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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
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<head>
<title>
Autoconf Macro: ax_check_define
</title>
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<a href="http://autoconf-archive.cryp.to/ax_check_define.m4">Download M4
Source</a>
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<hr>
<h1>
ax_check_define
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_CHECK_DEFINE([symbol], [ACTION-IF-FOUND],
[ACTION-IF-NOT])</code><br>
<code>AX_CHECK_DEFINE([includes],[symbol], [ACTION-IF-FOUND],
[ACTION-IF-NOT])</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
complements AC_CHECK_FUNC but it does not check for a function but for a
define to exist. Consider a usage like AC_CHECK_DEFINE(__STRICT_ANSI__,
CFLAGS="$CFLAGS -D_XOPEN_SOURCE=500")
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Guido Draheim <guidod@gmx.de>
</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([AC_CHECK_DEFINED],[
AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$1])dnl
AC_CACHE_CHECK([for $1 defined], ac_var,
AC_TRY_COMPILE(,[
#ifdef $1
int ok;
#else
choke me
#endif
],AS_VAR_SET(ac_var, yes),AS_VAR_SET(ac_var, no)))
AS_IF([test AS_VAR_GET(ac_var) != "no"], [$2], [$3])dnl
AS_VAR_POPDEF([ac_var])dnl
])
AC_DEFUN([AX_CHECK_DEFINED],[
AS_VAR_PUSHDEF([ac_var],[ac_cv_defined_$2])dnl
AC_CACHE_CHECK([for $1 defined], ac_var,
AC_TRY_COMPILE($1,[
#ifndef $2
int ok;
#else
choke me
#endif
],AS_VAR_SET(ac_var, yes),AS_VAR_SET(ac_var, no)))
AS_IF([test AS_VAR_GET(ac_var) != "no"], [$3], [$4])dnl
AS_VAR_POPDEF([ac_var])dnl
])
AC_DEFUN([AX_CHECK_FUNC],
[AS_VAR_PUSHDEF([ac_var], [ac_cv_func_$2])dnl
AC_CACHE_CHECK([for $2], ac_var,
dnl AC_LANG_FUNC_LINK_TRY
[AC_LINK_IFELSE([AC_LANG_PROGRAM([$1
#undef $2
char $2 ();],[
char (*f) () = $2;
return f != $2; ])],
[AS_VAR_SET(ac_var, yes)],
[AS_VAR_SET(ac_var, no)])])
AS_IF([test AS_VAR_GET(ac_var) = yes], [$3], [$4])dnl
AS_VAR_POPDEF([ac_var])dnl
])# AC_CHECK_FUNC
</pre>
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