char *fmt, ...);
 212 #  define DebPrint(stuff) _DebPrint stuff
 213 # else
 214 #  define DebPrint(stuff)
 215 # endif
 216 #endif
 217
 218 #if defined CYGWIN && defined HAVE_NTGUI
 219 # define NTGUI_UNICODE /* Cygwin runs only on UNICODE-supporting systems */
 220 # define _WIN32_WINNT 0x500 /* Win2k */
 221 /* The following was in /usr/include/string.h prior to Cygwin 1.7.33.  */
 222 #ifndef strnicmp
 223 #define strnicmp strncasecmp
 224 #endif
 225 #endif
 226
 227 #ifdef emacs /* Don't do this for lib-src.  */
 228 /* Tell regex.c to use a type compatible with Emacs.  */
 229 #define RE_TRANSLATE_TYPE Lisp_Object
 230 #define RE_TRANSLATE(TBL, C) char_table_translate (TBL, C)
 231 #define RE_TRANSLATE_P(TBL) (!EQ (TBL, make_number (0)))
 232 #endif
 233
 234 /* Tell time_rz.c to use Emacs's getter and setter for TZ.
 235    Only Emacs uses time_rz so this is OK.  */
 236 #define getenv_TZ emacs_getenv_TZ
 237 #define setenv_TZ emacs_setenv_TZ
 238 extern char *emacs_getenv_TZ (void);
 239 extern int emacs_setenv_TZ (char const *);
 240
 241 #include <string.h>
 242 #include <stdlib.h>
 243
 244 #if __GNUC__ >= 3  /* On GCC 3.0 we might get a warning.  */
 245 #define NO_INLINE __attribute__((noinline))
 246 #else
 247 #define NO_INLINE
 248 #endif
 249
 250 #if __has_attribute (externally_visible)
 251 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 252 #else
 253 #define EXTERNALLY_VISIBLE
 254 #endif
 255
 256 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
 257 # define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
 258 #else
 259 # define ATTRIBUTE_FORMAT(spec) /* empty */
 260 #endif
 261
 262 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4)
 263 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 264    ATTRIBUTE_FORMAT ((__gnu_printf__, formatstring_parameter, first_argument))
 265 #else
 266 # define ATTRIBUTE_FORMAT_PRINTF(formatstring_parameter, first_argument) \
 267    ATTRIBUTE_FORMAT ((__printf__, formatstring_parameter, first_argument))
 268 #endif
 269
 270 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 271 #define ATTRIBUTE_UNUSED _GL_UNUSED
 272
 273 #if 3 <= __GNUC__
 274 # define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
 275 #else
 276 # define ATTRIBUTE_MALLOC
 277 #endif
 278
 279 #if __has_attribute (alloc_size)
 280 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
 281 #else
 282 # define ATTRIBUTE_ALLOC_SIZE(args)
 283 #endif
 284
 285 #define ATTRIBUTE_MALLOC_SIZE(args) ATTRIBUTE_MALLOC ATTRIBUTE_ALLOC_SIZE (args)
 286
 287 /* Work around GCC bug 59600: when a function is inlined, the inlined
 288    code may have its addresses sanitized even if the function has the
 289    no_sanitize_address attribute.  This bug is fixed in GCC 4.9.0 and
 290    clang 3.4.  */
 291 #if (! ADDRESS_SANITIZER \
 292      || ((4 < __GNUC__ + (9 <= __GNUC_MINOR__)) \
 293          || 3 < __clang_major__ + (4 <= __clang_minor__)))
 294 # define ADDRESS_SANITIZER_WORKAROUND /* No workaround needed.  */
 295 #else
 296 # define ADDRESS_SANITIZER_WORKAROUND NO_INLINE
 297 #endif
 298
 299 /* Attribute of functions whose code should not have addresses
 300    sanitized.  */
 301
 302 #if __has_attribute (no_sanitize_address)
 303 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 304     __attribute__ ((no_sanitize_address)) ADDRESS_SANITIZER_WORKAROUND
 305 #elif __has_attribute (no_address_safety_analysis)
 306 # define ATTRIBUTE_NO_SANITIZE_ADDRESS \
 307     __attribute__ ((no_address_safety_analysis)) ADDRESS_SANITIZER_WORKAROUND
 308 #else
 309 # define ATTRIBUTE_NO_SANITIZE_ADDRESS
 310 #endif
 311
 312 /* Some versions of GNU/Linux define noinline in their headers.  */
 313 #ifdef noinline
 314 #undef noinline
 315 #endif
 316
 317 /* Use Gnulib's extern-inline module for extern inline functions.
 318    An include file foo.h should prepend FOO_INLINE to function
 319    definitions, with the following overall pattern:
 320
 321       [#include any other .h files first.]
 322       ...
 323       INLINE_HEADER_BEGIN
 324       ...
 325       INLINE int
 326       incr (int i)
 327       {
 328         return i + 1;
 329       }
 330       ...
 331       INLINE_HEADER_END
 332
 333    For every executable, exactly one file that includes the header
 334    should do this:
 335
 336       #define INLINE EXTERN_INLINE
 337
 338    before including config.h or any other .h file.
 339    Other .c files should not define INLINE.
 340    For Emacs, this is done by having emacs.c first '#define INLINE
 341    EXTERN_INLINE' and then include every .h file that uses INLINE.
 342
 343    The INLINE_HEADER_BEGIN and INLINE_HEADER_END suppress bogus
 344    warnings in some GCC versions; see ../m4/extern-inline.m4.
 345
 346    C99 compilers compile functions like 'incr' as C99-style extern
 347    inline functions.  Buggy GCC implementations do something similar with
 348    GNU-specific keywords.  Buggy non-GCC compilers use static
 349    functions, which bloats the code but is good enough.  */
 350
 351 #ifndef INLINE
 352 # define INLINE _GL_INLINE
 353 #endif
 354 #define EXTERN_INLINE _GL_EXTERN_INLINE
 355 #define INLINE_HEADER_BEGIN _GL_INLINE_HEADER_BEGIN
 356 #define INLINE_HEADER_END _GL_INLINE_HEADER_END
 357
 358 /* To use the struct hack with N elements, declare the struct like this:
 359      struct s { ...; t name[FLEXIBLE_ARRAY_MEMBER]; };
 360    and allocate (offsetof (struct s, name) + N * sizeof (t)) bytes.
 361    IBM xlc 12.1 claims to do C99 but mishandles flexible array members.  */
 362 #ifdef __IBMC__
 363 # define FLEXIBLE_ARRAY_MEMBER 1
 364 #else
 365 # define FLEXIBLE_ARRAY_MEMBER
 366 #endif
 367
 368 /* Use this to suppress gcc's `...may be used before initialized' warnings. */
 369 #ifdef lint
 370 /* Use CODE only if lint checking is in effect.  */
 371 # define IF_LINT(Code) Code
 372 #else
 373 # define IF_LINT(Code) /* empty */
 374 #endif
 375
 376 /* conf_post.h ends here */