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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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<title>
Autoconf Macro: check_zlib
</title>
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<a href="http://autoconf-archive.cryp.to/check_zlib.m4">Download M4
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<hr>
<h1>
check_zlib
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>CHECK_ZLIB()</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
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.
</p>
<p>
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.
</p>
<p>
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:
</p>
<pre>
#ifdef HAVE_LIBZ
#include <zlib.h>
#endif /* HAVE_LIBZ */
</pre>
</div>
<h2>
Author
</h2>
<p class="indent">
Loic Dachary <loic@senga.org>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2004-09-20
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([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, $withval does not exist, checking usual places])
fi
else
AC_MSG_RESULT(no)
fi])
ZLIB_HOME=/usr/local
if test ! -f "${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)
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
])
</pre>
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