1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_check_zlib.html
3 # ===========================================================================
11 # This macro searches for an installed zlib library. If nothing was
12 # specified when calling configure, it searches first in /usr/local and
13 # then in /usr, /opt/local and /sw. If the --with-zlib=DIR is specified,
14 # it will try to find it in DIR/include/zlib.h and DIR/lib/libz.a. If
15 # --without-zlib is specified, the library is not searched at all.
17 # If either the header file (zlib.h) or the library (libz) is not found,
18 # the configuration exits on error, asking for a valid zlib installation
19 # directory or --without-zlib.
21 # The macro defines the symbol HAVE_LIBZ if the library is found. You
22 # should use autoheader to include a definition for this symbol in a
23 # config.h file. Sample usage in a C/C++ source is as follows:
27 # #endif /* HAVE_LIBZ */
31 # Copyright (c) 2008 Loic Dachary <loic@senga.org>
32 # Copyright (c) 2010 Bastien Chevreux <bach@chevreux.org>
34 # This program is free software; you can redistribute it and/or modify it
35 # under the terms of the GNU General Public License as published by the
36 # Free Software Foundation; either version 2 of the License, or (at your
37 # option) any later version.
39 # This program is distributed in the hope that it will be useful, but
40 # WITHOUT ANY WARRANTY; without even the implied warranty of
41 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
42 # Public License for more details.
44 # You should have received a copy of the GNU General Public License along
45 # with this program. If not, see <http://www.gnu.org/licenses/>.
47 # As a special exception, the respective Autoconf Macro's copyright owner
48 # gives unlimited permission to copy, distribute and modify the configure
49 # scripts that are the output of Autoconf when processing the Macro. You
50 # need not follow the terms of the GNU General Public License when using
51 # or distributing such scripts, even though portions of the text of the
52 # Macro appear in them. The GNU General Public License (GPL) does govern
53 # all other use of the material that constitutes the Autoconf Macro.
55 # This special exception to the GPL applies to versions of the Autoconf
56 # Macro released by the Autoconf Archive. When you make and distribute a
57 # modified version of the Autoconf Macro, you may extend this special
58 # exception to the GPL to apply to your modified version as well.
62 AU_ALIAS([CHECK_ZLIB], [AX_CHECK_ZLIB])
63 AC_DEFUN([AX_CHECK_ZLIB],
67 [AC_MSG_CHECKING(if zlib is wanted)
69 [ --with-zlib=DIR root directory path of zlib installation [defaults to
70 /usr/local or /usr if not found in /usr/local]
71 --without-zlib to disable zlib usage completely],
72 [if test "$withval" != no ; then
73 zlib_places="/usr/local /usr /opt/local /sw"
77 zlib_places="$withval $zlib_places"
79 AC_MSG_WARN([Sorry, $withval does not exist, checking usual places])
87 # Locate zlib, if wanted
89 if test -n "${zlib_places}"
91 # check the user supplied or any other more or less 'standard' place:
92 # Most UNIX systems : /usr/local and /usr
93 # MacPorts / Fink on OSX : /opt/local respectively /sw
94 for ZLIB_HOME in ${zlib_places} ; do
95 if test -f "${ZLIB_HOME}/include/zlib.h"; then break; fi
99 # if zlib.h was nowhere to be found, give a notice and bail out
100 if test ! -n "${ZLIB_HOME}"; then
101 AC_MSG_ERROR(No zlib.h in any include directory of ${zlib_places}: either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib)
104 ZLIB_OLD_LDFLAGS=$LDFLAGS
105 ZLIB_OLD_CPPFLAGS=$LDFLAGS
106 LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
107 CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
110 AC_CHECK_LIB(z, inflateEnd, [zlib_cv_libz=yes], [zlib_cv_libz=no])
111 AC_CHECK_HEADER(zlib.h, [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
113 if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes"
116 # If both library and header were found, use them
118 AC_CHECK_LIB(z, inflateEnd)
119 AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
123 # If either header or library was not found, revert and bomb
125 AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
126 LDFLAGS="$ZLIB_OLD_LDFLAGS"
127 CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
128 AC_MSG_RESULT(failed)
129 AC_MSG_ERROR(either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib)