configure.in

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    pid_t_fmt='#define APR_PID_T_FMT "hd"'
elif test "$ac_cv_sizeof_pid_t" = "$ac_cv_sizeof_int"; then
    pid_t_fmt='#define APR_PID_T_FMT "d"'
elif test "$ac_cv_sizeof_pid_t" = "$ac_cv_sizeof_long"; then
    pid_t_fmt='#define APR_PID_T_FMT "ld"'
elif test "$ac_cv_sizeof_pid_t" = "$ac_cv_sizeof_long_long"; then
    pid_t_fmt='#define APR_PID_T_FMT APR_INT64_T_FMT'
else
    pid_t_fmt='#error Can not determine the proper size for pid_t'
fi

# Basically, we have tried to figure out the correct format strings
# for APR types which vary between platforms, but we don't always get
# it right.
case $host in
   s390*linux*)
       # uniquely, the 31-bit Linux/s390 uses "unsigned long int"
       # for size_t rather than "unsigned int":
       size_t_fmt="lu"
       ssize_t_fmt="ld"
       ;;
   *-os2*)
       size_t_fmt="lu"
       ;;
   *-solaris*)
       if test "$ac_cv_sizeof_long" = "8"; then
         pid_t_fmt='#define APR_PID_T_FMT "d"'
       else
         pid_t_fmt='#define APR_PID_T_FMT "ld"'
       fi
       ;;
   *aix4*|*aix5*)
       ssize_t_fmt="ld"
       size_t_fmt="lu"
       ;;
    *beos*)
        ssize_t_fmt="ld"
        size_t_fmt="ld"
        ;;
    *apple-darwin*)
        osver=`uname -r`
        case $osver in
           [[0-7]].*)
              ssize_t_fmt="d"
              ;;
           *)
              ssize_t_fmt="ld"
              ;;
        esac
        size_t_fmt="lu"
        ;;
esac

APR_CHECK_TYPES_COMPATIBLE(ssize_t, int, [ssize_t_fmt="d"])
APR_CHECK_TYPES_COMPATIBLE(ssize_t, long, [ssize_t_fmt="ld"])
APR_CHECK_TYPES_COMPATIBLE(size_t, unsigned int, [size_t_fmt="u"])
APR_CHECK_TYPES_COMPATIBLE(size_t, unsigned long, [size_t_fmt="lu"])

APR_CHECK_SIZEOF_EXTENDED([#include <sys/types.h>], ssize_t, 8)

AC_MSG_CHECKING([which format to use for apr_ssize_t])
if test -n "$ssize_t_fmt"; then
    AC_MSG_RESULT(%$ssize_t_fmt)
elif test "$ac_cv_sizeof_ssize_t" = "$ac_cv_sizeof_int"; then
    ssize_t_fmt="d"
    AC_MSG_RESULT(%d)
elif test "$ac_cv_sizeof_ssize_t" = "$ac_cv_sizeof_long"; then
    ssize_t_fmt="ld"
    AC_MSG_RESULT(%ld)
else
    AC_ERROR([could not determine the proper format for apr_ssize_t])
fi

ssize_t_fmt="#define APR_SSIZE_T_FMT \"$ssize_t_fmt\""

APR_CHECK_SIZEOF_EXTENDED([#include <stddef.h>], size_t, 8)

AC_MSG_CHECKING([which format to use for apr_size_t])
if test -n "$size_t_fmt"; then
    AC_MSG_RESULT(%$size_t_fmt)
elif test "$ac_cv_sizeof_size_t" = "$ac_cv_sizeof_int"; then
    size_t_fmt="d"
    AC_MSG_RESULT(%d)
elif test "$ac_cv_sizeof_size_t" = "$ac_cv_sizeof_long"; then
    size_t_fmt="ld"
    AC_MSG_RESULT(%ld)
else
    AC_ERROR([could not determine the proper format for apr_size_t])
fi

size_t_fmt="#define APR_SIZE_T_FMT \"$size_t_fmt\""

APR_CHECK_SIZEOF_EXTENDED([#include <sys/types.h>], off_t, 8)

if test "${ac_cv_sizeof_off_t}${apr_cv_use_lfs64}" = "4yes"; then
    # Enable LFS
    aprlfs=1
    AC_CHECK_FUNCS([mmap64 sendfile64 sendfilev64 mkstemp64 readdir64_r])
elif test "${ac_cv_sizeof_off_t}" != "${ac_cv_sizeof_size_t}"; then
    # unsure of using -gt above is as portable, can can't forsee where
    # off_t can legitimately be smaller than size_t
    aprlfs=1
else
    aprlfs=0     
fi

AC_MSG_CHECKING([which type to use for apr_off_t])
if test "${ac_cv_sizeof_off_t}${apr_cv_use_lfs64}" = "4yes"; then
    # LFS is go!
    off_t_fmt='#define APR_OFF_T_FMT APR_INT64_T_FMT'
    off_t_value='off64_t'
    off_t_strfn='apr_strtoi64'
elif test "${ac_cv_sizeof_off_t}x${ac_cv_sizeof_long}" = "4x4"; then
    # Special case: off_t may change size with _FILE_OFFSET_BITS
    # on 32-bit systems with LFS support.  To avoid compatibility
    # issues when other packages do define _FILE_OFFSET_BITS,
    # hard-code apr_off_t to long.
    off_t_value=long
    off_t_fmt='#define APR_OFF_T_FMT "ld"'
    off_t_strfn='strtol'
elif test "$ac_cv_type_off_t" = "yes"; then
    off_t_value=off_t
    # off_t is more commonly a long than an int; prefer that case
    # where int and long are the same size.
    if test "$ac_cv_sizeof_off_t" = "$ac_cv_sizeof_long"; then
        off_t_fmt='#define APR_OFF_T_FMT "ld"'
        off_t_strfn='strtol'
    elif test "$ac_cv_sizeof_off_t" = "$ac_cv_sizeof_int"; then
        off_t_fmt='#define APR_OFF_T_FMT "d"'
        off_t_strfn='strtoi'
    elif test "$ac_cv_sizeof_off_t" = "$ac_cv_sizeof_long_long"; then
        off_t_fmt='#define APR_OFF_T_FMT APR_INT64_T_FMT'
        off_t_strfn='apr_strtoi64'
    else
        AC_ERROR([could not determine the size of off_t])
    fi
else
   # Fallback on int
   off_t_value=apr_int32_t
   off_t_fmt=d
   off_t_strfn='strtoi'
fi
AC_MSG_RESULT($off_t_value)

# Regardless of whether _LARGEFILE64_SOURCE is used, on 32-bit
# platforms _FILE_OFFSET_BITS will affect the size of ino_t and hence
# the build-time ABI may be different from the apparent ABI when using
# APR with another package which *does* define _FILE_OFFSET_BITS.
# (Exactly as per the case above with off_t where LFS is *not* used)
#
# To be safe, hard-code apr_ino_t as 'unsigned long' iff that is
# exactly the size of ino_t here; otherwise use ino_t as existing
# releases did.  To be correct, apr_ino_t should have been made an
# ino64_t as apr_off_t is off64_t, but this can't be done now without
# breaking ABI.
ino_t_value=ino_t
if test "$ac_cv_sizeof_long" = "4"; then
    APR_CHECK_TYPES_COMPATIBLE(ino_t, unsigned long, 
                               ino_t_value="unsigned long")
fi
AC_MSG_NOTICE([using $ino_t_value for ino_t])

# Checks for endianness
AC_C_BIGENDIAN
if test $ac_cv_c_bigendian = yes; then
    bigendian=1
else
    bigendian=0
fi

APR_CHECK_SIZEOF_EXTENDED([#include <sys/types.h>
#include <sys/uio.h>],struct iovec,0)
if test "$ac_cv_sizeof_struct_iovec" = "0"; then
    have_iovec=0
else
    have_iovec=1
fi

AC_SUBST(voidp_size)
AC_SUBST(short_value)
AC_SUBST(int_value)
AC_SUBST(long_value)
AC_SUBST(int64_value)
AC_SUBST(off_t_value)
AC_SUBST(size_t_value)
AC_SUBST(ssize_t_value)
AC_SUBST(socklen_t_value)
AC_SUBST(int64_t_fmt) 
AC_SUBST(uint64_t_fmt) 
AC_SUBST(uint64_t_hex_fmt) 
AC_SUBST(ssize_t_fmt) 
AC_SUBST(size_t_fmt)
AC_SUBST(off_t_fmt) 
AC_SUBST(pid_t_fmt)
AC_SUBST(int64_literal) 
AC_SUBST(uint64_literal) 
AC_SUBST(stdint) 
AC_SUBST(bigendian)
AC_SUBST(aprlfs)
AC_SUBST(have_iovec)
AC_SUBST(ino_t_value)

dnl ----------------------------- Checking for string functions
AC_CHECK_FUNCS(strnicmp, have_strnicmp="1", have_strnicmp="0")
AC_CHECK_FUNCS(strncasecmp, have_strncasecmp="1", have_strncasecmp="0")
AC_CHECK_FUNCS(stricmp, have_stricmp="1", have_stricmp="0")
AC_CHECK_FUNCS(strcasecmp, have_strcasecmp="1", have_strcasecmp="0")
AC_CHECK_FUNCS(strdup, have_strdup="1", have_strdup="0")
AC_CHECK_FUNCS(strstr, have_strstr="1", have_strstr="0")
AC_CHECK_FUNCS(memchr, have_memchr="1", have_memchr="0")
AC_CHECK_FUNC($int64_strfn, have_int64_strfn="1", have_int64_strfn="0")

dnl ----------------------------- We have a fallback position
if test "$have_int64_strfn" = "0" && test "$int64_strfn" = "strtoll"; then
    int64_strfn="strtoq"
    AC_CHECK_FUNC(strtoq, [have_int64_strfn=1], [have_int64_strfn=0])
fi

if test "$have_int64_strfn" = "1"; then
  AC_DEFINE_UNQUOTED(APR_INT64_STRFN, [$int64_strfn],
      [Define as function which can be used for conversion of strings to apr_int64_t])
fi

AC_SUBST(have_strnicmp)
AC_SUBST(have_strncasecmp)
AC_SUBST(have_stricmp)
AC_SUBST(have_strcasecmp)
AC_SUBST(have_strdup)
AC_SUBST(have_strstr)
AC_SUBST(have_memchr)

if test "$off_t_strfn" = "apr_strtoi64" && test "$have_int64_strfn" = "1"; then
    off_t_strfn=$int64_strfn
fi
AC_DEFINE_UNQUOTED(APR_OFF_T_STRFN, [$off_t_strfn],
          [Define as function used for conversion of strings to apr_off_t])

dnl ----------------------------- Checking for DSO support
echo "${nl}Checking for DSO..."
AC_ARG_ENABLE(dso,
  [  --disable-dso           Disable DSO support ],
  [if test "x$enableval" = "xyes"; then
      dsotype=any
   else
      dsotype=$enableval
   fi
  ], [dsotype=any])

if test "$dsotype" = "any"; then
    if test "$dsotype" = "any"; then
      case $host in
        *darwin[[0-8]]\.*) 
          # Original Darwin, not for 9.0!:
          AC_CHECK_FUNC(NSLinkModule, [dsotype=dyld]);;
        *-hpux[[1-9]]\.*|*-hpux1[[01]]*)
          # shl is specific to hpux(?), and is suboptimal for 64 bit builds,
          # and most unlikely to be the choice of 12.x developers.
          AC_CHECK_LIB(dld, shl_load, [have_shl=1])
          if test "$ac_cv_sizeof_voidp$have_shl" = "41"; then
            dsotype=shl; APR_ADDTO(LIBS,-ldld)
          fi;;
        *mingw*|*-os2*)
          # several 'other's below probably belong up here.  If they always
          # use a platform implementation and shouldn't test the dlopen/dlfcn
          # features, then bring them up here.
          # But if they -should- optionally use dlfcn, and/or need the config
          # detection of dlopen/dlsym, do not move them up.
          dsotype=other ;;
      esac
    fi
    # Normal POSIX:
    if test "$dsotype" = "any"; then
      AC_CHECK_FUNC(dlopen, [dsotype=dlfcn])
    fi
    if test "$dsotype" = "any"; then
      AC_CHECK_LIB(dl, dlopen, [dsotype=dlfcn; APR_ADDTO(LIBS,-ldl)])
    fi
    if test "$dsotype" = "dlfcn"; then
        # ReliantUnix has dlopen() in libc but dlsym() in libdl :(
        AC_CHECK_FUNC(dlsym, [], 
          [AC_CHECK_LIB(dl, dlsym, 
             [APR_ADDTO(LIBS, -ldl)],
             [dsotype=any
              echo "Weird: dlopen() was found but dlsym() was not found!"])])
    fi
    if test "$dsotype" = "any"; then
      # BeOS:
      AC_CHECK_LIB(root, load_image, [dsotype=other])
    fi
    # Everything else:
    if test "$dsotype" = "any"; then
        case $host in
        *os390|*os400|*-aix*)
          # Some -aix5 will use dl, no hassles.  Keep that pattern here.
          dsotype=other ;;
        *-hpux*)
          if test "$have_shl" = "1"; then
            dsotype=shl; APR_ADDTO(LIBS,-ldld)
          fi;;
        esac
    fi
fi

if test "$dsotype" = "any"; then
    AC_MSG_ERROR([Could not detect suitable DSO implementation])
elif test "$dsotype" = "no"; then
    aprdso="0"
else
    case "$dsotype" in
    dlfcn) AC_DEFINE(DSO_USE_DLFCN, 1, [Define if DSO support uses dlfcn.h]);;
    shl)   AC_DEFINE(DSO_USE_SHL, 1, [Define if DSO support uses shl_load]);;
    dyld)  AC_DEFINE(DSO_USE_DYLD, 1, [Define if DSO support uses dyld.h]);;
    other) ;; # Use whatever is in dso/OSDIR
    *) AC_MSG_ERROR([Unknown DSO implementation "$dsotype"]);;
    esac
    aprdso="1"
    apr_modules="$apr_modules dso"
fi

AC_SUBST(aprdso)

dnl ----------------------------- Checking for Processes
echo "${nl}Checking for Processes..."

AC_CHECK_FUNCS(waitpid)

AC_ARG_ENABLE(other-child,
  [  --enable-other-child    Enable reliable child processes ],
  [ if test "$enableval" = "yes"; then
        oc="1"
    else
        oc="0"
    fi ],
  [ oc=1 ] ) 
  
AC_SUBST(oc) 

if test -z "$have_proc_invoked"; then
  have_proc_invoked="0"
fi

AC_SUBST(have_proc_invoked)

AC_MSG_CHECKING(for Variable Length Arrays)
APR_TRY_COMPILE_NO_WARNING([],
[
    int foo[argc];
    foo[0] = 0;
], vla_msg=yes, vla_msg=no )
AC_MSG_RESULT([$vla_msg])
if test "$vla_msg" = "yes"; then
    AC_DEFINE(HAVE_VLA, 1, [Define if C compiler supports VLA])
fi

AC_CACHE_CHECK(struct rlimit,ac_cv_struct_rlimit,[
AC_TRY_RUN([
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
main()
{
    struct rlimit limit;
    limit.rlim_cur = 0;
    limit.rlim_max = 0;
    exit(0);
}], [
    ac_cv_struct_rlimit=yes ], [
    ac_cv_struct_rlimit=no ], [
    ac_cv_struct_rlimit=no ] ) ] )
struct_rlimit=0
test "x$ac_cv_struct_rlimit" = xyes && struct_rlimit=1
AC_SUBST(struct_rlimit)

dnl ----------------------------- Checking for Locking Characteristics 
echo "${nl}Checking for Locking..."

AC_CHECK_FUNCS(semget semctl flock)
AC_CHECK_HEADERS(semaphore.h OS.h)
AC_SEARCH_LIBS(sem_open, rt)
AC_CHECK_FUNCS(sem_close sem_unlink sem_post sem_wait create_sem)

# Some systems return ENOSYS from sem_open.
AC_CACHE_CHECK(for working sem_open,ac_cv_func_sem_open,[
AC_TRY_RUN([
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <semaphore.h>
#ifndef SEM_FAILED
#define SEM_FAILED (-1)
#endif
main()
{
    sem_t *psem;
    const char *sem_name = "/apr_autoconf";

    psem = sem_open(sem_name, O_CREAT, 0644, 1);
    if (psem == (sem_t *)SEM_FAILED) {
	exit(1);
    }
    sem_close(psem);
    psem = sem_open(sem_name, O_CREAT | O_EXCL, 0644, 1);
    if (psem != (sem_t *)SEM_FAILED) {
        sem_close(psem);
        exit(1);
    }
    sem_unlink(sem_name);
    exit(0);
}], [ac_cv_func_sem_open=yes], [ac_cv_func_sem_open=no],
[ac_cv_func_sem_open=no])])

# It's stupid, but not all platforms have union semun, even those that need it.
AC_MSG_CHECKING(for union semun in sys/sem.h)
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
],[
union semun arg;
semctl(0, 0, 0, arg);
], [have_union_semun="1" union_semun=yes ]
msg=yes, [
have_union_semun="0"
msg=no ] )
AC_MSG_RESULT([$msg])
AC_SUBST(have_union_semun)

dnl Checks for libraries.
APR_CHECK_DEFINE(LOCK_EX, sys/file.h)
APR_CHECK_DEFINE(F_SETLK, fcntl.h)
APR_CHECK_DEFINE(SEM_UNDO, sys/sem.h)

# We are assuming that if the platform doesn't have POLLIN, it doesn't have
# any POLL definitions.
APR_CHECK_DEFINE_FILES(POLLIN, poll.h sys/poll.h)

if test "$threads" = "1"; then
    APR_CHECK_DEFINE(PTHREAD_PROCESS_SHARED, pthread.h)
    AC_CHECK_FUNCS(pthread_mutexattr_setpshared)
    # Some systems have setpshared and define PROCESS_SHARED, but don't 
    # really support PROCESS_SHARED locks.  So, we must validate that we 
    # can go through the steps without receiving some sort of system error.
    # Linux and older versions of AIX have this problem.
    APR_IFALLYES(header:pthread.h define:PTHREAD_PROCESS_SHARED func:pthread_mutexattr_setpshared, [
      AC_CACHE_CHECK([for working PROCESS_SHARED locks], apr_cv_process_shared_works, [
      AC_TRY_RUN([
#include <sys/types.h>
#include <pthread.h>
        int main()
        {