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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_check_zlib.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_ZLIB([action-if-found], [action-if-not-found])
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#
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# DESCRIPTION
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#
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# This macro searches for an installed zlib library. If nothing was
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# specified when calling configure, it searches first in /usr/local and
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# then in /usr, /opt/local and /sw. If the --with-zlib=DIR is specified,
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# it will try to find it in DIR/include/zlib.h and DIR/lib/libz.a. If
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# --without-zlib is specified, the library is not searched at all.
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#
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# If either the header file (zlib.h) or the library (libz) is not found,
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# shell commands 'action-if-not-found' is run. If 'action-if-not-found' is
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# not specified, the configuration exits on error, asking for a valid zlib
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# installation directory or --without-zlib.
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#
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# If both header file and library are found, shell commands
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# 'action-if-found' is run. If 'action-if-found' is not specified, the
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# default action appends '-I${ZLIB_HOME}/include' to CPFLAGS, appends
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# '-L$ZLIB_HOME}/lib' to LDFLAGS, prepends '-lz' to LIBS, and calls
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# AC_DEFINE(HAVE_LIBZ). You should use autoheader to include a definition
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# for this symbol in a config.h file. Sample usage in a C/C++ source is as
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# follows:
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#
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# #ifdef HAVE_LIBZ
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# #include <zlib.h>
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# #endif /* HAVE_LIBZ */
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#
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# LICENSE
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#
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# Copyright (c) 2008 Loic Dachary <loic@senga.org>
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# Copyright (c) 2010 Bastien Chevreux <bach@chevreux.org>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 14
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AU_ALIAS([CHECK_ZLIB], [AX_CHECK_ZLIB])
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AC_DEFUN([AX_CHECK_ZLIB],
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#
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# Handle user hints
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#
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[AC_MSG_CHECKING(if zlib is wanted)
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zlib_places="/usr/local /usr /opt/local /sw"
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AC_ARG_WITH([zlib],
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[ --with-zlib=DIR root directory path of zlib installation @<:@defaults to
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/usr/local or /usr if not found in /usr/local@:>@
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--without-zlib to disable zlib usage completely],
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[if test "$withval" != no ; then
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AC_MSG_RESULT(yes)
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if test -d "$withval"
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then
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zlib_places="$withval $zlib_places"
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else
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AC_MSG_WARN([Sorry, $withval does not exist, checking usual places])
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fi
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else
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zlib_places=
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AC_MSG_RESULT(no)
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fi],
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[AC_MSG_RESULT(yes)])
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#
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# Locate zlib, if wanted
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#
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if test -n "${zlib_places}"
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then
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# check the user supplied or any other more or less 'standard' place:
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# Most UNIX systems : /usr/local and /usr
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# MacPorts / Fink on OSX : /opt/local respectively /sw
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for ZLIB_HOME in ${zlib_places} ; do
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if test -f "${ZLIB_HOME}/include/zlib.h"; then break; fi
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ZLIB_HOME=""
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done
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ZLIB_OLD_LDFLAGS=$LDFLAGS
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ZLIB_OLD_CPPFLAGS=$CPPFLAGS
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if test -n "${ZLIB_HOME}"; then
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LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
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CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
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fi
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AC_LANG_SAVE
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AC_LANG_C
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AC_CHECK_LIB([z], [inflateEnd], [zlib_cv_libz=yes], [zlib_cv_libz=no])
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AC_CHECK_HEADER([zlib.h], [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
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AC_LANG_RESTORE
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if test "$zlib_cv_libz" = "yes" && test "$zlib_cv_zlib_h" = "yes"
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then
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#
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# If both library and header were found, action-if-found
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#
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m4_ifblank([$1],[
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CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
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LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
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LIBS="-lz $LIBS"
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AC_DEFINE([HAVE_LIBZ], [1],
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[Define to 1 if you have `z' library (-lz)])
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],[
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# Restore variables
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LDFLAGS="$ZLIB_OLD_LDFLAGS"
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CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
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$1
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])
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else
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#
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# If either header or library was not found, action-if-not-found
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#
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m4_default([$2],[
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AC_MSG_ERROR([either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib])
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])
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fi
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fi
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])
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