AC_CXX_HAVE_EMPTY_IOSTREAM
, 

2003年04月09日

Alain BARBET <alian@cpan.org>

GPLWithACException
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cryp.to ac-archive's C++ Support (released)

Check if the compiler allow the empty iostream constructor. Ok before gcc3, not after.

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
])