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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
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<head>
<title>
Autoconf Macro: ac_c_var_func
</title>
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<hr>
<h1>
ac_c_var_func
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_C_VAR_FUNC</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
This macro tests if the C complier supports the C9X standard __func__
indentifier.
</p>
<p>
The new C9X standard for the C language stipulates that the identifier
__func__ shall be implictly declared by the compiler as if, immediately
following the opening brace of each function definition, the declaration
</p>
<pre>
static const char __func__[] = "function-name";
</pre>
<p>
appeared, where function-name is the name of the function where the
__func__ identifier is used.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Christopher Currie <christopher@currie.com>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2000-07-19
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_C_VAR_FUNC],
[AC_REQUIRE([AC_PROG_CC])
AC_CACHE_CHECK(whether $CC recognizes __func__, ac_cv_c_var_func,
AC_TRY_COMPILE(,
[int main() {
char *s = __func__;
}],
AC_DEFINE(HAVE_FUNC,,
[Define if the C complier supports __func__]) ac_cv_c_var_func=yes,
ac_cv_c_var_func=no) )
])dnl
</pre>
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