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Autoconf Macro: ax_require_one_func
</title>
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<h1>
ax_require_one_func
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AX_REQUIRE_ONE_FUNC (FUNCTION..., [ACTION-IF-ANY-FOUND],
[ACTION-IF-NONE-FOUND])</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
AX_REQUIRE_ONE_FUNC is a simple wrapper for AC_CHECK_FUNCS. It calls
AC_CHECK_FUNCS on the list of functions named in the first argument, then
invokes ACTION-IF-ANY-FOUND if at least one of the functions exists or
ACTION-IF-NONE-FOUND if none of the functions exist.
</p>
<p>
Here's an example:
</p>
<pre>
AX_REQUIRE_ONE_FUNC([posix_memalign memalign valloc], ,
[AC_MSG_ERROR([unable to allocate page-aligned memory])])
</pre>
</div>
<h2>
Author
</h2>
<p class="indent">
Scott Pakin <pakin@uiuc.edu>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-22
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AX_REQUIRE_ONE_FUNC],
[m4_define([ax_1func_cv], [AS_TR_SH(ax_cv_func_any_$1)])
AC_CACHE_VAL([ax_1func_cv],
[ax_1func_cv=no
AC_CHECK_FUNCS([$1], [ax_1func_cv="$ax_1func_cv $ac_func"])])
AS_IF([test "$ax_1func_cv" = "no"],
[$3],
[ax_1func_cv=`echo $ax_1func_cv | sed 's/^no //'`
$2])
])
</pre>
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