dnl -----------------------------------------------------------------
dnl apr_common.m4: APR's general-purpose autoconf macros
dnl

dnl APR_CONFIG_NICE(filename)
dnl
dnl Saves a snapshot of the configure command-line for later reuse
dnl
AC_DEFUN(APR_CONFIG_NICE,[
  rm -f $1
  cat >$1<<EOF
#! /bin/sh
#
# Created by configure

EOF
  if test -n "$CC"; then
    echo "CC=\"$CC\"; export CC" >> $1
  fi
  if test -n "$CFLAGS"; then
    echo "CFLAGS=\"$CFLAGS\"; export CFLAGS" >> $1
  fi
  if test -n "$CPPFLAGS"; then
    echo "CPPFLAGS=\"$CPPFLAGS\"; export CPPFLAGS" >> $1
  fi
  if test -n "$LDFLAGS"; then
    echo "LDFLAGS=\"$LDFLAGS\"; export LDFLAGS" >> $1
  fi
  if test -n "$LIBS"; then
    echo "LIBS=\"$LIBS\"; export LIBS" >> $1
  fi
  if test -n "$INCLUDES"; then
    echo "INCLUDES=\"$INCLUDES\"; export INCLUDES" >> $1
  fi
  if test -n "$NOTEST_CFLAGS"; then
    echo "NOTEST_CFLAGS=\"$NOTEST_CFLAGS\"; export NOTEST_CFLAGS" >> $1
  fi
  if test -n "$NOTEST_CPPFLAGS"; then
    echo "NOTEST_CPPFLAGS=\"$NOTEST_CPPFLAGS\"; export NOTEST_CPPFLAGS" >> $1
  fi
  if test -n "$NOTEST_LDFLAGS"; then
    echo "NOTEST_LDFLAGS=\"$NOTEST_LDFLAGS\"; export NOTEST_LDFLAGS" >> $1
  fi
  if test -n "$NOTEST_LIBS"; then
    echo "NOTEST_LIBS=\"$NOTEST_LIBS\"; export NOTEST_LIBS" >> $1
  fi

  for arg in [$]0 "[$]@"; do
    APR_EXPAND_VAR(arg, $arg)
    echo "\"[$]arg\" \\" >> $1
  done
  echo '"[$]@"' >> $1
  chmod +x $1
])dnl

dnl APR_MKDIR_P_CHECK(fallback-mkdir-p)
dnl checks whether mkdir -p works
AC_DEFUN(APR_MKDIR_P_CHECK,[
  AC_CACHE_CHECK(for working mkdir -p, ac_cv_mkdir_p,[
    test -d conftestdir && rm -rf conftestdir
    mkdir -p conftestdir/somedir >/dev/null 2>&1
    if test -d conftestdir/somedir; then
      ac_cv_mkdir_p=yes
    else
      ac_cv_mkdir_p=no
    fi
    rm -rf conftestdir
  ])
  if test "$ac_cv_mkdir_p" = "yes"; then
      mkdir_p="mkdir -p"
  else
      mkdir_p="$1"
  fi
])

dnl
dnl APR_SUBDIR_CONFIG(dir [, sub-package-cmdline-args, args-to-drop])
dnl
dnl dir: directory to find configure in
dnl sub-package-cmdline-args: arguments to add to the invocation (optional)
dnl args-to-drop: arguments to drop from the invocation (optional)
dnl
dnl Note: This macro relies on ac_configure_args being set properly.
dnl
dnl The args-to-drop argument is shoved into a case statement, so
dnl multiple arguments can be separated with a |.
dnl
dnl Note: Older versions of autoconf do not single-quote args, while 2.54+
dnl places quotes around every argument.  So, if you want to drop the
dnl argument called --enable-layout, you must pass the third argument as:
dnl [--enable-layout=*|\'--enable-layout=*]
dnl
dnl Trying to optimize this is left as an exercise to the reader who wants
dnl to put up with more autoconf craziness.  I give up.
dnl
AC_DEFUN(APR_SUBDIR_CONFIG, [
  # save our work to this point; this allows the sub-package to use it
  AC_CACHE_SAVE

  echo "configuring package in $1 now"
  ac_popdir=`pwd`
  apr_config_subdirs="$1"
  test -d $1 || $mkdir_p $1
  ac_abs_srcdir=`(cd $srcdir/$1 && pwd)`
  cd $1

changequote(, )dnl
      # A "../" for each directory in /$config_subdirs.
      ac_dots=`echo $apr_config_subdirs|sed -e 's%^\./%%' -e 's%[^/]$%&/%' -e 's%[^/]*/%../%g'`
changequote([, ])dnl

  # Make the cache file pathname absolute for the subdirs
  # required to correctly handle subdirs that might actually
  # be symlinks
  case "$cache_file" in
  /*) # already absolute
    ac_sub_cache_file=$cache_file ;;
  *)  # Was relative path.
    ac_sub_cache_file="$ac_popdir/$cache_file" ;;
  esac

  ifelse($3, [], [apr_configure_args=$ac_configure_args],[
  apr_configure_args=
  apr_sep=
  for apr_configure_arg in $ac_configure_args
  do
    case "$apr_configure_arg" in
      $3)
        continue ;;
    esac
    apr_configure_args="$apr_configure_args$apr_sep'$apr_configure_arg'"
    apr_sep=" "
  done
  ])

  dnl The eval makes quoting arguments work - specifically $2 where the
  dnl quoting mechanisms used is "" rather than [].
  dnl
  dnl We need to execute another shell because some autoconf/shell combinations
  dnl will choke after doing repeated APR_SUBDIR_CONFIG()s.  (Namely Solaris
  dnl and autoconf-2.54+)
  if eval $SHELL $ac_abs_srcdir/configure $apr_configure_args --cache-file=$ac_sub_cache_file --srcdir=$ac_abs_srcdir $2
  then :
    echo "$1 configured properly"
  else
    echo "configure failed for $1"
    exit 1
  fi

  cd $ac_popdir

  # grab any updates from the sub-package
  AC_CACHE_LOAD
])dnl

dnl
dnl APR_SAVE_THE_ENVIRONMENT(variable_name)
dnl
dnl Stores the variable (usually a Makefile macro) for later restoration
dnl
AC_DEFUN(APR_SAVE_THE_ENVIRONMENT,[
  apr_ste_save_$1="$$1"
])dnl

dnl
dnl APR_RESTORE_THE_ENVIRONMENT(variable_name, prefix_)
dnl
dnl Uses the previously saved variable content to figure out what configure
dnl has added to the variable, moving the new bits to prefix_variable_name
dnl and restoring the original variable contents.  This makes it possible
dnl for a user to override configure when it does something stupid.
dnl
AC_DEFUN(APR_RESTORE_THE_ENVIRONMENT,[
if test "x$apr_ste_save_$1" = "x"; then
  $2$1="$$1"
  $1=
else
  if test "x$apr_ste_save_$1" = "x$$1"; then
    $2$1=
  else
    $2$1=`echo $$1 | sed -e "s%${apr_ste_save_$1}%%"`
    $1="$apr_ste_save_$1"
  fi
fi
echo "  restoring $1 to \"$$1\""
echo "  setting $2$1 to \"$$2$1\""
AC_SUBST($2$1)
])dnl

dnl
dnl APR_SETIFNULL(variable, value)
dnl
dnl  Set variable iff it's currently null
dnl
AC_DEFUN(APR_SETIFNULL,[
  if test -z "$$1"; then
    echo "  setting $1 to \"$2\""
    $1="$2"
  fi
])dnl

dnl
dnl APR_SETVAR(variable, value)
dnl
dnl  Set variable no matter what
dnl
AC_DEFUN(APR_SETVAR,[
  echo "  forcing $1 to \"$2\""
  $1="$2"
])dnl

dnl
dnl APR_ADDTO(variable, value)
dnl
dnl  Add value to variable
dnl
AC_DEFUN(APR_ADDTO,[
  if test "x$$1" = "x"; then
    echo "  setting $1 to \"$2\""
    $1="$2"
  else
    apr_addto_bugger="$2"
    for i in $apr_addto_bugger; do
      apr_addto_duplicate="0"
      for j in $$1; do
        if test "x$i" = "x$j"; then
          apr_addto_duplicate="1"
          break
        fi
      done
      if test $apr_addto_duplicate = "0"; then
        echo "  adding \"$i\" to $1"
        $1="$$1 $i"
      fi
    done
  fi
])dnl

dnl
dnl APR_REMOVEFROM(variable, value)
dnl
dnl Remove a value from a variable
dnl
AC_DEFUN(APR_REMOVEFROM,[
  if test "x$$1" = "x$2"; then
    echo "  nulling $1"
    $1=""
  else
    apr_new_bugger=""
    apr_removed=0
    for i in $$1; do
      if test "x$i" != "x$2"; then
        apr_new_bugger="$apr_new_bugger $i"
      else
        apr_removed=1
      fi
    done
    if test $apr_removed = "1"; then
      echo "  removed \"$2\" from $1"
      $1=$apr_new_bugger
    fi
  fi
]) dnl

dnl
dnl APR_CHECK_DEFINE_FILES( symbol, header_file [header_file ...] )
dnl
AC_DEFUN(APR_CHECK_DEFINE_FILES,[
  AC_CACHE_CHECK([for $1 in $2],ac_cv_define_$1,[
    ac_cv_define_$1=no
    for curhdr in $2
    do
      AC_EGREP_CPP(YES_IS_DEFINED, [
#include <$curhdr>
#ifdef $1
YES_IS_DEFINED
#endif
      ], ac_cv_define_$1=yes)
    done
  ])
  if test "$ac_cv_define_$1" = "yes"; then
    AC_DEFINE(HAVE_$1, 1, [Define if $1 is defined])
  fi
])


dnl
dnl APR_CHECK_DEFINE(symbol, header_file)
dnl
AC_DEFUN(APR_CHECK_DEFINE,[
  AC_CACHE_CHECK([for $1 in $2],ac_cv_define_$1,[
    AC_EGREP_CPP(YES_IS_DEFINED, [
#include <$2>
#ifdef $1
YES_IS_DEFINED
#endif
    ], ac_cv_define_$1=yes, ac_cv_define_$1=no)
  ])
  if test "$ac_cv_define_$1" = "yes"; then
    AC_DEFINE(HAVE_$1, 1, [Define if $1 is defined in $2])
  fi
])

dnl
dnl APR_CHECK_APR_DEFINE( symbol )
dnl
AC_DEFUN(APR_CHECK_APR_DEFINE,[
apr_old_cppflags=$CPPFLAGS
CPPFLAGS="$CPPFLAGS $INCLUDES"
AC_EGREP_CPP(YES_IS_DEFINED, [
#include <apr.h>
#if $1
YES_IS_DEFINED
#endif
], ac_cv_define_$1=yes, ac_cv_define_$1=no)
CPPFLAGS=$apr_old_cppflags
])

dnl APR_CHECK_FILE(filename); set ac_cv_file_filename to
dnl "yes" if 'filename' is readable, else "no".
AC_DEFUN([APR_CHECK_FILE], [
dnl Pick a safe variable name
define([apr_cvname], ac_cv_file_[]translit([$1], [./+-], [__p_]))
AC_CACHE_CHECK([for $1], [apr_cvname],
[if test -r $1; then
   apr_cvname=yes
 else
   apr_cvname=no
 fi])
])

define(APR_IFALLYES,[dnl
ac_rc=yes
for ac_spec in $1; do
    ac_type=`echo "$ac_spec" | sed -e 's/:.*$//'`
    ac_item=`echo "$ac_spec" | sed -e 's/^.*://'`
    case $ac_type in
        header )
            ac_item=`echo "$ac_item" | sed 'y%./+-%__p_%'`
            ac_var="ac_cv_header_$ac_item"
            ;;
        file )
            ac_item=`echo "$ac_item" | sed 'y%./+-%__p_%'`
            ac_var="ac_cv_file_$ac_item"
            ;;
        func )   ac_var="ac_cv_func_$ac_item"   ;;
        struct ) ac_var="ac_cv_struct_$ac_item" ;;
        define ) ac_var="ac_cv_define_$ac_item" ;;
        custom ) ac_var="$ac_item" ;;
    esac
    eval "ac_val=\$$ac_var"
    if test ".$ac_val" != .yes; then
        ac_rc=no
        break
    fi
done
if test ".$ac_rc" = .yes; then
    :
    $2
else
    :
    $3
fi
])


define(APR_BEGIN_DECISION,[dnl
ac_decision_item='$1'
ac_decision_msg='FAILED'
ac_decision=''
])


define(APR_DECIDE,[dnl
ac_decision='$1'
ac_decision_msg='$2'
ac_decision_$1=yes
ac_decision_$1_msg='$2'
])


define(APR_DECISION_OVERRIDE,[dnl
    ac_decision=''
    for ac_item in $1; do
         eval "ac_decision_this=\$ac_decision_${ac_item}"
         if test ".$ac_decision_this" = .yes; then
             ac_decision=$ac_item
             eval "ac_decision_msg=\$ac_decision_${ac_item}_msg"
         fi
    done
])


define(APR_DECISION_FORCE,[dnl
ac_decision="$1"
eval "ac_decision_msg=\"\$ac_decision_${ac_decision}_msg\""
])


define(APR_END_DECISION,[dnl
if test ".$ac_decision" = .; then
    echo "[$]0:Error: decision on $ac_decision_item failed" 1>&2
    exit 1
else
    if test ".$ac_decision_msg" = .; then
        ac_decision_msg="$ac_decision"
    fi
    AC_DEFINE_UNQUOTED(${ac_decision_item})
    AC_MSG_RESULT([decision on $ac_decision_item... $ac_decision_msg])
fi
])


dnl
dnl APR_CHECK_SIZEOF_EXTENDED(INCLUDES, TYPE [, CROSS_SIZE])
dnl
dnl A variant of AC_CHECK_SIZEOF which allows the checking of
dnl sizes of non-builtin types
dnl
AC_DEFUN(APR_CHECK_SIZEOF_EXTENDED,
[changequote(<<,>>)dnl
dnl The name to #define
define(<<AC_TYPE_NAME>>, translit(sizeof_$2, [a-z *], [A-Z_P]))dnl
dnl The cache variable
define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$2, [ *],[<p>]))dnl
changequote([, ])dnl
AC_MSG_CHECKING(size of $2)
AC_CACHE_VAL(AC_CV_NAME,
[AC_TRY_RUN([#include <stdio.h>
$1
main()
{
  FILE *f=fopen("conftestval","w");
  if (!f) exit(1);
  fprintf(f, "%d\n", sizeof($2));
  exit(0);
}], AC_CV_NAME=`cat conftestval`, AC_CV_NAME=0, ifelse([$3],,,
AC_CV_NAME=$3))])dnl
AC_MSG_RESULT($AC_CV_NAME)
AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The size of ]$2)
undefine([AC_TYPE_NAME])dnl
undefine([AC_CV_NAME])dnl
])


dnl
dnl APR_TRY_COMPILE_NO_WARNING(INCLUDES, FUNCTION-BODY,
dnl             [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
dnl
dnl Tries a compile test with warnings activated so that the result
dnl is false if the code doesn't compile cleanly.
dnl
AC_DEFUN(APR_TRY_COMPILE_NO_WARNING,
[if test "x$CFLAGS_WARN" = "x"; then
  apr_tcnw_flags=""
else
  apr_tcnw_flags=$CFLAGS_WARN
fi
if test "$ac_cv_prog_gcc" = "yes"; then 
  apr_tcnw_flags="$apr_tcnw_flags -Werror"
fi
changequote(', ')
cat > conftest.$ac_ext <<EOTEST
#include "confdefs.h"
'$1'
int main(int argc, const char * const argv[]) {
'$2'
; return 0; }
EOTEST
changequote([, ])
if ${CC-cc} -c $CFLAGS $CPPFLAGS $apr_tcnw_flags conftest.$ac_ext 2>&AC_FD_CC ; then
  ifelse([$3], , :, [rm -rf conftest*
  $3])
else
  echo "configure: failed or warning program:" >&AC_FD_CC
  cat conftest.$ac_ext >&AC_FD_CC
  ifelse([$4], , , [rm -rf conftest*
  $4])
fi
rm -f conftest*
])dnl

dnl
dnl APR_CHECK_STRERROR_R_RC
dnl
dnl  Decide which style of retcode is used by this system's 
dnl  strerror_r().  It either returns int (0 for success, -1
dnl  for failure), or it returns a pointer to the error 
dnl  string.
dnl
dnl
AC_DEFUN(APR_CHECK_STRERROR_R_RC,[
AC_MSG_CHECKING(for type of return code from strerror_r)
AC_TRY_RUN([
#include <errno.h>
#include <string.h>
#include <stdio.h>
main()
{
  char buf[1024];
  if (strerror_r(ERANGE, buf, sizeof buf) < 1) {
    exit(0);
  }
  else {
    exit(1);
  }
}], [
    ac_cv_strerror_r_rc_int=yes ], [
    ac_cv_strerror_r_rc_int=no ], [
    ac_cv_strerror_r_rc_int=no ] )
if test "x$ac_cv_strerror_r_rc_int" = xyes; then
  AC_DEFINE(STRERROR_R_RC_INT, 1, [Define if strerror returns int])
  msg="int"
else
  msg="pointer"
fi
AC_MSG_RESULT([$msg])
] )
dnl
dnl APR_CHECK_CRYPT_R_STYLE
dnl
dnl  Decide which of a couple of flavors of crypt_r() is necessary for
dnl  this platform.
dnl
AC_DEFUN(APR_CHECK_CRYPT_R_STYLE,[
AC_CACHE_CHECK(style of crypt_r, ac_cv_crypt_r_style,[
dnl
ac_cv_crypt_r_style=none
dnl
AC_TRY_COMPILE([
#include <crypt.h>
],[
CRYPTD buffer;
crypt_r("passwd", "hash", &buffer);
], ac_cv_crypt_r_style=cryptd)
dnl
if test "$ac_cv_crypt_r_style" = "none"; then
AC_TRY_COMPILE([
#include <crypt.h>
],[
struct crypt_data buffer;
crypt_r("passwd", "hash", &buffer);
], ac_cv_crypt_r_style=struct_crypt_data)
fi
dnl
if test "$ac_cv_crypt_r_style" = "none"; then
dnl same as previous test, but see if defining _GNU_SOURCE helps
AC_TRY_COMPILE([
#define _GNU_SOURCE
#include <crypt.h>
],[
struct crypt_data buffer;
crypt_r("passwd", "hash", &buffer);
], ac_cv_crypt_r_style=struct_crypt_data_gnu_source)
fi
dnl
])
if test "$ac_cv_crypt_r_style" = "cryptd"; then
    AC_DEFINE(CRYPT_R_CRYPTD, 1, [Define if crypt_r has uses CRYPTD])
fi
# if we don't combine these conditions, CRYPT_R_STRUCT_CRYPT_DATA
# will end up defined twice
if test "$ac_cv_crypt_r_style" = "struct_crypt_data" -o \
   "$ac_cv_crypt_r_style" = "struct_crypt_data_gnu_source"; then
    AC_DEFINE(CRYPT_R_STRUCT_CRYPT_DATA, 1, [Define if crypt_r uses struct crypt_data])
fi
if test "$ac_cv_crypt_r_style" = "struct_crypt_data_gnu_source"; then
    APR_ADDTO(CPPFLAGS, [-D_GNU_SOURCE])
fi
])

dnl
dnl APR_CHECK_DIRENT_INODE
dnl
dnl  Decide if d_fileno or d_ino are available in the dirent
dnl  structure on this platform.  Single UNIX Spec says d_ino,
dnl  BSD uses d_fileno.  Undef to find the real beast.
dnl
AC_DEFUN(APR_CHECK_DIRENT_INODE, [
AC_CACHE_CHECK([for inode member of struct dirent], apr_cv_dirent_inode, [
apr_cv_dirent_inode=no
AC_TRY_COMPILE([
#include <sys/types.h>
#include <dirent.h>
],[
#ifdef d_ino
#undef d_ino
#endif
struct dirent de; de.d_fileno;
], apr_cv_dirent_inode=d_fileno)
if test "$apr_cv_dirent_inode" = "no"; then
AC_TRY_COMPILE([
#include <sys/types.h>
#include <dirent.h>
],[
#ifdef d_fileno
#undef d_fileno
#endif
struct dirent de; de.d_ino;
], apr_cv_dirent_inode=d_ino)
fi
])
if test "$apr_cv_dirent_inode" != "no"; then
  AC_DEFINE_UNQUOTED(DIRENT_INODE, $apr_cv_dirent_inode)
fi
])

dnl
dnl APR_CHECK_DIRENT_TYPE
dnl
dnl  Decide if d_type is available in the dirent structure 
dnl  on this platform.  Not part of the Single UNIX Spec.
dnl  Note that this is worthless without DT_xxx macros, so
dnl  look for one while we are at it.
dnl
AC_DEFUN(APR_CHECK_DIRENT_TYPE,[
AC_CACHE_CHECK([for file type member of struct dirent], apr_cv_dirent_type,[
apr_cv_dirent_type=no
AC_TRY_COMPILE([
#include <sys/types.h>
#include <dirent.h>
],[
struct dirent de; de.d_type = DT_REG;
], apr_cv_dirent_type=d_type)
])
if test "$apr_cv_dirent_type" != "no"; then
  AC_DEFINE_UNQUOTED(DIRENT_TYPE, $apr_cv_dirent_type) 
fi
])

dnl the following is a newline, a space, a tab, and a backslash (the
dnl backslash is used by the shell to skip newlines, but m4 sees it;
dnl treat it like whitespace).
dnl WARNING: don't reindent these lines, or the space/tab will be lost!
define([apr_whitespace],[
 	\])

dnl
dnl APR_COMMA_ARGS(ARG1 ...)
dnl  convert the whitespace-separated arguments into comman-separated
dnl  arguments.
dnl
dnl APR_FOREACH(CODE-BLOCK, ARG1, ARG2, ...)
dnl  subsitute CODE-BLOCK for each ARG[i]. "eachval" will be set to ARG[i]
dnl  within each iteration.
dnl
changequote({,})
define({APR_COMMA_ARGS},{patsubst([$}{1],[[}apr_whitespace{]+],[,])})
define({APR_FOREACH},
  {ifelse($}{2,,,
          [define([eachval],
                  $}{2)$}{1[]APR_FOREACH([$}{1],
                                         builtin([shift],
                                                 builtin([shift], $}{@)))])})
changequote([,])

dnl APR_FLAG_HEADERS(HEADER-FILE ... [, FLAG-TO-SET ] [, "yes" ])
dnl  we set FLAG-TO-SET to 1 if we find HEADER-FILE, otherwise we set to 0
dnl  if FLAG-TO-SET is null, we automagically determine it's name
dnl  by changing all "/" to "_" in the HEADER-FILE and dropping
dnl  all "." and "-" chars. If the 3rd parameter is "yes" then instead of
dnl  setting to 1 or 0, we set FLAG-TO-SET to yes or no.
dnl  
AC_DEFUN(APR_FLAG_HEADERS,[
AC_CHECK_HEADERS($1)
for aprt_i in $1
do
    ac_safe=`echo "$aprt_i" | sed 'y%./+-%__p_%'`
    aprt_2=`echo "$aprt_i" | sed -e 's%/%_%g' -e 's/\.//g' -e 's/-//g'`
    if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
       eval "ifelse($2,,$aprt_2,$2)=ifelse($3,yes,yes,1)"
    else
       eval "ifelse($2,,$aprt_2,$2)=ifelse($3,yes,no,0)"
    fi
done
])

dnl APR_FLAG_FUNCS(FUNC ... [, FLAG-TO-SET] [, "yes" ])
dnl  if FLAG-TO-SET is null, we automagically determine it's name
dnl  prepending "have_" to the function name in FUNC, otherwise
dnl  we use what's provided as FLAG-TO-SET. If the 3rd parameter
dnl  is "yes" then instead of setting to 1 or 0, we set FLAG-TO-SET
dnl  to yes or no.
dnl
AC_DEFUN(APR_FLAG_FUNCS,[
AC_CHECK_FUNCS($1)
for aprt_j in $1
do
    aprt_3="have_$aprt_j"
    if eval "test \"`echo '$ac_cv_func_'$aprt_j`\" = yes"; then
       eval "ifelse($2,,$aprt_3,$2)=ifelse($3,yes,yes,1)"
    else
       eval "ifelse($2,,$aprt_3,$2)=ifelse($3,yes,no,0)"
    fi
done
])

dnl Iteratively interpolate the contents of the second argument
dnl until interpolation offers no new result. Then assign the
dnl final result to $1.
dnl
dnl Example:
dnl
dnl foo=1
dnl bar='${foo}/2'
dnl baz='${bar}/3'
dnl APR_EXPAND_VAR(fraz, $baz)
dnl   $fraz is now "1/2/3"
dnl 
AC_DEFUN(APR_EXPAND_VAR,[
ap_last=
ap_cur="$2"
while test "x${ap_cur}" != "x${ap_last}";
do
  ap_last="${ap_cur}"
  ap_cur=`eval "echo ${ap_cur}"`
done
$1="${ap_cur}"
])

dnl
dnl Removes the value of $3 from the string in $2, strips of any leading
dnl slashes, and returns the value in $1.
dnl
dnl Example:
dnl orig_path="${prefix}/bar"
dnl APR_PATH_RELATIVE(final_path, $orig_path, $prefix)
dnl    $final_path now contains "bar"
AC_DEFUN(APR_PATH_RELATIVE,[
ap_stripped=`echo $2 | sed -e "s#^$3##"`
# check if the stripping was successful
if test "x$2" != "x${ap_stripped}"; then
    # it was, so strip of any leading slashes
    $1="`echo ${ap_stripped} | sed -e 's#^/*##'`"
else
    # it wasn't so return the original
    $1="$2"
fi
])

dnl APR_HELP_STRING(LHS, RHS)
dnl Autoconf 2.50 can not handle substr correctly.  It does have 
dnl AC_HELP_STRING, so let's try to call it if we can.
dnl Note: this define must be on one line so that it can be properly returned
dnl as the help string.  When using this macro with a multi-line RHS, ensure
dnl that you surround the macro invocation with []s
AC_DEFUN(APR_HELP_STRING,[ifelse(regexp(AC_ACVERSION, 2\.1), -1, AC_HELP_STRING([$1],[$2]),[  ][$1] substr([                       ],len($1))[$2])])

dnl
dnl APR_LAYOUT(configlayout, layoutname [, extravars])
dnl
AC_DEFUN(APR_LAYOUT,[
  if test ! -f $srcdir/config.layout; then
    echo "** Error: Layout file $srcdir/config.layout not found"
    echo "** Error: Cannot use undefined layout '$LAYOUT'"
    exit 1
  fi
  pldconf=./config.pld
  changequote({,})
  sed -e "1s/[ 	]*<[lL]ayout[ 	]*$2[ 	]*>[ 	]*//;1t" \
      -e "1,/[ 	]*<[lL]ayout[ 	]*$2[ 	]*>[ 	]*/d" \
      -e '/[ 	]*<\/Layout>[ 	]*/,$d' \
      -e "s/^[ 	]*//g" \
      -e "s/:[ 	]*/=\'/g" \
      -e "s/[ 	]*$/'/g" \
      $1 > $pldconf
  layout_name=$2
  if test ! -s $pldconf; then
    echo "** Error: unable to find layout $layout_name"
    exit 1
  fi
  . $pldconf
  rm $pldconf
  for var in prefix exec_prefix bindir sbindir libexecdir mandir \
             sysconfdir datadir includedir localstatedir runtimedir \
             logfiledir libdir installbuilddir libsuffix $3; do
    eval "val=\"\$$var\""
    case $val in
      *+)
        val=`echo $val | sed -e 's;\+$;;'`
        eval "$var=\"\$val\""
        autosuffix=yes
        ;;
      *)
        autosuffix=no
        ;;
    esac
    val=`echo $val | sed -e 's:\(.\)/*$:\1:'`
    val=`echo $val | sed -e 's:[\$]\([a-z_]*\):${\1}:g'`
    if test "$autosuffix" = "yes"; then
      if echo $val | grep apache >/dev/null; then
        addtarget=no
      else
        addtarget=yes
      fi
      if test "$addtarget" = "yes"; then
        val="$val/apache2"
      fi
    fi
    eval "$var='$val'"
  done
  changequote([,])
])dnl

dnl
dnl APR_ENABLE_LAYOUT(default layout name [, extra vars])
dnl
AC_DEFUN(APR_ENABLE_LAYOUT,[
AC_ARG_ENABLE(layout,
[  --enable-layout=LAYOUT],[
  LAYOUT=$enableval
])

if test -z "$LAYOUT"; then
  LAYOUT="$1"
fi
APR_LAYOUT($srcdir/config.layout, $LAYOUT, $2)

AC_MSG_CHECKING(for chosen layout)
AC_MSG_RESULT($layout_name)
])


dnl
dnl APR_PARSE_ARGUMENTS
dnl a reimplementation of autoconf's argument parser,
dnl used here to allow us to co-exist layouts and argument based
dnl set ups.
AC_DEFUN(APR_PARSE_ARGUMENTS,[
ac_prev=
for ac_option
do
  # If the previous option needs an argument, assign it.
  if test -n "$ac_prev"; then
    eval "$ac_prev=\$ac_option"
    ac_prev=
    continue
  fi

  ac_optarg=`expr "x$ac_option" : 'x[[^=]]*=\(.*\)'`

  case $ac_option in

  -bindir | --bindir | --bindi | --bind | --bin | --bi)
    ac_prev=bindir ;;
  -bindir=* | --bindir=* | --bindi=* | --bind=* | --bin=* | --bi=*)
    bindir="$ac_optarg" ;;

  -datadir | --datadir | --datadi | --datad | --data | --dat | --da)
    ac_prev=datadir ;;
  -datadir=* | --datadir=* | --datadi=* | --datad=* | --data=* | --dat=* \
  | --da=*)
    datadir="$ac_optarg" ;;

  -exec-prefix | --exec_prefix | --exec-prefix | --exec-prefi \
  | --exec-pref | --exec-pre | --exec-pr | --exec-p | --exec- \
  | --exec | --exe | --ex)
    ac_prev=exec_prefix ;;
  -exec-prefix=* | --exec_prefix=* | --exec-prefix=* | --exec-prefi=* \
  | --exec-pref=* | --exec-pre=* | --exec-pr=* | --exec-p=* | --exec-=* \
  | --exec=* | --exe=* | --ex=*)
    exec_prefix="$ac_optarg" ;;

  -includedir | --includedir | --includedi | --included | --include \
  | --includ | --inclu | --incl | --inc)
    ac_prev=includedir ;;
  -includedir=* | --includedir=* | --includedi=* | --included=* | --include=* \
  | --includ=* | --inclu=* | --incl=* | --inc=*)
    includedir="$ac_optarg" ;;

  -infodir | --infodir | --infodi | --infod | --info | --inf)
    ac_prev=infodir ;;
  -infodir=* | --infodir=* | --infodi=* | --infod=* | --info=* | --inf=*)
    infodir="$ac_optarg" ;;

  -libdir | --libdir | --libdi | --libd)
    ac_prev=libdir ;;
  -libdir=* | --libdir=* | --libdi=* | --libd=*)
    libdir="$ac_optarg" ;;

  -libexecdir | --libexecdir | --libexecdi | --libexecd | --libexec \
  | --libexe | --libex | --libe)
    ac_prev=libexecdir ;;
  -libexecdir=* | --libexecdir=* | --libexecdi=* | --libexecd=* | --libexec=* \
  | --libexe=* | --libex=* | --libe=*)
    libexecdir="$ac_optarg" ;;

  -localstatedir | --localstatedir | --localstatedi | --localstated \
  | --localstate | --localstat | --localsta | --localst \
  | --locals | --local | --loca | --loc | --lo)
    ac_prev=localstatedir ;;
  -localstatedir=* | --localstatedir=* | --localstatedi=* | --localstated=* \
  | --localstate=* | --localstat=* | --localsta=* | --localst=* \
  | --locals=* | --local=* | --loca=* | --loc=* | --lo=*)
    localstatedir="$ac_optarg" ;;

  -mandir | --mandir | --mandi | --mand | --man | --ma | --m)
    ac_prev=mandir ;;
  -mandir=* | --mandir=* | --mandi=* | --mand=* | --man=* | --ma=* | --m=*)
    mandir="$ac_optarg" ;;

  -prefix | --prefix | --prefi | --pref | --pre | --pr | --p)
    ac_prev=prefix ;;
  -prefix=* | --prefix=* | --prefi=* | --pref=* | --pre=* | --pr=* | --p=*)
    prefix="$ac_optarg" ;;

  -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
    ac_prev=sbindir ;;
  -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
  | --sbi=* | --sb=*)
    sbindir="$ac_optarg" ;;

  -sharedstatedir | --sharedstatedir | --sharedstatedi \
  | --sharedstated | --sharedstate | --sharedstat | --sharedsta \
  | --sharedst | --shareds | --shared | --share | --shar \
  | --sha | --sh)
    ac_prev=sharedstatedir ;;
  -sharedstatedir=* | --sharedstatedir=* | --sharedstatedi=* \
  | --sharedstated=* | --sharedstate=* | --sharedstat=* | --sharedsta=* \
  | --sharedst=* | --shareds=* | --shared=* | --share=* | --shar=* \
  | --sha=* | --sh=*)
    sharedstatedir="$ac_optarg" ;;

  -sysconfdir | --sysconfdir | --sysconfdi | --sysconfd | --sysconf \
  | --syscon | --sysco | --sysc | --sys | --sy)
    ac_prev=sysconfdir ;;
  -sysconfdir=* | --sysconfdir=* | --sysconfdi=* | --sysconfd=* | --sysconf=* \
  | --syscon=* | --sysco=* | --sysc=* | --sys=* | --sy=*)
    sysconfdir="$ac_optarg" ;;

  esac
done

# Be sure to have absolute paths.
for ac_var in exec_prefix prefix
do
  eval ac_val=$`echo $ac_var`
  case $ac_val in
    [[\\/$]]* | ?:[[\\/]]* | NONE | '' ) ;;
    *)  AC_MSG_ERROR([expected an absolute path for --$ac_var: $ac_val]);;
  esac
done

])dnl

dnl
dnl APR_CHECK_DEPEND
dnl
dnl Determine what program we can use to generate .deps-style dependencies
dnl
AC_DEFUN(APR_CHECK_DEPEND,[
dnl Try to determine what depend program we can use
dnl All GCC-variants should have -MM.
dnl If not, then we can check on those, too.
if test "$GCC" = "yes"; then
  MKDEP='$(CC) -MM'
else
  rm -f conftest.c
dnl <sys/types.h> should be available everywhere!
  cat > conftest.c <<EOF
#include <sys/types.h>
  int main() { return 0; }
EOF
  MKDEP="true"
  for i in "$CC -MM" "$CC -M" "$CPP -MM" "$CPP -M" "cpp -M"; do
    AC_MSG_CHECKING([if $i can create proper make dependencies])
    if $i conftest.c 2>/dev/null | grep 'conftest.o: conftest.c' >/dev/null; then
      MKDEP=$i
      AC_MSG_RESULT(yes)
      break;
    fi
    AC_MSG_RESULT(no)
  done
  rm -f conftest.c
fi

AC_SUBST(MKDEP)
])
