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 WX_CHECK_FUNCS(FUNCTIONS...,
 232 dnl                [ACTION-IF-FOUND],
 233 dnl                [ACTION-IF-NOT-FOUND],
 234 dnl                [EXTRA-DEFINES-AND-INCLUDES],
 235 dnl                [EXTRA-TEST-CODE])
 236 dnl
 237 dnl Checks that the functions listed in FUNCTIONS exist in the headers and the
 238 dnl libs. For each function, if it is found then defines 'HAVE_FUNCTION' and
 239 dnl executes ACTION-IF-FOUND, otherwise executes ACTION-IF-NOT-FOUND.
 240 dnl
 241 dnl The code from EXTRA-DEFINES-AND-INCLUDES is inserted into the test before
 242 dnl the default headers are included, and EXTRA-TEST-CODE is inserted into
 243 dnl the main() function after the default test for existence.
 244 dnl
 245 dnl Examples:
 246 dnl   # the simple case
 247 dnl   WX_CHECK_FUNCS(stat)
 248 dnl   # use break to finish the loop early
 249 dnl   WX_CHECK_FUNCS(mkstemp mktemp, break)
 250 dnl   # extra defines
 251 dnl   WX_CHECK_FUNCS(strtok_r, [], [], [#define _RREENTRANT])
 252 dnl   # extra includes
 253 dnl   WX_CHECK_FUNCS(swprintf, [], [], [#include <wchar.h>])
 254 dnl   # checking the signature with extra test code
 255 dnl   WX_CHECK_FUNCS(gettimeofday, [], [], [#include <sys/time.h>]
 256 dnl     [struct timeval tv; struct timezone tz; gettimeofday(&tv, &tz)])
 257 dnl ---------------------------------------------------------------------------
 258
 259 AC_DEFUN([WX_CHECK_FUNCS],
 260 [
 261   for wx_func in $1
 262   do
 263     AC_CACHE_CHECK(
 264       [for $wx_func],
 265       [wx_cv_func_$wx_func],
 266       [
 267         AC_LINK_IFELSE(
 268           [
 269             AC_LANG_PROGRAM(
 270               [
 271                 $4
 272                 AC_INCLUDES_DEFAULT
 273               ],
 274               [
 275                 #ifndef $wx_func
 276                   &$wx_func;
 277                 #endif
 278                 $5
 279               ])
 280           ],
 281           [eval wx_cv_func_$wx_func=yes],
 282           [eval wx_cv_func_$wx_func=no])
 283       ])
 284
 285     if eval test \$wx_cv_func_$wx_func = yes
 286     then
 287       AC_DEFINE_UNQUOTED([HAVE_`echo $wx_func | tr 'a-z' 'A-Z'`])
 288       $2
 289     else
 290       :
 291       $3
 292     fi
 293   done
 294 ])
 295
 296 dnl ---------------------------------------------------------------------------
 297 dnl a slightly better AC_C_BIGENDIAN macro which allows cross-compiling
 298 dnl ---------------------------------------------------------------------------
 299
 300 AC_DEFUN([WX_C_BIGENDIAN],
 301 [AC_CACHE_CHECK([whether byte ordering is bigendian], ac_cv_c_bigendian,
 302 [ac_cv_c_bigendian=unknown
 303 # See if sys/param.h defines the BYTE_ORDER macro.
 304 AC_TRY_COMPILE([#include <sys/types.h>
 305 #include <sys/param.h>], [
 306 #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
 307  bogus endian macros
 308 #endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
 309 AC_TRY_COMPILE([#include <sys/types.h>
 310 #include <sys/param.h>], [
 311 #if BYTE_ORDER != BIG_ENDIAN
 312  not big endian
 313 #endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
 314 if test $ac_cv_c_bigendian = unknown; then
 315 AC_TRY_RUN([main () {
 316   /* Are we little or big endian?  From Harbison&Steele.  */
 317   union
 318   {
 319     long l;
 320     char c[sizeof (long)];
 321   } u;
 322   u.l = 1;
 323   exit (u.c[sizeof (long) - 1] == 1);
 324 }], [ac_cv_c_bigendian=no], [ac_cv_c_bigendian=yes], [ac_cv_c_bigendian=unknown])
 325 fi])
 326 if test $ac_cv_c_bigendian = unknown; then
 327   AC_MSG_WARN([Assuming little-endian target machine - this may be overriden by adding the line "ac_cv_c_bigendian=${ac_cv_c_bigendian='yes'}" to config.cache file])
 328 fi
 329 if test $ac_cv_c_bigendian = yes; then
 330   AC_DEFINE(WORDS_BIGENDIAN)
 331 fi
 332 ])
 333
 334 dnl ---------------------------------------------------------------------------
 335 dnl override AC_ARG_ENABLE/WITH to cache the results in .cache file
 336 dnl ---------------------------------------------------------------------------
 337
 338 AC_DEFUN([WX_ARG_CACHE_INIT],
 339         [
 340           wx_arg_cache_file="configarg.cache"
 341           echo "loading argument cache $wx_arg_cache_file"
 342           rm -f ${wx_arg_cache_file}.tmp
 343           touch ${wx_arg_cache_file}.tmp
 344           touch ${wx_arg_cache_file}
 345         ])
 346
 347 AC_DEFUN([WX_ARG_CACHE_FLUSH],
 348         [
 349           echo "saving argument cache $wx_arg_cache_file"
 350           mv ${wx_arg_cache_file}.tmp ${wx_arg_cache_file}
 351         ])
 352
 353 dnl return the name of the variable to store the value of the given
 354 dnl WX_ARG_WITH/ENABLE option
 355 AC_DEFUN([WX_ARG_CACHE_NAME],)
 356
 357 dnl this macro checks for a three-valued command line --with argument:
 358 dnl   possible arguments are 'yes', 'no', 'sys', or 'builtin'
 359 dnl usage: WX_ARG_SYS_WITH(option, helpmessage, variable-name)
 360 dnl
 361 dnl the default value (used if the option is not specified at all) is the value
 362 dnl of wxUSE_ALL_FEATURES (which is "yes" by default but can be changed by
 363 dnl giving configure --disable-all-features option)
 364 AC_DEFUN([WX_ARG_SYS_WITH],
 365         [
 366           AC_MSG_CHECKING([for --with-$1])
 367           no_cache=0
 368           AC_ARG_WITH($1, [$2],
 369                       [
 370                         if test "$withval" = yes; then
 371                           AS_TR_SH(wx_cv_use_$1)='$3=yes'
 372                         elif test "$withval" = no; then
 373                           AS_TR_SH(wx_cv_use_$1)='$3=no'
 374                         elif test "$withval" = sys; then
 375                           AS_TR_SH(wx_cv_use_$1)='$3=sys'
 376                         elif test "$withval" = builtin; then
 377                           AS_TR_SH(wx_cv_use_$1)='$3=builtin'
 378                         else
 379                           AC_MSG_ERROR([Invalid value for --with-$1: should be yes, no, sys, or builtin])
 380                         fi
 381                       ],
 382                       [
 383                         LINE=`grep "^$3=" ${wx_arg_cache_file}`
 384                         if test "x$LINE" != x ; then
 385                           eval "DEFAULT_$LINE"
 386                         else
 387                           no_cache=1
 388                         fi
 389
 390                         AS_TR_SH(wx_cv_use_$1)='$3=${'DEFAULT_$3":-$wxUSE_ALL_FEATURES}"
 391                       ])
 392
 393           eval "$AS_TR_SH(wx_cv_use_$1)"
 394           if test "$no_cache" != 1; then
 395             echo $AS_TR_SH(wx_cv_use_$1) >> ${wx_arg_cache_file}.tmp
 396           fi
 397
 398           if test "$$3" = yes; then
 399             AC_MSG_RESULT(yes)
 400           elif test "$$3" = no; then
 401             AC_MSG_RESULT(no)
 402           elif test "$$3" = sys; then
 403             AC_MSG_RESULT([system version])
 404           elif test "$$3" = builtin; then
 405             AC_MSG_RESULT([builtin version])
 406           else
 407             AC_MSG_ERROR([Invalid value for --with-$1: should be yes, no, sys, or builtin])
 408           fi
 409         ])
 410
 411 dnl this macro checks for a command line argument and caches the result
 412 dnl usage: WX_ARG_WITH(option, helpmessage, variable-name, [withstring])
 413 AC_DEFUN([WX_ARG_WITH],
 414         [
 415           withstring=$4
 416           defaultval=$wxUSE_ALL_FEATURES
 417           if test -z "$defaultval"; then
 418               if test x"$withstring" = xwithout; then
 419                   defaultval=yes
 420               else
 421                   defaultval=no
 422               fi
 423           fi
 424           AC_MSG_CHECKING([for --${withstring:-with}-$1])
 425           no_cache=0
 426           AC_ARG_WITH($1, [$2],
 427                       [
 428                         if test "$withval" = yes; then
 429                           AS_TR_SH(wx_cv_use_$1)='$3=yes'
 430                         else
 431                           AS_TR_SH(wx_cv_use_$1)='$3=no'
 432                         fi
 433                       ],
 434                       [
 435                         LINE=`grep "^$3=" ${wx_arg_cache_file}`
 436                         if test "x$LINE" != x ; then
 437                           eval "DEFAULT_$LINE"
 438                         else
 439                           no_cache=1
 440                         fi
 441
 442                         AS_TR_SH(wx_cv_use_$1)='$3=${'DEFAULT_$3":-$defaultval}"
 443                       ])
 444
 445           eval "$AS_TR_SH(wx_cv_use_$1)"
 446           if test "$no_cache" != 1; then
 447             echo $AS_TR_SH(wx_cv_use_$1) >> ${wx_arg_cache_file}.tmp
 448           fi
 449
 450           if test x"$withstring" = xwithout; then
 451             if test $$3 = yes; then
 452               result=no
 453             else
 454               result=yes
 455             fi
 456           else
 457             result=$$3
 458           fi
 459
 460           AC_MSG_RESULT($result)
 461         ])
 462
 463 dnl same as WX_ARG_WITH but makes it clear that the option is enabled by default
 464 AC_DEFUN([WX_ARG_WITHOUT], [WX_ARG_WITH($1, [$2], $3, without)])
 465
 466 dnl like WX_ARG_WITH but uses AC_ARG_ENABLE instead of AC_ARG_WITH
 467 dnl usage: WX_ARG_ENABLE(option, helpmessage, var, [enablestring], [default])
 468 dnl
 469 dnl enablestring can be omitted or a literal string "disable" and allows to
 470 dnl show "checking for --disable-foo" message when running configure instead of
 471 dnl the default "checking for --enable-foo" one whih is useful for the options
 472 dnl enabled by default
 473 dnl
 474 dnl the "default" argument can be omitted or contain the default value to use
 475 dnl for the option if it's unspecified
 476 AC_DEFUN([WX_ARG_ENABLE],
 477         [
 478           enablestring=$4
 479           defaultval=$5
 480           if test -z "$defaultval"; then
 481               if test x"$enablestring" = xdisable; then
 482                   defaultval=yes
 483               else
 484                   defaultval=no
 485               fi
 486           fi
 487
 488           AC_MSG_CHECKING([for --${enablestring:-enable}-$1])
 489           no_cache=0
 490           AC_ARG_ENABLE($1, [$2],
 491                         [
 492                           if test "$enableval" = yes; then
 493                             AS_TR_SH(wx_cv_use_$1)='$3=yes'
 494                           else
 495                             AS_TR_SH(wx_cv_use_$1)='$3=no'
 496                           fi
 497                         ],
 498                         [
 499                           LINE=`grep "^$3=" ${wx_arg_cache_file}`
 500                           if test "x$LINE" != x ; then
 501                             eval "DEFAULT_$LINE"
 502                           else
 503                             no_cache=1
 504                           fi
 505
 506                           AS_TR_SH(wx_cv_use_$1)='$3=${'DEFAULT_$3":-$defaultval}"
 507                         ])
 508
 509           eval "$AS_TR_SH(wx_cv_use_$1)"
 510           if test "$no_cache" != 1; then
 511             echo $AS_TR_SH(wx_cv_use_$1) >> ${wx_arg_cache_file}.tmp
 512           fi
 513
 514           if test x"$enablestring" = xdisable; then
 515             if test $$3 = yes; then
 516               result=no
 517             else
 518               result=yes
 519             fi
 520           else
 521             result=$$3
 522           fi
 523
 524           AC_MSG_RESULT($result)
 525         ])
 526
 527 dnl the same as WX_ARG_ENABLE but makes it more clear that the option is
 528 dnl enabled by default
 529 AC_DEFUN([WX_ARG_DISABLE], [WX_ARG_ENABLE($1, [$2], $3, disable)])
 530
 531 dnl same as WX_ARG_ENABLE but defaults to wxUSE_ALL_FEATURES instead of "yes"
 532 AC_DEFUN([WX_ARG_FEATURE], [WX_ARG_ENABLE($1, [$2], $3,, $wxUSE_ALL_FEATURES)])
 533
 534 dnl Like WX_ARG_ENABLE but accepts a parameter.
 535 dnl
 536 dnl Usage:
 537 dnl   WX_ARG_ENABLE_PARAM(option, helpmessage, variable-name, enablestring)
 538 dnl
 539 dnl Example:
 540 dnl   WX_ARG_ENABLE_PARAM(foo, [[  --enable-foo[=bar] use foo]], wxUSE_FOO)
 541 dnl
 542 dnl  --enable-foo       wxUSE_FOO=yes
 543 dnl  --disable-foo      wxUSE_FOO=no
 544 dnl  --enable-foo=bar   wxUSE_FOO=bar
 545 dnl  <not given>        value from configarg.cache or
 546 dnl                     wxUSE_FOO=$DEFAULT_wxUSE_FOO
 547 dnl
 548 AC_DEFUN([WX_ARG_ENABLE_PARAM],
 549         [
 550           enablestring=$4
 551           AC_MSG_CHECKING([for --${enablestring:-enable}-$1])
 552           no_cache=0
 553           AC_ARG_ENABLE($1, [$2],
 554                         [
 555                           wx_cv_use_$1="$3='$enableval'"
 556                         ],
 557                         [
 558                           LINE=`grep "^$3=" ${wx_arg_cache_file}`
 559                           if test "x$LINE" != x ; then
 560                             eval "DEFAULT_$LINE"
 561                           else
 562                             no_cache=1
 563                           fi
 564
 565                           wx_cv_use_$1='$3='$DEFAULT_$3
 566                         ])
 567
 568           eval "$wx_cv_use_$1"
 569           if test "$no_cache" != 1; then
 570             echo $wx_cv_use_$1 >> ${wx_arg_cache_file}.tmp
 571           fi
 572
 573           AC_MSG_RESULT([$$3])
 574         ])
 575
 576 dnl ===========================================================================
 577 dnl Linker features test
 578 dnl ===========================================================================
 579
 580 dnl ---------------------------------------------------------------------------
 581 dnl WX_VERSIONED_SYMBOLS checks whether the linker can create versioned
 582 dnl symbols. If it can, sets LDFLAGS_VERSIONING to $CXX flags needed to use
 583 dnl version script file named versionfile
 584 dnl
 585 dnl call WX_VERSIONED_SYMBOLS(versionfile)
 586 dnl ---------------------------------------------------------------------------
 587 AC_DEFUN([WX_VERSIONED_SYMBOLS],
 588 [
 589     case "${host}" in
 590         *-*-cygwin* | *-*-mingw* )
 591             dnl although ld does support version script option on these
 592             dnl platforms, it doesn't make much sense to use it under Win32
 593             dnl and, moreover, this breaks linking because of a bug in handling
 594             dnl paths in -Wl,--version-script,path option (if we ever do need
 595             dnl to use it for cygwin/mingw32, keep in mind that replacing last
 596             dnl comma with the equal sign works) so
 597             dnl simply disable it
 598             wx_cv_version_script=no
 599             ;;
 600
 601         *)
 602             AC_CACHE_CHECK([if the linker accepts --version-script], wx_cv_version_script,
 603             [
 604                 echo "VER_1 { *; };" >conftest.sym
 605                 echo "int main() { return 0; }" >conftest.cpp
 606
 607                 if AC_TRY_COMMAND([
 608                         $CXX -o conftest.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
 609                         -Wl,--version-script,conftest.sym >/dev/null 2>conftest.stderr]) ; then
 610                   if test -s conftest.stderr ; then
 611                       wx_cv_version_script=no
 612                   else
 613                       wx_cv_version_script=yes
 614                   fi
 615                 else
 616                   wx_cv_version_script=no
 617                 fi
 618
 619                 dnl There's a problem in some old linkers with --version-script that
 620                 dnl can cause linking to fail when you have objects with vtables in
 621                 dnl libs 3 deep.  This is known to happen in netbsd and openbsd with
 622                 dnl ld 2.11.2.
 623                 dnl
 624                 dnl To test for this we need to make some shared libs and
 625                 dnl unfortunately we can't be sure of the right way to do that. If the
 626                 dnl first two compiles don't succeed then it looks like the test isn't
 627                 dnl working and the result is ignored, but if OTOH the first two
 628                 dnl succeed but the third does not then the bug has been detected and
 629                 dnl the --version-script flag is dropped.
 630                 if test $wx_cv_version_script = yes
 631                 then
 632                   echo "struct B { virtual ~B() { } }; \
 633                         struct D : public B { }; \
 634                         void F() { D d; }" > conftest.cpp
 635
 636                   if AC_TRY_COMMAND([
 637                         $CXX -shared -fPIC -o conftest1.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
 638                         -Wl,--version-script,conftest.sym >/dev/null 2>/dev/null]) &&
 639                      AC_TRY_COMMAND([
 640                         $CXX -shared -fPIC -o conftest2.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
 641                         -Wl,--version-script,conftest.sym conftest1.output >/dev/null 2>/dev/null])
 642                   then
 643                     if AC_TRY_COMMAND([
 644                           $CXX -shared -fPIC -o conftest3.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
 645                           -Wl,--version-script,conftest.sym conftest2.output conftest1.output >/dev/null 2>/dev/null])
 646                     then
 647                       wx_cv_version_script=yes
 648                     else
 649                       wx_cv_version_script=no
 650                     fi
 651                   fi
 652                 fi
 653
 654                 rm -f conftest.output conftest.stderr conftest.sym conftest.cpp
 655                 rm -f conftest1.output conftest2.output conftest3.output
 656             ])
 657
 658             if test $wx_cv_version_script = yes ; then
 659                 LDFLAGS_VERSIONING="-Wl,--version-script,$1"
 660             fi
 661             ;;
 662     esac
 663 ])
 664
 665
 666 dnl ===========================================================================
 667 dnl "3rd party" macros included here because they are not widely available
 668 dnl ===========================================================================
 669
 670 dnl ---------------------------------------------------------------------------
 671 dnl test for availability of iconv()
 672 dnl ---------------------------------------------------------------------------
 673
 674 dnl From Bruno Haible.
 675
 676 AC_DEFUN([AM_ICONV],
 677 [
 678   dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
 679   dnl those with the standalone portable GNU libiconv installed).
 680
 681   AC_ARG_WITH([libiconv-prefix],
 682 [  --with-libiconv-prefix=DIR  search for libiconv in DIR/include and DIR/lib], [
 683     for dir in `echo "$withval" | tr : ' '`; do
 684       if test -d $dir/include; then CPPFLAGS="$CPPFLAGS -I$dir/include"; fi
 685       if test -d $dir/lib; then LDFLAGS="$LDFLAGS -L$dir/lib"; fi
 686     done
 687    ])
 688
 689   AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
 690     am_cv_func_iconv="no, consider installing GNU libiconv"
 691     am_cv_lib_iconv=no
 692     AC_TRY_LINK([#include <stdlib.h>
 693 #include <iconv.h>],
 694       [iconv_t cd = iconv_open("","");
 695        iconv(cd,NULL,NULL,NULL,NULL);
 696        iconv_close(cd);],
 697       am_cv_func_iconv=yes)
 698     if test "$am_cv_func_iconv" != yes; then
 699       am_save_LIBS="$LIBS"
 700       LIBS="$LIBS -liconv"
 701       AC_TRY_LINK([#include <stdlib.h>
 702 #include <iconv.h>],
 703         [iconv_t cd = iconv_open("","");
 704          iconv(cd,NULL,NULL,NULL,NULL);
 705          iconv_close(cd);],
 706         am_cv_lib_iconv=yes
 707         am_cv_func_iconv=yes)
 708       LIBS="$am_save_LIBS"
 709     fi
 710   ])
 711   if test "$am_cv_func_iconv" = yes; then
 712     AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
 713     AC_CACHE_CHECK([if iconv needs const], wx_cv_func_iconv_const,
 714       AC_TRY_COMPILE([
 715 #include <stdlib.h>
 716 #include <iconv.h>
 717 extern
 718 #ifdef __cplusplus
 719 "C"
 720 #endif
 721 #if defined(__STDC__) || defined(__cplusplus)
 722 size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
 723 #else
 724 size_t iconv();
 725 #endif
 726         ],
 727         [],
 728         wx_cv_func_iconv_const="no",
 729         wx_cv_func_iconv_const="yes"
 730       )
 731     )
 732
 733     iconv_const=
 734     if test "x$wx_cv_func_iconv_const" = "xyes"; then
 735         iconv_const="const"
 736     fi
 737
 738     AC_DEFINE_UNQUOTED(ICONV_CONST, $iconv_const,
 739       [Define as const if the declaration of iconv() needs const.])
 740   fi
 741   LIBICONV=
 742   if test "$am_cv_lib_iconv" = yes; then
 743     LIBICONV="-liconv"
 744   fi
 745   AC_SUBST(LIBICONV)
 746 ])
 747
 748 dnl ---------------------------------------------------------------------------
 749 dnl AC_SYS_LARGEFILE (partly based on the code from autoconf 2.5x)
 750 dnl ---------------------------------------------------------------------------
 751
 752 dnl WX_SYS_LARGEFILE_TEST
 753 dnl
 754 dnl NB: original autoconf test was checking if compiler supported 6 bit off_t
 755 dnl     arithmetic properly but this failed miserably with gcc under Linux
 756 dnl     whereas the system still supports 64 bit files, so now simply check
 757 dnl     that off_t is big enough
 758 define(WX_SYS_LARGEFILE_TEST,
 759 [typedef struct {
 760     unsigned int field: sizeof(off_t) == 8;
 761 } wxlf;
 762 ])
 763
 764
 765 dnl WX_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR)
 766 define(WX_SYS_LARGEFILE_MACRO_VALUE,
 767 [
 768     AC_CACHE_CHECK([for $1 value needed for large files], [$3],
 769         [
 770           AC_TRY_COMPILE([#define $1 $2
 771                           #include <sys/types.h>],
 772                          WX_SYS_LARGEFILE_TEST,
 773                          [$3=$2],
 774                          [$3=no])
 775         ]
 776     )
 777
 778     if test "$$3" != no; then
 779         wx_largefile=yes
 780         AC_DEFINE_UNQUOTED([$1], [$$3])
 781     fi
 782 ])
 783
 784
 785 dnl AC_SYS_LARGEFILE
 786 dnl ----------------
 787 dnl By default, many hosts won't let programs access large files;
 788 dnl one must use special compiler options to get large-file access to work.
 789 dnl For more details about this brain damage please see:
 790 dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
 791 AC_DEFUN([AC_SYS_LARGEFILE],
 792 [AC_ARG_ENABLE(largefile,
 793                [  --disable-largefile     omit support for large files])
 794 if test "$enable_largefile" != no; then
 795     dnl _FILE_OFFSET_BITS==64 is needed for Linux, Solaris, ...
 796     dnl _LARGE_FILES -- for AIX
 797     wx_largefile=no
 798     WX_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64, ac_cv_sys_file_offset_bits)
 799     if test "x$wx_largefile" != "xyes"; then
 800         WX_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1, ac_cv_sys_large_files)
 801     fi
 802
 803     AC_MSG_CHECKING(if large file support is available)
 804     if test "x$wx_largefile" = "xyes"; then
 805         AC_DEFINE(HAVE_LARGEFILE_SUPPORT)
 806     fi
 807     AC_MSG_RESULT($wx_largefile)
 808 fi
 809 ])
 810
 811
 812 dnl Available from the GNU Autoconf Macro Archive at:
 813 dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_const_cast.html
 814 dnl
 815 AC_DEFUN([AC_CXX_CONST_CAST],
 816 [AC_CACHE_CHECK(whether the compiler supports const_cast<>,
 817 ac_cv_cxx_const_cast,
 818 [AC_LANG_SAVE
 819  AC_LANG_CPLUSPLUS
 820  AC_TRY_COMPILE(,[int x = 0;const int& y = x;int& z = const_cast<int&>(y);return z;],
 821  ac_cv_cxx_const_cast=yes, ac_cv_cxx_const_cast=no)
 822  AC_LANG_RESTORE
 823 ])
 824 if test "$ac_cv_cxx_const_cast" = yes; then
 825   AC_DEFINE(HAVE_CONST_CAST,,[define if the compiler supports const_cast<>])
 826 fi
 827 ])
 828
 829 dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_reinterpret_cast.html
 830 AC_DEFUN([AC_CXX_REINTERPRET_CAST],
 831 [AC_CACHE_CHECK(whether the compiler supports reinterpret_cast<>,
 832 ac_cv_cxx_reinterpret_cast,
 833 [AC_LANG_SAVE
 834  AC_LANG_CPLUSPLUS
 835  AC_TRY_COMPILE([#include <typeinfo>
 836 class Base { public : Base () {} virtual void f () = 0;};
 837 class Derived : public Base { public : Derived () {} virtual void f () {} };
 838 class Unrelated { public : Unrelated () {} };
 839 int g (Unrelated&) { return 0; }],[
 840 Derived d;Base& b=d;Unrelated& e=reinterpret_cast<Unrelated&>(b);return g(e);],
 841  ac_cv_cxx_reinterpret_cast=yes, ac_cv_cxx_reinterpret_cast=no)
 842  AC_LANG_RESTORE
 843 ])
 844 if test "$ac_cv_cxx_reinterpret_cast" = yes; then
 845   AC_DEFINE(HAVE_REINTERPRET_CAST,,
 846             [define if the compiler supports reinterpret_cast<>])
 847 fi
 848 ])
 849
 850 dnl and http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_static_cast.html
 851 AC_DEFUN([AC_CXX_STATIC_CAST],
 852 [AC_CACHE_CHECK(whether the compiler supports static_cast<>,
 853 ac_cv_cxx_static_cast,
 854 [AC_LANG_SAVE
 855  AC_LANG_CPLUSPLUS
 856  AC_TRY_COMPILE([#include <typeinfo>
 857 class Base { public : Base () {} virtual void f () = 0; };
 858 class Derived : public Base { public : Derived () {} virtual void f () {} };
 859 int g (Derived&) { return 0; }],[
 860 Derived d; Base& b = d; Derived& s = static_cast<Derived&> (b); return g (s);],
 861  ac_cv_cxx_static_cast=yes, ac_cv_cxx_static_cast=no)
 862  AC_LANG_RESTORE
 863 ])
 864 if test "$ac_cv_cxx_static_cast" = yes; then
 865   AC_DEFINE(HAVE_STATIC_CAST,, [define if the compiler supports static_cast<>])
 866 fi
 867 ])
 868
 869 dnl http://autoconf-archive.cryp.to/ac_cxx_dynamic_cast.html
 870 AC_DEFUN([AC_CXX_DYNAMIC_CAST],
 871 [AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>,
 872 ac_cv_cxx_dynamic_cast,
 873 [AC_LANG_SAVE
 874  AC_LANG_CPLUSPLUS
 875  AC_TRY_COMPILE([#include <typeinfo>
 876 class Base { public : Base () {} virtual void f () = 0;};
 877 class Derived : public Base { public : Derived () {} virtual void f () {} };],[
 878 Derived d; Base& b=d; return dynamic_cast<Derived*>(&b) ? 0 : 1;],
 879  ac_cv_cxx_dynamic_cast=yes, ac_cv_cxx_dynamic_cast=no)
 880  AC_LANG_RESTORE
 881 ])
 882 if test "$ac_cv_cxx_dynamic_cast" = yes; then
 883   AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>])
 884 fi
 885 ])
 886