1 files changed, 84 insertions, 0 deletions
diff --git a/m4/ac_cxx_have_freeze_sstream.m4 b/m4/ac_cxx_have_freeze_sstream.m4
new file mode 100644
index 0000000..3fe1bae
--- /dev/null
+++ b/m4/ac_cxx_have_freeze_sstream.m4
@@ -0,0 +1,84 @@
+# ===========================================================================
+#       http://autoconf-archive.cryp.to/ac_cxx_have_freeze_sstream.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AC_CXX_HAVE_FREEZE_SSTREAM
+#
+# DESCRIPTION
+#
+#   Check if the compiler has (need) freeze method call in stringstream/
+#   strstream. Seems that Win32 and STLPort have it, libstdc++ not ...
+#
+#   Eg:
+#
+#     #include <sstream>
+#     #ifdef HAVE_NAMESPACES
+#     using namespace std;
+#     #endif
+#     #ifdef HAVE_SSTREAM
+#     stringstream message;
+#     #else
+#     strstream message;
+#     #endif
+#     message << "Hello";
+#     #ifdef HAVE_FREEZE_SSTREAM
+#     message.freeze(0);
+#     #endif
+#
+# 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_FREEZE_SSTREAM],
+[AC_CACHE_CHECK(whether the compiler has freeze in stringstream,
+ac_cv_cxx_have_freeze_sstream,
+[AC_REQUIRE([AC_CXX_NAMESPACES])
+  AC_REQUIRE([AC_CXX_HAVE_SSTREAM])
+  AC_LANG_SAVE
+  AC_LANG_CPLUSPLUS
+  AC_TRY_COMPILE([#include <sstream>
+#ifdef HAVE_NAMESPACES
+using namespace std;
+#endif],
+[#ifdef HAVE_SSTREAM
+stringstream message;
+#else
+strstream message;
+#endif
+message << "Hello"; message.freeze(0); return 0;],
+  ac_cv_cxx_have_freeze_sstream=yes, ac_cv_cxx_have_freeze_sstream=no)
+  AC_LANG_RESTORE
+])
+if test "$ac_cv_cxx_have_freeze_sstream" = yes; then
+   AC_DEFINE(HAVE_FREEZE_SSTREAM,,[define if the compiler has freeze in
+stringstream])
+fi
+])