acgeneral.m4

创建一个符合iso-9660标准的iso文件系统

dnl AC_CONFIG_AUX_DIR(DIR)
AC_DEFUN(AC_CONFIG_AUX_DIR,
[AC_CONFIG_AUX_DIRS($1 $srcdir/$1)])

dnl The default is `$srcdir' or `$srcdir/..' or `$srcdir/../..'.
dnl There's no need to call this macro explicitly; just AC_REQUIRE it.
AC_DEFUN(AC_CONFIG_AUX_DIR_DEFAULT,
[AC_CONFIG_AUX_DIRS($srcdir $srcdir/.. $srcdir/../..)])

dnl Internal subroutine.
dnl Search for the configuration auxiliary files in directory list $1.
dnl We look only for install-sh, so users of AC_PROG_INSTALL
dnl do not automatically need to distribute the other auxiliary files.
dnl AC_CONFIG_AUX_DIRS(DIR ...)
AC_DEFUN(AC_CONFIG_AUX_DIRS,
[ac_aux_dir=
for ac_dir in $1; do
  if test -f $ac_dir/install-sh; then
    ac_aux_dir=$ac_dir
    ac_install_sh="$ac_aux_dir/install-sh -c"
    break
  elif test -f $ac_dir/install.sh; then
    ac_aux_dir=$ac_dir
    ac_install_sh="$ac_aux_dir/install.sh -c"
    break
  fi
done
if test -z "$ac_aux_dir"; then
  AC_MSG_ERROR([can not find install-sh or install.sh in $1])
fi
ac_config_guess=$ac_aux_dir/config.guess
ac_config_sub=$ac_aux_dir/config.sub
ac_configure=$ac_aux_dir/configure # This should be Cygnus configure.
AC_PROVIDE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
])

dnl Canonicalize the host, target, and build system types.
AC_DEFUN(AC_CANONICAL_SYSTEM,
[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
AC_BEFORE([$0], [AC_ARG_PROGRAM])
# Do some error checking and defaulting for the host and target type.
# The inputs are:
#    configure --host=HOST --target=TARGET --build=BUILD NONOPT
#
# The rules are:
# 1. You are not allowed to specify --host, --target, and nonopt at the
#    same time.
# 2. Host defaults to nonopt.
# 3. If nonopt is not specified, then host defaults to the current host,
#    as determined by config.guess.
# 4. Target and build default to nonopt.
# 5. If nonopt is not specified, then target and build default to host.

# The aliases save the names the user supplied, while $host etc.
# will get canonicalized.
case $host---$target---$nonopt in
NONE---*---* | *---NONE---* | *---*---NONE) ;;
*) AC_MSG_ERROR(can only configure for one host and one target at a time) ;;
esac

AC_CANONICAL_HOST
AC_CANONICAL_TARGET
AC_CANONICAL_BUILD
test "$host_alias" != "$target_alias" &&
  test "$program_prefix$program_suffix$program_transform_name" = \
    NONENONEs,x,x, &&
  program_prefix=${target_alias}-
])

dnl Subroutines of AC_CANONICAL_SYSTEM.

AC_DEFUN(AC_CANONICAL_HOST,
[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl

# Make sure we can run config.sub.
if ${CONFIG_SHELL-/bin/sh} $ac_config_sub sun4 >/dev/null 2>&1; then :
else AC_MSG_ERROR(can not run $ac_config_sub)
fi

AC_MSG_CHECKING(host system type)

dnl Set host_alias.
host_alias=$host
case "$host_alias" in
NONE)
  case $nonopt in
  NONE)
    if host_alias=`${CONFIG_SHELL-/bin/sh} $ac_config_guess`; then :
    else AC_MSG_ERROR(can not guess host type; you must specify one)
    fi ;;
  *) host_alias=$nonopt ;;
  esac ;;
esac

dnl Set the other host vars.
changequote(<<, >>)dnl
host=`${CONFIG_SHELL-/bin/sh} $ac_config_sub $host_alias`
host_cpu=`echo $host | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
host_vendor=`echo $host | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
host_os=`echo $host | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
changequote([, ])dnl
AC_MSG_RESULT($host)
AC_SUBST(host)dnl
AC_SUBST(host_alias)dnl
AC_SUBST(host_cpu)dnl
AC_SUBST(host_vendor)dnl
AC_SUBST(host_os)dnl
])

dnl Internal use only.
AC_DEFUN(AC_CANONICAL_TARGET,
[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
AC_MSG_CHECKING(target system type)

dnl Set target_alias.
target_alias=$target
case "$target_alias" in
NONE)
  case $nonopt in
  NONE) target_alias=$host_alias ;;
  *) target_alias=$nonopt ;;
  esac ;;
esac

dnl Set the other target vars.
changequote(<<, >>)dnl
target=`${CONFIG_SHELL-/bin/sh} $ac_config_sub $target_alias`
target_cpu=`echo $target | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
target_vendor=`echo $target | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
target_os=`echo $target | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
changequote([, ])dnl
AC_MSG_RESULT($target)
AC_SUBST(target)dnl
AC_SUBST(target_alias)dnl
AC_SUBST(target_cpu)dnl
AC_SUBST(target_vendor)dnl
AC_SUBST(target_os)dnl
])

dnl Internal use only.
AC_DEFUN(AC_CANONICAL_BUILD,
[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
AC_MSG_CHECKING(build system type)

dnl Set build_alias.
build_alias=$build
case "$build_alias" in
NONE)
  case $nonopt in
  NONE) build_alias=$host_alias ;;
  *) build_alias=$nonopt ;;
  esac ;;
esac

dnl Set the other build vars.
changequote(<<, >>)dnl
build=`${CONFIG_SHELL-/bin/sh} $ac_config_sub $build_alias`
build_cpu=`echo $build | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\1/'`
build_vendor=`echo $build | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\2/'`
build_os=`echo $build | sed 's/^\([^-]*\)-\([^-]*\)-\(.*\)$/\3/'`
changequote([, ])dnl
AC_MSG_RESULT($build)
AC_SUBST(build)dnl
AC_SUBST(build_alias)dnl
AC_SUBST(build_cpu)dnl
AC_SUBST(build_vendor)dnl
AC_SUBST(build_os)dnl
])


dnl AC_VALIDATE_CACHED_SYSTEM_TUPLE[(cmd)]
dnl if the cache file is inconsistent with the current host,
dnl target and build system types, execute CMD or print a default
dnl error message.
AC_DEFUN(AC_VALIDATE_CACHED_SYSTEM_TUPLE, [
  AC_REQUIRE([AC_CANONICAL_SYSTEM])
  AC_MSG_CHECKING([cached system tuple])
  if { test x"${ac_cv_host_system_type+set}" = x"set" &&
       test x"$ac_cv_host_system_type" != x"$host"; } ||
     { test x"${ac_cv_build_system_type+set}" = x"set" &&
       test x"$ac_cv_build_system_type" != x"$build"; } ||
     { test x"${ac_cv_target_system_type+set}" = x"set" &&
       test x"$ac_cv_target_system_type" != x"$target"; }; then
      AC_MSG_RESULT([different])
      ifelse($#, 1, [$1],
        [AC_MSG_ERROR([remove config.cache and re-run configure])])
  else
    AC_MSG_RESULT(ok)
  fi
  ac_cv_host_system_type="$host"
  ac_cv_build_system_type="$build"
  ac_cv_target_system_type="$target"
])


dnl ### Caching test results


dnl Look for site or system specific initialization scripts.
dnl AC_SITE_LOAD()
define(AC_SITE_LOAD,
[# Prefer explicitly selected file to automatically selected ones.
if test -z "$CONFIG_SITE"; then
  if test "x$prefix" != xNONE; then
    CONFIG_SITE="$prefix/share/config.site $prefix/etc/config.site"
  else
    CONFIG_SITE="$ac_default_prefix/share/config.site $ac_default_prefix/etc/config.site"
  fi
fi
for ac_site_file in $CONFIG_SITE; do
  if test -r "$ac_site_file"; then
    echo "loading site script $ac_site_file"
    . "$ac_site_file"
  fi
done
])

dnl AC_CACHE_LOAD()
define(AC_CACHE_LOAD,
[if test -r "$cache_file"; then
  echo "loading cache $cache_file"
  . $cache_file
else
  echo "creating cache $cache_file"
  > $cache_file
fi
])

dnl AC_CACHE_SAVE()
define(AC_CACHE_SAVE,
[cat > confcache <<\EOF
# This file is a shell script that caches the results of configure
# tests run on this system so they can be shared between configure
# scripts and configure runs.  It is not useful on other systems.
# If it contains results you don't want to keep, you may remove or edit it.
#
# By default, configure uses ./config.cache as the cache file,
# creating it if it does not exist already.  You can give configure
# the --cache-file=FILE option to use a different cache file; that is
# what configure does when it calls configure scripts in
# subdirectories, so they share the cache.
# Giving --cache-file=/dev/null disables caching, for debugging configure.
# config.status only pays attention to the cache file if you give it the
# --recheck option to rerun configure.
#
EOF
dnl Allow a site initialization script to override cache values.
# The following way of writing the cache mishandles newlines in values,
# but we know of no workaround that is simple, portable, and efficient.
# So, don't put newlines in cache variables' values.
# Ultrix sh set writes to stderr and can't be redirected directly,
# and sets the high bit in the cache file unless we assign to the vars.
changequote(, )dnl
(set) 2>&1 |
  case `(ac_space=' '; set | grep ac_space) 2>&1` in
  *ac_space=\ *)
    # `set' does not quote correctly, so add quotes (double-quote substitution
    # turns \\\\ into \\, and sed turns \\ into \).
    sed -n \
      -e "s/'/'\\\\''/g" \
      -e "s/^\\([a-zA-Z0-9_]*_cv_[a-zA-Z0-9_]*\\)=\\(.*\\)/\\1=\${\\1='\\2'}/p"
    ;;
  *)
    # `set' quotes correctly as required by POSIX, so do not add quotes.
    sed -n -e 's/^\([a-zA-Z0-9_]*_cv_[a-zA-Z0-9_]*\)=\(.*\)/\1=${\1=\2}/p'
    ;;
  esac >> confcache
changequote([, ])dnl
if cmp -s $cache_file confcache; then
  :
else
  if test -w $cache_file; then
    echo "updating cache $cache_file"
    cat confcache > $cache_file
  else
    echo "not updating unwritable cache $cache_file"
  fi
fi
rm -f confcache
])

dnl The name of shell var CACHE-ID must contain `_cv_' in order to get saved.
dnl AC_CACHE_VAL(CACHE-ID, COMMANDS-TO-SET-IT)
define(AC_CACHE_VAL,
[dnl We used to use the below line, but it fails if the 1st arg is a
dnl shell variable, so we need the eval.
dnl if test "${$1+set}" = set; then
dnl the '' avoids an AIX 4.1 sh bug ("invalid expansion").
if eval "test \"`echo '$''{'$1'+set}'`\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&AC_FD_MSG
else
  $2
fi
])

dnl AC_CACHE_CHECK(MESSAGE, CACHE-ID, COMMANDS)
define(AC_CACHE_CHECK,
[AC_MSG_CHECKING([$1])
AC_CACHE_VAL([$2], [$3])
AC_MSG_RESULT([$]$2)])


dnl ### Defining symbols


dnl Set VARIABLE to VALUE, verbatim, or 1.
dnl AC_DEFINE(VARIABLE [, VALUE])
define(AC_DEFINE,
[cat >> confdefs.h <<\EOF
[#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
EOF
])

dnl Similar, but perform shell substitutions $ ` \ once on VALUE.
define(AC_DEFINE_UNQUOTED,
[cat >> confdefs.h <<EOF
[#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
EOF
])


dnl ### Setting output variables


dnl This macro protects VARIABLE from being diverted twice
dnl if this macro is called twice for it.
dnl AC_SUBST(VARIABLE)
define(AC_SUBST,
[ifdef([AC_SUBST_$1], ,
[define([AC_SUBST_$1], )dnl
AC_DIVERT_PUSH(AC_DIVERSION_SED)dnl
s%@$1@%[$]$1%g
AC_DIVERT_POP()dnl
])])

dnl AC_SUBST_FILE(VARIABLE)
define(AC_SUBST_FILE,
[ifdef([AC_SUBST_$1], ,
[define([AC_SUBST_$1], )dnl
AC_DIVERT_PUSH(AC_DIVERSION_SED)dnl
/@$1@/r [$]$1
s%@$1@%%g
AC_DIVERT_POP()dnl
])])


dnl ### Printing messages


dnl AC_MSG_CHECKING(FEATURE-DESCRIPTION)
define(AC_MSG_CHECKING,
[echo $ac_n "checking $1""... $ac_c" 1>&AC_FD_MSG
echo "configure:__oline__: checking $1" >&AC_FD_CC])

dnl AC_CHECKING(FEATURE-DESCRIPTION)
define(AC_CHECKING,
[echo "checking $1" 1>&AC_FD_MSG
echo "configure:__oline__: checking $1" >&AC_FD_CC])

dnl AC_MSG_RESULT(RESULT-DESCRIPTION)
define(AC_MSG_RESULT,
[echo "$ac_t""$1" 1>&AC_FD_MSG])

dnl AC_VERBOSE(RESULT-DESCRIPTION)
define(AC_VERBOSE,
[AC_OBSOLETE([$0], [; instead use AC_MSG_RESULT])dnl
echo "	$1" 1>&AC_FD_MSG])

dnl AC_MSG_WARN(PROBLEM-DESCRIPTION)
define(AC_MSG_WARN,
[echo "configure: warning: $1" 1>&2])

dnl AC_MSG_ERROR(ERROR-DESCRIPTION)
define(AC_MSG_ERROR,
[{ echo "configure: error: $1" 1>&2; exit 1; }])


dnl ### Selecting which language to use for testing


dnl AC_LANG_C()
AC_DEFUN(AC_LANG_C,
[define([AC_LANG], [C])dnl
ac_ext=c
# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
ac_cpp='$CPP $CPPFLAGS'
ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&AC_FD_CC'
ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&AC_FD_CC'
cross_compiling=$ac_cv_prog_cc_cross
])

dnl AC_LANG_CPLUSPLUS()
AC_DEFUN(AC_LANG_CPLUSPLUS,
[define([AC_LANG], [CPLUSPLUS])dnl
ac_ext=C
# CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
ac_cpp='$CXXCPP $CPPFLAGS'
ac_compile='${CXX-g++} -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext 1>&AC_FD_CC'
ac_link='${CXX-g++} -o conftest${ac_exeext} $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&AC_FD_CC'
cross_compiling=$ac_cv_prog_cxx_cross
])

dnl AC_LANG_FORTRAN77()
AC_DEFUN(AC_LANG_FORTRAN77,
[define([AC_LANG], [FORTRAN77])dnl
ac_ext=f
ac_compile='${F77-f77} -c $FFLAGS conftest.$ac_ext 1>&AC_FD_CC'
ac_link='${F77-f77} -o conftest${ac_exeext} $FFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&AC_FD_CC'
cross_compiling=$ac_cv_prog_f77_cross
])

dnl Push the current language on a stack.
dnl AC_LANG_SAVE()
define(AC_LANG_SAVE,
[pushdef([AC_LANG_STACK], AC_LANG)])

dnl Restore the current language from the stack.
dnl AC_LANG_RESTORE()
pushdef([AC_LANG_RESTORE],
[ifelse(AC_LANG_STACK, [C], [AC_LANG_C],dnl
AC_LANG_STACK, [CPLUSPLUS], [AC_LANG_CPLUSPLUS],dnl
AC_LANG_STACK, [FORTRAN77], [AC_LANG_FORTRAN77])[]popdef([AC_LANG_STACK])])