acinclude.m4

   1 dnl ---------------------------------------------------------------------------
   2 dnl
   3 dnl Macros for configure.in for wxWindows by Robert Roebling, Phil Blecker,
   4 dnl Vadim Zeitlin and Ron Lee
   5 dnl
   6 dnl This script is under the wxWindows licence.
   7 dnl
   8 dnl Version: $Id$
   9 dnl ---------------------------------------------------------------------------
  10
  11
  12 dnl ===========================================================================
  13 dnl Objective-C(++) related macros
  14 dnl ===========================================================================
  15 m4_define([AC_WX_LANG_OBJECTIVEC],
  16 [AC_LANG(C)
  17 ac_ext=m
  18 ])
  19
  20 m4_define([AC_WX_LANG_OBJECTIVECPLUSPLUS],
  21 [AC_LANG(C++)
  22 ac_ext=mm
  23 ])
  24
  25 dnl ===========================================================================
  26 dnl macros to find the a file in the list of include/lib paths
  27 dnl ===========================================================================
  28
  29 dnl ---------------------------------------------------------------------------
  30 dnl call WX_PATH_FIND_INCLUDES(search path, header name), sets ac_find_includes
  31 dnl to the full name of the file that was found or leaves it empty if not found
  32 dnl ---------------------------------------------------------------------------
  33 AC_DEFUN([WX_PATH_FIND_INCLUDES],
  34 [
  35 ac_find_includes=
  36 for ac_dir in $1 /usr/include;
  37   do
  38     if test -f "$ac_dir/$2"; then
  39       ac_find_includes=$ac_dir
  40       break
  41     fi
  42   done
  43 ])
  44
  45 dnl ---------------------------------------------------------------------------
  46 dnl call WX_PATH_FIND_LIBRARIES(search path, lib name), sets ac_find_libraries
  47 dnl to the full name of the file that was found or leaves it empty if not found
  48 dnl ---------------------------------------------------------------------------
  49 AC_DEFUN([WX_PATH_FIND_LIBRARIES],
  50 [
  51   ac_find_libraries=
  52   for ac_dir in $1;
  53   do
  54     for ac_extension in a so sl dylib dll.a; do
  55       if test -f "$ac_dir/lib$2.$ac_extension"; then
  56         ac_find_libraries=$ac_dir
  57         break 2
  58       fi
  59     done
  60   done
  61 ])
  62
  63 dnl ---------------------------------------------------------------------------
  64 dnl return list of standard library paths
  65 dnl ---------------------------------------------------------------------------
  66 dnl return all default locations:
  67 dnl   - /usr/lib: standard
  68 dnl   - /usr/lib32: n32 ABI on IRIX
  69 dnl   - /usr/lib64: n64 ABI on IRIX
  70 dnl   - /usr/lib/64: 64 bit ABI on Solaris and Linux x86-64
  71 dnl
  72 dnl NB: if any of directories in the list is not a subdir of /usr, code setting
  73 dnl     wx_cv_std_libpath needs to be updated
  74 AC_DEFUN([WX_STD_LIBPATH], [/usr/lib /usr/lib32 /usr/lib/64 /usr/lib64])
  75
  76 dnl ---------------------------------------------------------------------------
  77 dnl Path to include, already defined
  78 dnl ---------------------------------------------------------------------------
  79 AC_DEFUN([WX_INCLUDE_PATH_EXIST],
  80 [
  81   dnl never add -I/usr/include to the CPPFLAGS
  82   if test "x$1" = "x/usr/include"; then
  83     ac_path_to_include=""
  84   else
  85     echo "$2" | grep "\-I$1" > /dev/null
  86     result=$?
  87     if test $result = 0; then
  88       ac_path_to_include=""
  89     else
  90       ac_path_to_include=" -I$1"
  91     fi
  92   fi
  93 ])
  94
  95 dnl ---------------------------------------------------------------------------
  96 dnl Usage: WX_LINK_PATH_EXIST(path, libpath)
  97 dnl
  98 dnl Set ac_path_to_link to nothing if path is already in libpath of to -Lpath
  99 dnl if it is not, so that libpath can be set to "$libpath$ac_path_to_link"
 100 dnl after calling this function
 101 dnl ---------------------------------------------------------------------------
 102 AC_DEFUN([WX_LINK_PATH_EXIST],
 103 [
 104   dnl never add -L/usr/libXXX explicitely to libpath
 105   if test "$1" = "default location"; then
 106     ac_path_to_link=""
 107   else
 108     echo "$2" | grep "\-L$1" > /dev/null
 109     result=$?
 110     if test $result = 0; then
 111       ac_path_to_link=""
 112     else
 113       ac_path_to_link=" -L$1"
 114     fi
 115   fi
 116 ])
 117
 118 dnl ===========================================================================
 119 dnl C++ features test
 120 dnl ===========================================================================
 121
 122 dnl ---------------------------------------------------------------------------
 123 dnl WX_CPP_NEW_HEADERS checks whether the compiler has "new" <iostream> header
 124 dnl or only the old <iostream.h> one - it may be generally assumed that if
 125 dnl <iostream> exists, the other "new" headers (without .h) exist too.
 126 dnl
 127 dnl call WX_CPP_NEW_HEADERS(actiof-if-true, action-if-false)
 128 dnl ---------------------------------------------------------------------------
 129
 130 AC_DEFUN([WX_CPP_NEW_HEADERS],
 131 [
 132     AC_LANG_SAVE
 133     AC_LANG_CPLUSPLUS
 134
 135     AC_CHECK_HEADERS(iostream)
 136
 137     if test "$ac_cv_header_iostream" = "yes" ; then
 138       ifelse([$1], , :, [$1])
 139     else
 140       ifelse([$2], , :, [$2])
 141     fi
 142
 143     AC_LANG_RESTORE
 144 ])
 145
 146 dnl ---------------------------------------------------------------------------
 147 dnl WX_CPP_BOOL checks whether the C++ compiler has a built in bool type
 148 dnl
 149 dnl call WX_CPP_BOOL - will define HAVE_BOOL if the compiler supports bool
 150 dnl ---------------------------------------------------------------------------
 151
 152 AC_DEFUN([WX_CPP_BOOL],
 153 [
 154   AC_CACHE_CHECK([if C++ compiler supports bool], wx_cv_cpp_bool,
 155   [
 156     AC_LANG_SAVE
 157     AC_LANG_CPLUSPLUS
 158
 159     AC_TRY_COMPILE(
 160       [
 161       ],
 162       [
 163         bool b = true;
 164
 165         return 0;
 166       ],
 167       [
 168         wx_cv_cpp_bool=yes
 169       ],
 170       [
 171         wx_cv_cpp_bool=no
 172       ]
 173     )
 174
 175     AC_LANG_RESTORE
 176   ])
 177
 178   if test "$wx_cv_cpp_bool" = "yes"; then
 179     AC_DEFINE(HAVE_BOOL)
 180   fi
 181 ])
 182
 183 dnl ---------------------------------------------------------------------------
 184 dnl WX_CPP_EXPLICIT checks whether the C++ compiler support the explicit
 185 dnl keyword and defines HAVE_EXPLICIT if this is the case
 186 dnl ---------------------------------------------------------------------------
 187
 188 AC_DEFUN([WX_CPP_EXPLICIT],
 189 [
 190   AC_CACHE_CHECK([if C++ compiler supports the explicit keyword],
 191                  wx_cv_explicit,
 192   [
 193     AC_LANG_SAVE
 194     AC_LANG_CPLUSPLUS
 195
 196     dnl do the test in 2 steps: first check that the compiler knows about the
 197     dnl explicit keyword at all and then verify that it really honours it
 198     AC_TRY_COMPILE(
 199       [
 200         class Foo { public: explicit Foo(int) {} };
 201       ],
 202       [
 203         return 0;
 204       ],
 205       [
 206         AC_TRY_COMPILE(
 207             [
 208                 class Foo { public: explicit Foo(int) {} };
 209                 static void TakeFoo(const Foo& foo) { }
 210             ],
 211             [
 212                 TakeFoo(17);
 213                 return 0;
 214             ],
 215             wx_cv_explicit=no,
 216             wx_cv_explicit=yes
 217         )
 218       ],
 219       wx_cv_explicit=no
 220     )
 221
 222     AC_LANG_RESTORE
 223   ])
 224
 225   if test "$wx_cv_explicit" = "yes"; then
 226     AC_DEFINE(HAVE_EXPLICIT)
 227   fi
 228 ])
 229
 230 dnl ---------------------------------------------------------------------------
 231 dnl a slightly better AC_C_BIGENDIAN macro which allows cross-compiling
 232 dnl ---------------------------------------------------------------------------
 233
 234 AC_DEFUN([WX_C_BIGENDIAN],
 235 [AC_CACHE_CHECK([whether byte ordering is bigendian], ac_cv_c_bigendian,
 236 [ac_cv_c_bigendian=unknown
 237 # See if sys/param.h defines the BYTE_ORDER macro.
 238 AC_TRY_COMPILE([#include <sys/types.h>
 239 #include <sys/param.h>], [
 240 #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
 241  bogus endian macros
 242 #endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
 243 AC_TRY_COMPILE([#include <sys/types.h>
 244 #include <sys/param.h>], [
 245 #if BYTE_ORDER != BIG_ENDIAN
 246  not big endian
 247 #endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
 248 if test $ac_cv_c_bigendian = unknown; then
 249 AC_TRY_RUN([main () {
 250   /* Are we little or big endian?  From Harbison&Steele.  */
 251   union
 252   {
 253     long l;
 254     char c[sizeof (long)];
 255   } u;
 256   u.l = 1;
 257   exit (u.c[sizeof (long) - 1] == 1);
 258 }], [ac_cv_c_bigendian=no], [ac_cv_c_bigendian=yes], [ac_cv_c_bigendian=unknown])
 259 fi])
 260 if test $ac_cv_c_bigendian = unknown; then
 261   AC_MSG_WARN([Assuming little-endian target machine - this may be overriden by adding the line "ac_cv_c_bigendian=${ac_cv_c_bigendian='yes'}" to config.cache file])
 262 fi
 263 if test $ac_cv_c_bigendian = yes; then
 264   AC_DEFINE(WORDS_BIGENDIAN)
 265 fi
 266 ])
 267
 268 dnl ---------------------------------------------------------------------------
 269 dnl override AC_ARG_ENABLE/WITH to cache the results in .cache file
 270 dnl ---------------------------------------------------------------------------
 271
 272 AC_DEFUN([WX_ARG_CACHE_INIT],
 273         [
 274           wx_arg_cache_file="configarg.cache"
 275           echo "loading argument cache $wx_arg_cache_file"
 276           rm -f ${wx_arg_cache_file}.tmp
 277           touch ${wx_arg_cache_file}.tmp
 278           touch ${wx_arg_cache_file}
 279         ])
 280
 281 AC_DEFUN([WX_ARG_CACHE_FLUSH],
 282         [
 283           echo "saving argument cache $wx_arg_cache_file"
 284           mv ${wx_arg_cache_file}.tmp ${wx_arg_cache_file}
 285         ])
 286
 287 dnl this macro checks for a three-valued command line --with argument:
 288 dnl   possible arguments are 'yes', 'no', 'sys', or 'builtin'
 289 dnl usage: WX_ARG_SYS_WITH(option, helpmessage, variable-name)
 290 AC_DEFUN([WX_ARG_SYS_WITH],
 291         [
 292           AC_MSG_CHECKING([for --with-$1])
 293           no_cache=0
 294           AC_ARG_WITH($1, [$2],
 295                       [
 296                         if test "$withval" = yes; then
 297                           ac_cv_use_$1='$3=yes'
 298                         elif test "$withval" = no; then
 299                           ac_cv_use_$1='$3=no'
 300                         elif test "$withval" = sys; then
 301                           ac_cv_use_$1='$3=sys'
 302                         elif test "$withval" = builtin; then
 303                           ac_cv_use_$1='$3=builtin'
 304                         else
 305                           AC_MSG_ERROR([Invalid value for --with-$1: should be yes, no, sys, or builtin])
 306                         fi
 307                       ],
 308                       [
 309                         LINE=`grep "$3" ${wx_arg_cache_file}`
 310                         if test "x$LINE" != x ; then
 311                           eval "DEFAULT_$LINE"
 312                         else
 313                           no_cache=1
 314                         fi
 315
 316                         ac_cv_use_$1='$3='$DEFAULT_$3
 317                       ])
 318
 319           eval "$ac_cv_use_$1"
 320           if test "$no_cache" != 1; then
 321             echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
 322           fi
 323
 324           if test "$$3" = yes; then
 325             AC_MSG_RESULT(yes)
 326           elif test "$$3" = no; then
 327             AC_MSG_RESULT(no)
 328           elif test "$$3" = sys; then
 329             AC_MSG_RESULT([system version])
 330           elif test "$$3" = builtin; then
 331             AC_MSG_RESULT([builtin version])
 332           else
 333             AC_MSG_ERROR([Invalid value for --with-$1: should be yes, no, sys, or builtin])
 334           fi
 335         ])
 336
 337 dnl this macro checks for a command line argument and caches the result
 338 dnl usage: WX_ARG_WITH(option, helpmessage, variable-name)
 339 AC_DEFUN([WX_ARG_WITH],
 340         [
 341           AC_MSG_CHECKING([for --with-$1])
 342           no_cache=0
 343           AC_ARG_WITH($1, [$2],
 344                       [
 345                         if test "$withval" = yes; then
 346                           ac_cv_use_$1='$3=yes'
 347                         else
 348                           ac_cv_use_$1='$3=no'
 349                         fi
 350                       ],
 351                       [
 352                         LINE=`grep "$3" ${wx_arg_cache_file}`
 353                         if test "x$LINE" != x ; then
 354                           eval "DEFAULT_$LINE"
 355                         else
 356                           no_cache=1
 357                         fi
 358
 359                         ac_cv_use_$1='$3='$DEFAULT_$3
 360                       ])
 361
 362           eval "$ac_cv_use_$1"
 363           if test "$no_cache" != 1; then
 364             echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
 365           fi
 366
 367           if test "$$3" = yes; then
 368             AC_MSG_RESULT(yes)
 369           else
 370             AC_MSG_RESULT(no)
 371           fi
 372         ])
 373
 374 dnl like WX_ARG_WITH but uses AC_ARG_ENABLE instead of AC_ARG_WITH
 375 dnl usage: WX_ARG_ENABLE(option, helpmessage, variable-name, enablestring)
 376 dnl
 377 dnl enablestring is a hack and allows to show "checking for --disable-foo"
 378 dnl message when running configure instead of the default "checking for
 379 dnl --enable-foo" one whih is useful for the options enabled by default
 380 AC_DEFUN([WX_ARG_ENABLE],
 381         [
 382           enablestring=$4
 383           AC_MSG_CHECKING([for --${enablestring:-enable}-$1])
 384           no_cache=0
 385           AC_ARG_ENABLE($1, [$2],
 386                         [
 387                           if test "$enableval" = yes; then
 388                             ac_cv_use_$1='$3=yes'
 389                           else
 390                             ac_cv_use_$1='$3=no'
 391                           fi
 392                         ],
 393                         [
 394                           LINE=`grep "$3" ${wx_arg_cache_file}`
 395                           if test "x$LINE" != x ; then
 396                             eval "DEFAULT_$LINE"
 397                           else
 398                             no_cache=1
 399                           fi
 400
 401                           ac_cv_use_$1='$3='$DEFAULT_$3
 402                         ])
 403
 404           eval "$ac_cv_use_$1"
 405           if test "$no_cache" != 1; then
 406             echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
 407           fi
 408
 409           if test "$$3" = yes; then
 410             AC_MSG_RESULT(yes)
 411           else
 412             AC_MSG_RESULT(no)
 413           fi
 414         ])
 415
 416
 417 dnl ===========================================================================
 418 dnl Linker features test
 419 dnl ===========================================================================
 420
 421 dnl ---------------------------------------------------------------------------
 422 dnl WX_VERSIONED_SYMBOLS checks whether the linker can create versioned
 423 dnl symbols. If it can, sets LDFLAGS_VERSIONING to $CXX flags needed to use
 424 dnl version script file named versionfile
 425 dnl
 426 dnl call WX_VERSIONED_SYMBOLS(versionfile)
 427 dnl ---------------------------------------------------------------------------
 428 AC_DEFUN([WX_VERSIONED_SYMBOLS],
 429 [
 430   found_versioning=no
 431
 432   dnl FIXME - doesn't work, Solaris linker doesn't accept wildcards
 433   dnl         in the script.
 434   dnl dnl Check for known non-gcc cases:
 435   dnl case "${host}" in
 436   dnl   *-*-solaris2* )
 437   dnl     if test "x$GCC" != "xyes" ; then
 438   dnl         LDFLAGS_VERSIONING="-M $1"
 439   dnl         found_versioning=yes
 440   dnl     fi
 441   dnl   ;;
 442   dnl esac
 443
 444   dnl Generic check for GCC or GCC-like behaviour (Intel C++, GCC):
 445   if test $found_versioning = no ; then
 446       AC_CACHE_CHECK([if the linker accepts --version-script], wx_cv_version_script,
 447       [
 448         echo "VER_1 { *; };" >conftest.sym
 449         echo "int main() { return 0; }" >conftest.cpp
 450
 451         if AC_TRY_COMMAND([
 452                 $CXX -o conftest.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
 453                 -Wl,--version-script,conftest.sym >/dev/null 2>conftest.stderr]) ; then
 454           if test -s conftest.stderr ; then
 455               wx_cv_version_script=no
 456           else
 457               wx_cv_version_script=yes
 458           fi
 459         else
 460           wx_cv_version_script=no
 461         fi
 462
 463         dnl There's a problem in some old linkers with --version-script that
 464         dnl can cause linking to fail when you have objects with vtables in
 465         dnl libs 3 deep.  This is known to happen in netbsd and openbsd with
 466         dnl ld 2.11.2.
 467         dnl
 468         dnl To test for this we need to make some shared libs and
 469         dnl unfortunately we can't be sure of the right way to do that. If the
 470         dnl first two compiles don't succeed then it looks like the test isn't
 471         dnl working and the result is ignored, but if OTOH the first two
 472         dnl succeed but the third does not then the bug has been detected and
 473         dnl the --version-script flag is dropped.
 474         if test $wx_cv_version_script = yes
 475         then
 476           echo "struct B { virtual ~B() { } }; \
 477                 struct D : public B { }; \
 478                 void F() { D d; }" > conftest.cpp
 479
 480           if AC_TRY_COMMAND([
 481                 $CXX -shared -fPIC -o conftest1.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
 482                 -Wl,--version-script,conftest.sym >/dev/null 2>/dev/null]) &&
 483              AC_TRY_COMMAND([
 484                 $CXX -shared -fPIC -o conftest2.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
 485                 -Wl,--version-script,conftest.sym conftest1.output >/dev/null 2>/dev/null])
 486           then
 487             if AC_TRY_COMMAND([
 488                   $CXX -shared -fPIC -o conftest3.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
 489                   -Wl,--version-script,conftest.sym conftest2.output conftest1.output >/dev/null 2>/dev/null])
 490             then
 491               wx_cv_version_script=yes
 492             else
 493               wx_cv_version_script=no
 494             fi
 495           fi
 496         fi
 497
 498         rm -f conftest.output conftest.stderr conftest.sym conftest.cpp
 499         rm -f conftest1.output conftest2.output conftest3.output
 500       ])
 501       if test $wx_cv_version_script = yes ; then
 502         LDFLAGS_VERSIONING="-Wl,--version-script,$1"
 503       fi
 504   fi
 505 ])
 506
 507
 508 dnl ===========================================================================
 509 dnl "3rd party" macros included here because they are not widely available
 510 dnl ===========================================================================
 511
 512 dnl ---------------------------------------------------------------------------
 513 dnl test for availability of iconv()
 514 dnl ---------------------------------------------------------------------------
 515
 516 dnl From Bruno Haible.
 517
 518 AC_DEFUN([AM_ICONV],
 519 [
 520   dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
 521   dnl those with the standalone portable GNU libiconv installed).
 522
 523   AC_ARG_WITH([libiconv-prefix],
 524 [  --with-libiconv-prefix=DIR  search for libiconv in DIR/include and DIR/lib], [
 525     for dir in `echo "$withval" | tr : ' '`; do
 526       if test -d $dir/include; then CPPFLAGS="$CPPFLAGS -I$dir/include"; fi
 527       if test -d $dir/lib; then LDFLAGS="$LDFLAGS -L$dir/lib"; fi
 528     done
 529    ])
 530
 531   AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
 532     am_cv_func_iconv="no, consider installing GNU libiconv"
 533     am_cv_lib_iconv=no
 534     AC_TRY_LINK([#include <stdlib.h>
 535 #include <iconv.h>],
 536       [iconv_t cd = iconv_open("","");
 537        iconv(cd,NULL,NULL,NULL,NULL);
 538        iconv_close(cd);],
 539       am_cv_func_iconv=yes)
 540     if test "$am_cv_func_iconv" != yes; then
 541       am_save_LIBS="$LIBS"
 542       LIBS="$LIBS -liconv"
 543       AC_TRY_LINK([#include <stdlib.h>
 544 #include <iconv.h>],
 545         [iconv_t cd = iconv_open("","");
 546          iconv(cd,NULL,NULL,NULL,NULL);
 547          iconv_close(cd);],
 548         am_cv_lib_iconv=yes
 549         am_cv_func_iconv=yes)
 550       LIBS="$am_save_LIBS"
 551     fi
 552   ])
 553   if test "$am_cv_func_iconv" = yes; then
 554     AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
 555     AC_CACHE_CHECK([if iconv needs const], wx_cv_func_iconv_const,
 556       AC_TRY_COMPILE([
 557 #include <stdlib.h>
 558 #include <iconv.h>
 559 extern
 560 #ifdef __cplusplus
 561 "C"
 562 #endif
 563 #if defined(__STDC__) || defined(__cplusplus)
 564 size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
 565 #else
 566 size_t iconv();
 567 #endif
 568         ],
 569         [],
 570         wx_cv_func_iconv_const="no",
 571         wx_cv_func_iconv_const="yes"
 572       )
 573     )
 574
 575     iconv_const=
 576     if test "x$wx_cv_func_iconv_const" = "xyes"; then
 577         iconv_const="const"
 578     fi
 579
 580     AC_DEFINE_UNQUOTED(ICONV_CONST, $iconv_const,
 581       [Define as const if the declaration of iconv() needs const.])
 582   fi
 583   LIBICONV=
 584   if test "$am_cv_lib_iconv" = yes; then
 585     LIBICONV="-liconv"
 586   fi
 587   AC_SUBST(LIBICONV)
 588 ])
 589
 590 dnl ---------------------------------------------------------------------------
 591 dnl AC_SYS_LARGEFILE (partly based on the code from autoconf 2.5x)
 592 dnl ---------------------------------------------------------------------------
 593
 594 dnl WX_SYS_LARGEFILE_TEST
 595 dnl
 596 dnl NB: original autoconf test was checking if compiler supported 6 bit off_t
 597 dnl     arithmetic properly but this failed miserably with gcc under Linux
 598 dnl     whereas the system still supports 64 bit files, so now simply check
 599 dnl     that off_t is big enough
 600 define(WX_SYS_LARGEFILE_TEST,
 601 [typedef struct {
 602     unsigned int field: sizeof(off_t) == 8;
 603 } wxlf;
 604 ])
 605
 606
 607 dnl WX_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR)
 608 define(WX_SYS_LARGEFILE_MACRO_VALUE,
 609 [
 610     AC_CACHE_CHECK([for $1 value needed for large files], [$3],
 611         [
 612           AC_TRY_COMPILE([#define $1 $2
 613                           #include <sys/types.h>],
 614                          WX_SYS_LARGEFILE_TEST,
 615                          [$3=$2],
 616                          [$3=no])
 617         ]
 618     )
 619
 620     if test "$$3" != no; then
 621         wx_largefile=yes
 622         AC_DEFINE_UNQUOTED([$1], [$$3])
 623     fi
 624 ])
 625
 626
 627 dnl AC_SYS_LARGEFILE
 628 dnl ----------------
 629 dnl By default, many hosts won't let programs access large files;
 630 dnl one must use special compiler options to get large-file access to work.
 631 dnl For more details about this brain damage please see:
 632 dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
 633 AC_DEFUN([AC_SYS_LARGEFILE],
 634 [AC_ARG_ENABLE(largefile,
 635                [  --disable-largefile     omit support for large files])
 636 if test "$enable_largefile" != no; then
 637     dnl _FILE_OFFSET_BITS==64 is needed for Linux, Solaris, ...
 638     dnl _LARGE_FILES -- for AIX
 639     wx_largefile=no
 640     WX_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, ac_cv_sys_file_offset_bits)
 641     if test "x$wx_largefile" != "xyes"; then
 642         WX_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, ac_cv_sys_large_files)
 643     fi
 644
 645     AC_MSG_CHECKING(if large file support is available)
 646     if test "x$wx_largefile" = "xyes"; then
 647         AC_DEFINE(HAVE_LARGEFILE_SUPPORT)
 648     fi
 649     AC_MSG_RESULT($wx_largefile)
 650 fi
 651 ])
 652
 653
 654 dnl Available from the GNU Autoconf Macro Archive at:
 655 dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_const_cast.html
 656 dnl
 657 AC_DEFUN([AC_CXX_CONST_CAST],
 658 [AC_CACHE_CHECK(whether the compiler supports const_cast<>,
 659 ac_cv_cxx_const_cast,
 660 [AC_LANG_SAVE
 661  AC_LANG_CPLUSPLUS
 662  AC_TRY_COMPILE(,[int x = 0;const int& y = x;int& z = const_cast<int&>(y);return z;],
 663  ac_cv_cxx_const_cast=yes, ac_cv_cxx_const_cast=no)
 664  AC_LANG_RESTORE
 665 ])
 666 if test "$ac_cv_cxx_const_cast" = yes; then
 667   AC_DEFINE(HAVE_CONST_CAST,,[define if the compiler supports const_cast<>])
 668 fi
 669 ])
 670
 671 dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_reinterpret_cast.html
 672 AC_DEFUN([AC_CXX_REINTERPRET_CAST],
 673 [AC_CACHE_CHECK(whether the compiler supports reinterpret_cast<>,
 674 ac_cv_cxx_reinterpret_cast,
 675 [AC_LANG_SAVE
 676  AC_LANG_CPLUSPLUS
 677  AC_TRY_COMPILE([#include <typeinfo>
 678 class Base { public : Base () {} virtual void f () = 0;};
 679 class Derived : public Base { public : Derived () {} virtual void f () {} };
 680 class Unrelated { public : Unrelated () {} };
 681 int g (Unrelated&) { return 0; }],[
 682 Derived d;Base& b=d;Unrelated& e=reinterpret_cast<Unrelated&>(b);return g(e);],
 683  ac_cv_cxx_reinterpret_cast=yes, ac_cv_cxx_reinterpret_cast=no)
 684  AC_LANG_RESTORE
 685 ])
 686 if test "$ac_cv_cxx_reinterpret_cast" = yes; then
 687   AC_DEFINE(HAVE_REINTERPRET_CAST,,
 688             [define if the compiler supports reinterpret_cast<>])
 689 fi
 690 ])
 691
 692 dnl and http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_static_cast.html
 693 AC_DEFUN([AC_CXX_STATIC_CAST],
 694 [AC_CACHE_CHECK(whether the compiler supports static_cast<>,
 695 ac_cv_cxx_static_cast,
 696 [AC_LANG_SAVE
 697  AC_LANG_CPLUSPLUS
 698  AC_TRY_COMPILE([#include <typeinfo>
 699 class Base { public : Base () {} virtual void f () = 0; };
 700 class Derived : public Base { public : Derived () {} virtual void f () {} };
 701 int g (Derived&) { return 0; }],[
 702 Derived d; Base& b = d; Derived& s = static_cast<Derived&> (b); return g (s);],
 703  ac_cv_cxx_static_cast=yes, ac_cv_cxx_static_cast=no)
 704  AC_LANG_RESTORE
 705 ])
 706 if test "$ac_cv_cxx_static_cast" = yes; then
 707   AC_DEFINE(HAVE_STATIC_CAST,, [define if the compiler supports static_cast<>])
 708 fi
 709 ])
 710
 711 dnl http://autoconf-archive.cryp.to/ac_cxx_dynamic_cast.html
 712 AC_DEFUN([AC_CXX_DYNAMIC_CAST],
 713 [AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>,
 714 ac_cv_cxx_dynamic_cast,
 715 [AC_LANG_SAVE
 716  AC_LANG_CPLUSPLUS
 717  AC_TRY_COMPILE([#include <typeinfo>
 718 class Base { public : Base () {} virtual void f () = 0;};
 719 class Derived : public Base { public : Derived () {} virtual void f () {} };],[
 720 Derived d; Base& b=d; return dynamic_cast<Derived*>(&b) ? 0 : 1;],
 721  ac_cv_cxx_dynamic_cast=yes, ac_cv_cxx_dynamic_cast=no)
 722  AC_LANG_RESTORE
 723 ])
 724 if test "$ac_cv_cxx_dynamic_cast" = yes; then
 725   AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>])
 726 fi
 727 ])
 728