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Diffstat (limited to 'm4/ac_cxx_have_empty_iostream.m4')
-rw-r--r-- | m4/ac_cxx_have_empty_iostream.m4 | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/m4/ac_cxx_have_empty_iostream.m4 b/m4/ac_cxx_have_empty_iostream.m4 new file mode 100644 index 0000000..acc10e2 --- /dev/null +++ b/m4/ac_cxx_have_empty_iostream.m4 @@ -0,0 +1,61 @@ +# =========================================================================== +# http://autoconf-archive.cryp.to/ac_cxx_have_empty_iostream.html +# =========================================================================== +# +# SYNOPSIS +# +# AC_CXX_HAVE_EMPTY_IOSTREAM +# +# DESCRIPTION +# +# Check if the compiler allow the empty iostream constructor. Ok before +# gcc3, not after. +# +# LICENSE +# +# Copyright (c) 2008 Alain BARBET <alian@cpan.org> +# +# This program is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by the +# Free Software Foundation; either version 2 of the License, or (at your +# option) any later version. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General +# Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program. If not, see <http://www.gnu.org/licenses/>. +# +# As a special exception, the respective Autoconf Macro's copyright owner +# gives unlimited permission to copy, distribute and modify the configure +# scripts that are the output of Autoconf when processing the Macro. You +# need not follow the terms of the GNU General Public License when using +# or distributing such scripts, even though portions of the text of the +# Macro appear in them. The GNU General Public License (GPL) does govern +# all other use of the material that constitutes the Autoconf Macro. +# +# This special exception to the GPL applies to versions of the Autoconf +# Macro released by the Autoconf Archive. When you make and distribute a +# modified version of the Autoconf Macro, you may extend this special +# exception to the GPL to apply to your modified version as well. + +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 +]) |