acinclude.m4

   1 # AST_GCC_ATTRIBUTE([attribute name])
   2
   3 AC_DEFUN([AST_GCC_ATTRIBUTE],
   4 [
   5 AC_MSG_CHECKING(for compiler 'attribute $1' support)
   6 AC_COMPILE_IFELSE(
   7         AC_LANG_PROGRAM([static int __attribute__(($1)) test(void) {}],
   8                         []),
   9         AC_MSG_RESULT(yes)
  10         AC_DEFINE_UNQUOTED([HAVE_ATTRIBUTE_$1], 1, [Define to 1 if your GCC C compiler supports the '$1' attribute.]),
  11         AC_MSG_RESULT(no))
  12 ])
  13
  14 # AST_EXT_LIB_SETUP([package symbol name], [package friendly name], [package option name], [additional help text])
  15
  16 AC_DEFUN([AST_EXT_LIB_SETUP],
  17 [
  18 $1_DESCRIP="$2"
  19 $1_OPTION="$3"
  20 AC_ARG_WITH([$3], AC_HELP_STRING([--with-$3=PATH],[use $2 files in PATH $4]),[
  21 case ${withval} in
  22      n|no)
  23      USE_$1=no
  24      ;;
  25      y|ye|yes)
  26      ac_mandatory_list="${ac_mandatory_list} $1"
  27      ;;
  28      *)
  29      $1_DIR="${withval}"
  30      ac_mandatory_list="${ac_mandatory_list} $1"
  31      ;;
  32 esac
  33 ])
  34 PBX_$1=0
  35 AC_SUBST([$1_LIB])
  36 AC_SUBST([$1_INCLUDE])
  37 AC_SUBST([PBX_$1])
  38 ])
  39
  40 # Check whether any of the mandatory modules are not present, and
  41 # print error messages in case.
  42
  43 AC_DEFUN([AST_CHECK_MANDATORY],
  44 [
  45         AC_MSG_CHECKING([for mandatory modules: ${ac_mandatory_list}])
  46         err=0;
  47         for i in ${ac_mandatory_list}; do
  48                 eval "a=\${PBX_$i}"
  49                 if test "x${a}" = "x1" ; then continue; fi
  50                 if test ${err} = "0" ; then AC_MSG_RESULT(fail) ; fi
  51                 AC_MSG_RESULT()
  52                 eval "a=\${${i}_OPTION}"
  53                 AC_MSG_NOTICE(***)
  54                 AC_MSG_NOTICE(*** The $i installation appears to be missing or broken.)
  55                 AC_MSG_NOTICE(*** Either correct the installation, or run configure)
  56                 AC_MSG_NOTICE(*** including --without-${a}.)
  57                 err=1
  58         done
  59         if test $err = 1 ; then exit 1; fi
  60         AC_MSG_RESULT(ok)
  61 ])
  62
  63 #-- The following two tests are only performed if PBX_$1 != 1,
  64 #   so you can use multiple tests and stop at the first matching one.
  65 #   On success, set PBX_$1 = 1, and also #define HAVE_$1 1
  66 #   and #define HAVE_$1_VERSION ${last_argument} so you can tell which
  67 #   test succeeded.
  68 #   They should be called after AST_EXT_LIB_SETUP($1, ...)
  69
  70 # Check if a given macro is defined in a certain header.
  71
  72 # AST_C_DEFINE_CHECK([package symbol name], [macro name], [header file], [version])
  73 AC_DEFUN([AST_C_DEFINE_CHECK],
  74 [
  75     if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
  76         AC_MSG_CHECKING([for $2 in $3])
  77         saved_cppflags="${CPPFLAGS}"
  78         if test "x${$1_DIR}" != "x"; then
  79             $1_INCLUDE= "-I${$1_DIR}/include"
  80         fi
  81         CPPFLAGS="${CPPFLAGS} ${$1_INCLUDE}"
  82
  83         AC_COMPILE_IFELSE(
  84             [ AC_LANG_PROGRAM( [#include <$3>], [int foo = $2;]) ],
  85             [   AC_MSG_RESULT(yes)
  86                 PBX_$1=1
  87                 AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 headers.])
  88                 AC_DEFINE([HAVE_$1_VERSION], $4, [Define $1 headers version])
  89             ],
  90             [       AC_MSG_RESULT(no) ]
  91         )
  92         CPPFLAGS="${saved_cppflags}"
  93     fi
  94 ])
  95
  96
  97 # Check for existence of a given package ($1), either looking up a function
  98 # in a library, or, if no function is supplied, only check for the
  99 # existence of the header files.
 100
 101 # AST_EXT_LIB_CHECK([package symbol name], [package library name], [function to check], [package header], [additional LIB data], [version])
 102 AC_DEFUN([AST_EXT_LIB_CHECK],
 103 [
 104 if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
 105    pbxlibdir=""
 106    if test "x${$1_DIR}" != "x"; then
 107       if test -d ${$1_DIR}/lib; then
 108          pbxlibdir="-L${$1_DIR}/lib"
 109       else
 110          pbxlibdir="-L${$1_DIR}"
 111       fi
 112    fi
 113    pbxfuncname="$3"
 114    if test "x${pbxfuncname}" = "x" ; then   # empty lib, assume only headers
 115       AST_$1_FOUND=yes
 116    else
 117       AC_CHECK_LIB([$2], [${pbxfuncname}], [AST_$1_FOUND=yes], [AST_$1_FOUND=no], ${pbxlibdir} $5)
 118    fi
 119
 120    if test "${AST_$1_FOUND}" = "yes"; then
 121       $1_LIB="-l$2 $5"
 122       $1_HEADER_FOUND="1"
 123       if test "x${$1_DIR}" != "x"; then
 124          $1_LIB="${pbxlibdir} ${$1_LIB}"
 125          $1_INCLUDE="-I${$1_DIR}/include"
 126          if test "x$4" != "x" ; then
 127             AC_CHECK_HEADER([${$1_DIR}/include/$4], [$1_HEADER_FOUND=1], [$1_HEADER_FOUND=0] )
 128          fi
 129       else
 130          if test "x$4" != "x" ; then
 131             AC_CHECK_HEADER([$4], [$1_HEADER_FOUND=1], [$1_HEADER_FOUND=0] )
 132          fi
 133       fi
 134       if test "x${$1_HEADER_FOUND}" = "x0" ; then
 135          $1_LIB=""
 136          $1_INCLUDE=""
 137       else
 138          if test "x${pbxfuncname}" = "x" ; then         # only checking headers -> no library
 139             $1_LIB=""
 140          fi
 141          PBX_$1=1
 142          # XXX don't know how to evaluate the description (third argument) in AC_DEFINE_UNQUOTED
 143          AC_DEFINE_UNQUOTED([HAVE_$1], 1, [Define this to indicate the ${$1_DESCRIP} library])
 144          AC_DEFINE_UNQUOTED([HAVE_$1_VERSION], [$6], [Define to indicate the ${$1_DESCRIP} library version])
 145       fi
 146    fi
 147 fi
 148 ])
 149
 150
 151 AC_DEFUN(
 152 [AST_CHECK_GNU_MAKE], [AC_CACHE_CHECK(for GNU make, GNU_MAKE,
 153    GNU_MAKE='Not Found' ;
 154    GNU_MAKE_VERSION_MAJOR=0 ;
 155    GNU_MAKE_VERSION_MINOR=0 ;
 156    for a in make gmake gnumake ; do
 157       if test -z "$a" ; then continue ; fi ;
 158       if ( sh -c "$a --version" 2> /dev/null | grep GNU  2>&1 > /dev/null ) ;  then
 159          GNU_MAKE=$a ;
 160          GNU_MAKE_VERSION_MAJOR=`$GNU_MAKE --version | grep "GNU Make" | cut -f3 -d' ' | cut -f1 -d'.'`
 161          GNU_MAKE_VERSION_MINOR=`$GNU_MAKE --version | grep "GNU Make" | cut -f2 -d'.' | cut -c1-2`
 162          break;
 163       fi
 164    done ;
 165 ) ;
 166 if test  "x$GNU_MAKE" = "xNot Found"  ; then
 167    AC_MSG_ERROR( *** Please install GNU make.  It is required to build Asterisk!)
 168    exit 1
 169 fi
 170 AC_SUBST([GNU_MAKE])
 171 ])
 172
 173
 174 AC_DEFUN(
 175 [AST_CHECK_PWLIB], [
 176 PWLIB_INCDIR=
 177 PWLIB_LIBDIR=
 178 if test "${PWLIBDIR:-unset}" != "unset" ; then
 179   AC_CHECK_FILE(${PWLIBDIR}/version.h, HAS_PWLIB=1, )
 180 fi
 181 if test "${HAS_PWLIB:-unset}" = "unset" ; then
 182   if test "${OPENH323DIR:-unset}" != "unset"; then
 183     AC_CHECK_FILE(${OPENH323DIR}/../pwlib/version.h, HAS_PWLIB=1, )
 184   fi
 185   if test "${HAS_PWLIB:-unset}" != "unset" ; then
 186     PWLIBDIR="${OPENH323DIR}/../pwlib"
 187   else
 188     AC_CHECK_FILE(${HOME}/pwlib/include/ptlib.h, HAS_PWLIB=1, )
 189     if test "${HAS_PWLIB:-unset}" != "unset" ; then
 190       PWLIBDIR="${HOME}/pwlib"
 191     else
 192       AC_CHECK_FILE(/usr/local/include/ptlib.h, HAS_PWLIB=1, )
 193       if test "${HAS_PWLIB:-unset}" != "unset" ; then
 194         AC_PATH_PROG(PTLIB_CONFIG, ptlib-config, , /usr/local/bin)
 195         if test "${PTLIB_CONFIG:-unset}" = "unset" ; then
 196           AC_PATH_PROG(PTLIB_CONFIG, ptlib-config, , /usr/local/share/pwlib/make)
 197         fi
 198         PWLIB_INCDIR="/usr/local/include"
 199         if test "x$LIB64" != "x"; then
 200           PWLIB_LIBDIR="/usr/local/lib64"
 201         else
 202           PWLIB_LIBDIR="/usr/local/lib"
 203         fi
 204       else
 205         AC_CHECK_FILE(/usr/include/ptlib.h, HAS_PWLIB=1, )
 206         if test "${HAS_PWLIB:-unset}" != "unset" ; then
 207           AC_PATH_PROG(PTLIB_CONFIG, ptlib-config, , /usr/share/pwlib/make)
 208           PWLIB_INCDIR="/usr/include"
 209           if test "x$LIB64" != "x"; then
 210                 PWLIB_LIBDIR="/usr/lib64"
 211           else
 212                 PWLIB_LIBDIR="/usr/lib"
 213               fi
 214         fi
 215       fi
 216     fi
 217   fi
 218 fi
 219
 220 #if test "${HAS_PWLIB:-unset}" = "unset" ; then
 221 #  echo "Cannot find pwlib - please install or set PWLIBDIR and try again"
 222 #  exit
 223 #fi
 224
 225 if test "${HAS_PWLIB:-unset}" != "unset" ; then
 226   if test "${PWLIBDIR:-unset}" = "unset" ; then
 227     if test "${PTLIB_CONFIG:-unset}" != "unset" ; then
 228       PWLIBDIR=`$PTLIB_CONFIG --prefix`
 229     else
 230       echo "Cannot find ptlib-config - please install and try again"
 231       exit
 232     fi
 233   fi
 234
 235   if test "x$PWLIBDIR" = "x/usr" -o "x$PWLIBDIR" = "x/usr/"; then
 236     PWLIBDIR="/usr/share/pwlib"
 237     PWLIB_INCDIR="/usr/include"
 238     if test "x$LIB64" != "x"; then
 239       PWLIB_LIBDIR="/usr/lib64"
 240     else
 241       PWLIB_LIBDIR="/usr/lib"
 242     fi
 243   fi
 244   if test "x$PWLIBDIR" = "x/usr/local" -o "x$PWLIBDIR" = "x/usr/"; then
 245     PWLIBDIR="/usr/local/share/pwlib"
 246     PWLIB_INCDIR="/usr/local/include"
 247     if test "x$LIB64" != "x"; then
 248       PWLIB_LIBDIR="/usr/local/lib64"
 249     else
 250       PWLIB_LIBDIR="/usr/local/lib"
 251     fi
 252   fi
 253
 254   if test "${PWLIB_INCDIR:-unset}" = "unset"; then
 255     PWLIB_INCDIR="${PWLIBDIR}/include"
 256   fi
 257   if test "${PWLIB_LIBDIR:-unset}" = "unset"; then
 258     PWLIB_LIBDIR="${PWLIBDIR}/lib"
 259   fi
 260
 261   AC_SUBST([PWLIBDIR])
 262   AC_SUBST([PWLIB_INCDIR])
 263   AC_SUBST([PWLIB_LIBDIR])
 264 fi
 265 ])
 266
 267
 268 AC_DEFUN(
 269 [AST_CHECK_OPENH323_PLATFORM], [
 270 PWLIB_OSTYPE=
 271 case "$host_os" in
 272   linux*)          PWLIB_OSTYPE=linux ;
 273                 ;;
 274   freebsd* )       PWLIB_OSTYPE=FreeBSD ;
 275                 ;;
 276   openbsd* )       PWLIB_OSTYPE=OpenBSD ;
 277                                    ENDLDLIBS="-lossaudio" ;
 278                 ;;
 279   netbsd* )        PWLIB_OSTYPE=NetBSD ;
 280                                    ENDLDLIBS="-lossaudio" ;
 281                 ;;
 282   solaris* | sunos* ) PWLIB_OSTYPE=solaris ;
 283                 ;;
 284   darwin* )            PWLIB_OSTYPE=Darwin ;
 285                 ;;
 286   beos*)           PWLIB_OSTYPE=beos ;
 287                    STDCCFLAGS="$STDCCFLAGS -D__BEOS__"
 288                 ;;
 289   cygwin*)         PWLIB_OSTYPE=cygwin ;
 290                 ;;
 291   mingw*)              PWLIB_OSTYPE=mingw ;
 292                            STDCCFLAGS="$STDCCFLAGS -mms-bitfields" ;
 293                            ENDLDLIBS="-lwinmm -lwsock32 -lsnmpapi -lmpr -lcomdlg32 -lgdi32 -lavicap32" ;
 294                 ;;
 295   * )                  PWLIB_OSTYPE="$host_os" ;
 296                            AC_MSG_WARN("OS $PWLIB_OSTYPE not recognized - proceed with caution!") ;
 297                 ;;
 298 esac
 299
 300 PWLIB_MACHTYPE=
 301 case "$host_cpu" in
 302    x86 | i686 | i586 | i486 | i386 ) PWLIB_MACHTYPE=x86
 303                    ;;
 304
 305    x86_64)         PWLIB_MACHTYPE=x86_64 ;
 306                    P_64BIT=1 ;
 307                    LIB64=1 ;
 308                    ;;
 309
 310    alpha | alphaev56 | alphaev6 | alphaev67 | alphaev7) PWLIB_MACHTYPE=alpha ;
 311                    P_64BIT=1 ;
 312                    ;;
 313
 314    sparc )         PWLIB_MACHTYPE=sparc ;
 315                    ;;
 316
 317    powerpc )       PWLIB_MACHTYPE=ppc ;
 318                    ;;
 319
 320    ppc )           PWLIB_MACHTYPE=ppc ;
 321                    ;;
 322
 323    powerpc64 )     PWLIB_MACHTYPE=ppc64 ;
 324                    P_64BIT=1 ;
 325                    LIB64=1 ;
 326                    ;;
 327
 328    ppc64 )         PWLIB_MACHTYPE=ppc64 ;
 329                    P_64BIT=1 ;
 330                    LIB64=1 ;
 331                    ;;
 332
 333    ia64)           PWLIB_MACHTYPE=ia64 ;
 334                    P_64BIT=1 ;
 335                    ;;
 336
 337    s390x)          PWLIB_MACHTYPE=s390x ;
 338                    P_64BIT=1 ;
 339                    LIB64=1 ;
 340                    ;;
 341
 342    s390)           PWLIB_MACHTYPE=s390 ;
 343                    ;;
 344
 345    * )             PWLIB_MACHTYPE="$host_cpu";
 346                    AC_MSG_WARN("CPU $PWLIB_MACHTYPE not recognized - proceed with caution!") ;;
 347 esac
 348
 349 PWLIB_PLATFORM="${PWLIB_OSTYPE}_${PWLIB_MACHTYPE}"
 350
 351 AC_SUBST([PWLIB_PLATFORM])
 352 ])
 353
 354
 355 AC_DEFUN(
 356 [AST_CHECK_OPENH323], [
 357 OPENH323_INCDIR=
 358 OPENH323_LIBDIR=
 359 if test "${OPENH323DIR:-unset}" != "unset" ; then
 360   AC_CHECK_FILE(${OPENH323DIR}/version.h, HAS_OPENH323=1, )
 361 fi
 362 if test "${HAS_OPENH323:-unset}" = "unset" ; then
 363   AC_CHECK_FILE(${PWLIBDIR}/../openh323/version.h, OPENH323DIR="${PWLIBDIR}/../openh323"; HAS_OPENH323=1, )
 364   if test "${HAS_OPENH323:-unset}" != "unset" ; then
 365     OPENH323DIR="${PWLIBDIR}/../openh323"
 366     AC_CHECK_FILE(${OPENH323DIR}/include/h323.h, , OPENH323_INCDIR="${PWLIB_INCDIR}/openh323"; OPENH323_LIBDIR="${PWLIB_LIBDIR}")
 367   else
 368     AC_CHECK_FILE(${HOME}/openh323/include/h323.h, HAS_OPENH323=1, )
 369     if test "${HAS_OPENH323:-unset}" != "unset" ; then
 370       OPENH323DIR="${HOME}/openh323"
 371     else
 372       AC_CHECK_FILE(/usr/local/include/openh323/h323.h, HAS_OPENH323=1, )
 373       if test "${HAS_OPENH323:-unset}" != "unset" ; then
 374         OPENH323DIR="/usr/local/share/openh323"
 375         OPENH323_INCDIR="/usr/local/include/openh323"
 376         if test "x$LIB64" != "x"; then
 377           OPENH323_LIBDIR="/usr/local/lib64"
 378         else
 379           OPENH323_LIBDIR="/usr/local/lib"
 380         fi
 381       else
 382         AC_CHECK_FILE(/usr/include/openh323/h323.h, HAS_OPENH323=1, )
 383         if test "${HAS_OPENH323:-unset}" != "unset" ; then
 384           OPENH323DIR="/usr/share/openh323"
 385           OPENH323_INCDIR="/usr/include/openh323"
 386           if test "x$LIB64" != "x"; then
 387             OPENH323_LIBDIR="/usr/lib64"
 388           else
 389             OPENH323_LIBDIR="/usr/lib"
 390           fi
 391         fi
 392       fi
 393     fi
 394   fi
 395 fi
 396
 397 if test "${HAS_OPENH323:-unset}" != "unset" ; then
 398   if test "${OPENH323_INCDIR:-unset}" = "unset"; then
 399     OPENH323_INCDIR="${OPENH323DIR}/include"
 400   fi
 401   if test "${OPENH323_LIBDIR:-unset}" = "unset"; then
 402     OPENH323_LIBDIR="${OPENH323DIR}/lib"
 403   fi
 404
 405   AC_SUBST([OPENH323DIR])
 406   AC_SUBST([OPENH323_INCDIR])
 407   AC_SUBST([OPENH323_LIBDIR])
 408 fi
 409 ])
 410
 411
 412 AC_DEFUN(
 413 [AST_CHECK_PWLIB_VERSION], [
 414         if test "${HAS_$2:-unset}" != "unset"; then
 415                 $2_VERSION=`grep "$2_VERSION" ${$2_INCDIR}/$3 | cut -f2 -d ' ' | sed -e 's/"//g'`
 416                 $2_MAJOR_VERSION=`echo ${$2_VERSION} | cut -f1 -d.`
 417                 $2_MINOR_VERSION=`echo ${$2_VERSION} | cut -f2 -d.`
 418                 $2_BUILD_NUMBER=`echo ${$2_VERSION} | cut -f3 -d.`
 419                 let $2_VER=${$2_MAJOR_VERSION}*10000+${$2_MINOR_VERSION}*100+${$2_BUILD_NUMBER}
 420                 let $2_REQ=$4*10000+$5*100+$6
 421
 422                 AC_MSG_CHECKING(if $1 version ${$2_VERSION} is compatible with chan_h323)
 423                 if test ${$2_VER} -lt ${$2_REQ}; then
 424                         AC_MSG_RESULT(no)
 425                         unset HAS_$2
 426                 else
 427                         AC_MSG_RESULT(yes)
 428                 fi
 429         fi
 430 ])
 431
 432
 433 AC_DEFUN(
 434 [AST_CHECK_PWLIB_BUILD], [
 435         if test "${HAS_$2:-unset}" != "unset"; then
 436            AC_MSG_CHECKING($1 installation validity)
 437
 438            saved_cppflags="${CPPFLAGS}"
 439            saved_libs="${LIBS}"
 440            LIBS="${LIBS} -L${$2_LIBDIR} -l${PLATFORM_$2} $7"
 441            CPPFLAGS="${CPPFLAGS} -I${$2_INCDIR} $6"
 442
 443            AC_LANG_PUSH([C++])
 444
 445            AC_LINK_IFELSE(
 446                 [AC_LANG_PROGRAM([$4],[$5])],
 447                 [       AC_MSG_RESULT(yes)
 448                         ac_cv_lib_$2="yes"
 449                 ],
 450                 [       AC_MSG_RESULT(no)
 451                         ac_cv_lib_$2="no"
 452                 ]
 453                 )
 454
 455            AC_LANG_POP([C++])
 456
 457            LIBS="${saved_libs}"
 458            CPPFLAGS="${saved_cppflags}"
 459
 460            if test "${ac_cv_lib_$2}" = "yes"; then
 461               if test "${$2_LIBDIR}" != "" -a "${$2_LIBDIR}" != "/usr/lib"; then
 462                  $2_LIB="-L${$2_LIBDIR} -l${PLATFORM_$2}"
 463               else
 464                  $2_LIB="-l${PLATFORM_$2}"
 465               fi
 466               if test "${$2_INCDIR}" != "" -a "${$2_INCDIR}" != "/usr/include"; then
 467                  $2_INCLUDE="-I${$2_INCDIR}"
 468               fi
 469                   PBX_$2=1
 470                   AC_DEFINE([HAVE_$2], 1, [$3])
 471            fi
 472         fi
 473 ])
 474
 475 AC_DEFUN(
 476 [AST_CHECK_OPENH323_BUILD], [
 477         if test "${HAS_OPENH323:-unset}" != "unset"; then
 478                 AC_MSG_CHECKING(OpenH323 build option)
 479                 OPENH323_SUFFIX=
 480                 files=`ls -l ${OPENH323_LIBDIR}/libh323_${PWLIB_PLATFORM}_*.so*`
 481                 libfile=
 482                 if test -n "$files"; then
 483                         for f in $files; do
 484                                 if test -f $f -a ! -L $f; then
 485                                         libfile=`basename $f`
 486                                         break;
 487                                 fi
 488                         done
 489                 fi
 490                 if test "${libfile:-unset}" != "unset"; then
 491                         OPENH323_SUFFIX=`eval "echo ${libfile} | sed -e 's/libh323_${PWLIB_PLATFORM}_\(@<:@^.@:>@*\)\..*/\1/'"`
 492                 fi
 493                 case "${OPENH323_SUFFIX}" in
 494                         n)
 495                                 OPENH323_BUILD="notrace";;
 496                         r)
 497                                 OPENH323_BUILD="opt";;
 498                         d)
 499                                 OPENH323_BUILD="debug";;
 500                         *)
 501                                 OPENH323_BUILD="notrace";;
 502                 esac
 503                 AC_MSG_RESULT(${OPENH323_BUILD})
 504
 505                 AC_SUBST([OPENH323_SUFFIX])
 506                 AC_SUBST([OPENH323_BUILD])
 507         fi
 508 ])
 509
 510
 511 # AST_FUNC_FORK
 512 # -------------
 513 AN_FUNCTION([fork],  [AST_FUNC_FORK])
 514 AN_FUNCTION([vfork], [AST_FUNC_FORK])
 515 AC_DEFUN([AST_FUNC_FORK],
 516 [AC_REQUIRE([AC_TYPE_PID_T])dnl
 517 AC_CHECK_HEADERS(vfork.h)
 518 AC_CHECK_FUNCS(fork vfork)
 519 if test "x$ac_cv_func_fork" = xyes; then
 520   _AST_FUNC_FORK
 521 else
 522   ac_cv_func_fork_works=$ac_cv_func_fork
 523 fi
 524 if test "x$ac_cv_func_fork_works" = xcross; then
 525   case $host in
 526     *-*-amigaos* | *-*-msdosdjgpp* | *-*-uclinux* )
 527       # Override, as these systems have only a dummy fork() stub
 528       ac_cv_func_fork_works=no
 529       ;;
 530     *)
 531       ac_cv_func_fork_works=yes
 532       ;;
 533   esac
 534   AC_MSG_WARN([result $ac_cv_func_fork_works guessed because of cross compilation])
 535 fi
 536 ac_cv_func_vfork_works=$ac_cv_func_vfork
 537 if test "x$ac_cv_func_vfork" = xyes; then
 538   _AC_FUNC_VFORK
 539 fi;
 540 if test "x$ac_cv_func_fork_works" = xcross; then
 541   ac_cv_func_vfork_works=$ac_cv_func_vfork
 542   AC_MSG_WARN([result $ac_cv_func_vfork_works guessed because of cross compilation])
 543 fi
 544
 545 if test "x$ac_cv_func_vfork_works" = xyes; then
 546   AC_DEFINE(HAVE_WORKING_VFORK, 1, [Define to 1 if `vfork' works.])
 547 else
 548   AC_DEFINE(vfork, fork, [Define as `fork' if `vfork' does not work.])
 549 fi
 550 if test "x$ac_cv_func_fork_works" = xyes; then
 551   AC_DEFINE(HAVE_WORKING_FORK, 1, [Define to 1 if `fork' works.])
 552 fi
 553 ])# AST_FUNC_FORK
 554
 555
 556 # _AST_FUNC_FORK
 557 # -------------
 558 AC_DEFUN([_AST_FUNC_FORK],
 559   [AC_CACHE_CHECK(for working fork, ac_cv_func_fork_works,
 560     [AC_RUN_IFELSE(
 561       [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
 562         [
 563           /* By Ruediger Kuhlmann. */
 564           return fork () < 0;
 565         ])],
 566       [ac_cv_func_fork_works=yes],
 567       [ac_cv_func_fork_works=no],
 568       [ac_cv_func_fork_works=cross])])]
 569 )# _AST_FUNC_FORK