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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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<head>
<title>
Autoconf Macro: ax_ext_have_lib
</title>
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<body>
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<tbody>
<tr>
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<a href="http://autoconf-archive.cryp.to/ax_ext_have_lib.m4">Download M4
Source</a>
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<hr>
<h1>
ax_ext_have_lib
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AX_EXT_HAVE_LIB(<directories>, <library>,
<function>, <extra libraries>)</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
AX_EXT_HAVE_LIB is identical to AC_SEARCH_LIBS with the exception that will
add -L<directory> when looking, and use a different variable for each
directory.
</p>
<p>
Any required -L<directory> flags are added to LDFLAGS and located
libraies are added to LIBS
</p>
<p>
Some libraries are unlinkable without other extra libraries, which can be
specified in the 4th argument. The mysql client library needs -lz, for
example.
</p>
<p>
Example:
</p>
<pre>
AX_EXT_HAVE_LIB(/lib /usr/lib /usr/local/lib /usr/lib/mysql /usr/local/mysql/lib, mysqlclient, mysql_init, [-lz])
</pre>
<p>
which finds the mysql client library if succeds system when it tries with
-L/usr/lib/mysql then it adds -lmysqlclient to LIBS and -L/usr/lib/mysql to
LDFLAGS.
</p>
<p>
The test itself is based on the autoconf 2.53 version of AC_SEARCH_LIBS.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
dps@simpson.demon.co.uk
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2004-07-29
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AX_EXT_HAVE_LIB],
[
new_ldflags=${LDFLAGS}
new_libs=$LIBS
AC_CHECK_LIB([$2], $3, new_libs="-l$2"; ext_lib_found="yes", ext_lib_found="no")
for dir in $1
do
if test $ext_lib_found = no
then
ext_haslib_cvdir=`echo $dir | $as_tr_sh`
AC_CACHE_CHECK([for $2 library with -L$dir], [ext_cv${ext_haslib_cvdir}_haslib_$2],
[ext_func_search_save_LIBS=$LIBS
ext_func_save_ldflags=${LDFLAGS}
LIBS="-l$2 $4 ${ext_func_search_save_LIBS}"
LDFLAGS="-L$dir ${ext_func_save_ldflags}"
AC_TRY_LINK_FUNC([$3], [eval "ext_cv${ext_haslib_cvdir}_haslib_$2"="yes"],
[eval "ext_cv${ext_haslib_cvdir}_haslib_$2"="no"])
LIBS=$ext_func_search_save_LIBS
LDFLAGS=$ext_func_save_ldflags
])
if eval `echo 'test x${'ext_cv${ext_haslib_cvdir}_haslib_$2'}' = "xyes"`; then
new_libs="-l$2 ${new_libs}"
new_ldflags="-L${dir} ${new_ldflags}"
ext_lib_found="yes"
fi
fi
done
LIBS=$new_libs
LDFLAGS=$new_ldflags
])
</pre>
</div>
</body>
</html>
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