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# C A C H E . M 4
# BRL-CAD
#
# Copyright (c) 2005-2010 United States Government as represented by
# the U.S. Army Research Laboratory.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
###
#
# Changes:
#
# 2007-05-04 imported into bzflag and macro renamed with BZ prefix
#
###
#
# BZ_CONFIG_CACHE
#
# automatically enable and load the configure cache file if available
#
###
AC_DEFUN([BZ_CONFIG_CACHE], [
AC_MSG_CHECKING([whether a configure cache exists])
if test "x$cache_file" = "x/dev/null" ; then
configure_cache=ifelse([$1], , [config.cache.${host_os}], [$1])
CONFIG_CACHE=""
if test -f "$configure_cache"; then
if test "x`cat $configure_cache | grep ac_cv_env_CC_value`" != "xac_cv_env_CC_value=$CC" ; then
dnl if the compiler we're using now doesn't
dnl match the compiler used in the previous
dnl cached results, invalidate it.
AC_MSG_RESULT([found but compiler differs])
rm -f "$configure_cache"
elif test "x`cat $configure_cache | grep ac_cv_env_CPPFLAGS_value`" != "xac_cv_env_CPPFLAGS_value=$CPPFLAGS" ; then
dnl if the preprocessor flags we're using now
dnl doesn't match the flags used in the
dnl previous cached results, invalidate it.
AC_MSG_RESULT([found but preprocessor flags differ])
rm -f "$configure_cache"
else
dnl if the configure script has been modified
dnl since the last caching, assume it to be
dnl invalid.
last_modified="`ls -Lt $configure_cache configure`"
case "x$last_modified" in
xconfigure*)
AC_MSG_RESULT([found but out of date])
rm -f $configure_cache
;;
esac
fi
dnl if the cache still exists, load it
if test -f "$configure_cache" ; then
dnl go ahead and load the cache
AC_MSG_RESULT([found $configure_cache])
case $configure_cache in
[\\/]* | ?:[\\/]* )
. $configure_cache
;;
*)
. ./$configure_cache
;;
esac
fi
else
AC_MSG_RESULT([not found])
fi
dnl if we are on sgi, bash may choke on bad sed syntax in the cache
if test "x$host_os" != "xirix6.5" ; then
AC_MSG_NOTICE([*** Automatically caching to $configure_cache ***])
>$configure_cache
cache_file="$configure_cache"
CONFIG_CACHE="$cache_file"
else
AC_MSG_NOTICE([Automatic caching is unavailable on IRIX])
fi
AC_SUBST(CONFIG_CACHE)
else
AC_MSG_RESULT($cache_file)
fi
])
# Local Variables:
# mode: m4
# tab-width: 8
# standard-indent: 4
# indent-tabs-mode: t
# End:
# ex: shiftwidth=4 tabstop=8
|
