apr_common.m4

Apache 2.0.63 is the current stable version of the 2.0 series, and is recommended over any previous

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" = "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"; then
    AC_DEFINE(CRYPT_R_STRUCT_CRYPT_DATA, 1, [Define if crypt_r uses struct crypt_data])
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=
# Retrieve the command-line arguments.  The eval is needed because
# the arguments are quoted to preserve accuracy.
eval "set x $ac_configure_args"
shift
for ac_option
do
  # If the previous option needs an argument, assign it.
  if test -n "$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)
])

dnl
dnl APR_CHECK_TYPES_COMPATIBLE(TYPE-1, TYPE-2, [ACTION-IF-TRUE])
dnl
dnl Try to determine whether two types are the same. Only works
dnl for gcc and icc.
dnl
AC_DEFUN([APR_CHECK_TYPES_COMPATIBLE], [
define([apr_cvname], apr_cv_typematch_[]translit([$1], [ ], [_])_[]translit([$2], [ ], [_]))
AC_CACHE_CHECK([whether $1 and $2 are the same], apr_cvname, [
AC_TRY_COMPILE(AC_INCLUDES_DEFAULT, [
    int foo[0 - !__builtin_types_compatible_p($1, $2)];
], [apr_cvname=yes $3], [apr_cvname=no])])
])