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# ===========================================================================
# http://www.gnu.org/software/autoconf-archive/ax_check_zlib.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_ZLIB()
#
# DESCRIPTION
#
# This macro searches for an installed zlib library. If nothing was
# specified when calling configure, it searches first in /usr/local and
# then in /usr. If the --with-zlib=DIR is specified, it will try to find
# it in DIR/include/zlib.h and DIR/lib/libz.a. If --without-zlib is
# specified, the library is not searched at all.
#
# If either the header file (zlib.h) or the library (libz) is not found,
# the configuration exits on error, asking for a valid zlib installation
# directory or --without-zlib.
#
# The macro defines the symbol HAVE_LIBZ if the library is found. You
# should use autoheader to include a definition for this symbol in a
# config.h file. Sample usage in a C/C++ source is as follows:
#
# #ifdef HAVE_LIBZ
# #include <zlib.h>
# #endif /* HAVE_LIBZ */
#
# LICENSE
#
# Copyright (c) 2008 Loic Dachary <loic@senga.org>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 7
AU_ALIAS([CHECK_ZLIB], [AX_CHECK_ZLIB])
AC_DEFUN([AX_CHECK_ZLIB],
#
# Handle user hints
#
[AC_MSG_CHECKING(if zlib is wanted)
AC_ARG_WITH(zlib,
[ --with-zlib=DIR root directory path of zlib installation [defaults to
/usr/local or /usr if not found in /usr/local]
--without-zlib to disable zlib usage completely],
[if test "$withval" != no ; then
AC_MSG_RESULT(yes)
if test -d "$withval"
then
ZLIB_HOME="$withval"
else
AC_MSG_WARN([Sorry, $withval does not exist, checking usual places])
fi
else
AC_MSG_RESULT(no)
fi],
[AC_MSG_RESULT(yes)])
ZLIB_HOME=/usr/local
if test ! -f "${ZLIB_HOME}/include/zlib.h"
then
ZLIB_HOME=/usr
fi
#
# Locate zlib, if wanted
#
if test -n "${ZLIB_HOME}"
then
ZLIB_OLD_LDFLAGS=$LDFLAGS
ZLIB_OLD_CPPFLAGS=$LDFLAGS
LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
AC_LANG_SAVE
AC_LANG_C
AC_CHECK_LIB(z, inflateEnd, [zlib_cv_libz=yes], [zlib_cv_libz=no])
AC_CHECK_HEADER(zlib.h, [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
AC_LANG_RESTORE
if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes"
then
#
# If both library and header were found, use them
#
AC_CHECK_LIB(z, inflateEnd)
AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
AC_MSG_RESULT(ok)
ZLIB="-lz"
AC_SUBST(ZLIB)
else
#
# If either header or library was not found, revert and bomb
#
AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
LDFLAGS="$ZLIB_OLD_LDFLAGS"
CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
AC_MSG_RESULT(failed)
AC_MSG_ERROR(either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib)
fi
fi
])
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