Macro: ac_cxx_have_empty_iostream

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Synopsis

  `AC_CXX_HAVE_EMPTY_IOSTREAM`

Version

  $1.0 09/04/2002$ C++_Support @ ac-archive-0.5.39

Author

  Alain BARBET <alian@cpan.org>

Description

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

M4 Source Code

      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
      ])