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