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Autoconf Macro: ac_cxx_have_empty_iostream
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<h1>
ac_cxx_have_empty_iostream
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_CXX_HAVE_EMPTY_IOSTREAM</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
Check if the compiler allow the empty iostream constructor. Ok before gcc3,
not after.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Alain BARBET <alian@cpan.org>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2003-04-09
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
AC_DEFUN([AC_CXX_HAVE_EMPTY_IOSTREAM],
[AC_CACHE_CHECK(whether the compiler allow empty iostream,
ac_cv_cxx_have_empty_iostream,
[AC_REQUIRE([AC_CXX_NAMESPACES])
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <iostream>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[iostream iostr; return 0;],
ac_cv_cxx_have_empty_iostream=yes, ac_cv_cxx_have_empty_iostream=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_empty_iostream" = yes; then
AC_DEFINE(HAVE_EMPTY_IOSTREAM,,[define if the compiler allow empty
iostream])
fi
])
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