1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_check_zlib.html
3 # ===========================================================================
7 # AX_CHECK_ZLIB([action-if-found], [action-if-not-found])
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 # shell commands 'action-if-not-found' is run. If 'action-if-not-found' is
19 # not specified, the configuration exits on error, asking for a valid zlib
20 # installation directory or --without-zlib.
22 # If both header file and library are found, shell commands
23 # 'action-if-found' is run. If 'action-if-found' is not specified, the
24 # default action appends '-I${ZLIB_HOME}/include' to CPFLAGS, appends
25 # '-L$ZLIB_HOME}/lib' to LDFLAGS, prepends '-lz' to LIBS, and calls
26 # AC_DEFINE(HAVE_LIBZ). You should use autoheader to include a definition
27 # for this symbol in a config.h file. Sample usage in a C/C++ source is as
32 # #endif /* HAVE_LIBZ */
36 # Copyright (c) 2008 Loic Dachary <loic@senga.org>
37 # Copyright (c) 2010 Bastien Chevreux <bach@chevreux.org>
39 # This program is free software; you can redistribute it and/or modify it
40 # under the terms of the GNU General Public License as published by the
41 # Free Software Foundation; either version 2 of the License, or (at your
42 # option) any later version.
44 # This program is distributed in the hope that it will be useful, but
45 # WITHOUT ANY WARRANTY; without even the implied warranty of
46 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
47 # Public License for more details.
49 # You should have received a copy of the GNU General Public License along
50 # with this program. If not, see <http://www.gnu.org/licenses/>.
52 # As a special exception, the respective Autoconf Macro's copyright owner
53 # gives unlimited permission to copy, distribute and modify the configure
54 # scripts that are the output of Autoconf when processing the Macro. You
55 # need not follow the terms of the GNU General Public License when using
56 # or distributing such scripts, even though portions of the text of the
57 # Macro appear in them. The GNU General Public License (GPL) does govern
58 # all other use of the material that constitutes the Autoconf Macro.
60 # This special exception to the GPL applies to versions of the Autoconf
61 # Macro released by the Autoconf Archive. When you make and distribute a
62 # modified version of the Autoconf Macro, you may extend this special
63 # exception to the GPL to apply to your modified version as well.
67 AU_ALIAS([CHECK_ZLIB], [AX_CHECK_ZLIB])
68 AC_DEFUN([AX_CHECK_ZLIB],
72 [AC_MSG_CHECKING(if zlib is wanted)
73 zlib_places="/usr/local /usr /opt/local /sw"
75 [ --with-zlib=DIR root directory path of zlib installation @<:@defaults to
76 /usr/local or /usr if not found in /usr/local@:>@
77 --without-zlib to disable zlib usage completely],
78 [if test "$withval" != no ; then
82 zlib_places="$withval $zlib_places"
84 AC_MSG_WARN([Sorry, $withval does not exist, checking usual places])
93 # Locate zlib, if wanted
95 if test -n "${zlib_places}"
97 # check the user supplied or any other more or less 'standard' place:
98 # Most UNIX systems : /usr/local and /usr
99 # MacPorts / Fink on OSX : /opt/local respectively /sw
100 for ZLIB_HOME in ${zlib_places} ; do
101 if test -f "${ZLIB_HOME}/include/zlib.h"; then break; fi
105 ZLIB_OLD_LDFLAGS=$LDFLAGS
106 ZLIB_OLD_CPPFLAGS=$CPPFLAGS
107 if test -n "${ZLIB_HOME}"; then
108 LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
109 CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
113 AC_CHECK_LIB([z], [inflateEnd], [zlib_cv_libz=yes], [zlib_cv_libz=no])
114 AC_CHECK_HEADER([zlib.h], [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
116 if test "$zlib_cv_libz" = "yes" && test "$zlib_cv_zlib_h" = "yes"
119 # If both library and header were found, action-if-found
122 CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
123 LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
125 AC_DEFINE([HAVE_LIBZ], [1],
126 [Define to 1 if you have `z' library (-lz)])
129 LDFLAGS="$ZLIB_OLD_LDFLAGS"
130 CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
135 # If either header or library was not found, action-if-not-found
138 AC_MSG_ERROR([either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib])