diff -r 000000000000 -r 6f7a81934006 acinclude.m4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/acinclude.m4	Wed Jan 16 22:39:43 2008 +0100
@@ -0,0 +1,30 @@
+dnl TRY_CXX_FLAG(FLAG,[ACTION-IF-FOUND[,ACTION-IF-NOT-FOUND]])
+AC_DEFUN(TRY_CXX_FLAG,
+[echo >conftest.cc
+if ${CXX-g++} ${CXXFLAGS} -c [$1] conftest.cc >/dev/null 2>&1; then
+  ifelse([$2], , :, [rm -f conftest*
+  $2])
+else
+  ifelse([$3], , :, [rm -f conftest*
+  $3])
+fi
+rm -f conftest*])
+
+AC_DEFUN(CXX_NO_RTTI,
+[AC_CACHE_CHECK(whether ${CXX-g++} accepts -fno-rtti,
+	local_cv_flag_NO_RTTI,
+	TRY_CXX_FLAG(-fno-rtti,
+		local_cv_flag_NO_RTTI=yes,
+		local_cv_flag_NO_RTTI=no))
+test "$local_cv_flag_NO_RTTI" = yes && CXXFLAGS="$CXXFLAGS -fno-rtti"
+])
+
+AC_DEFUN(CXX_NO_EXCEPTIONS,
+[AC_CACHE_CHECK(whether ${CXX-g++} accepts -fno-exceptions,
+	local_cv_flag_NO_EXCEPTIONS,
+	TRY_CXX_FLAG(-fno-exceptions,
+		local_cv_flag_NO_EXCEPTIONS=yes,
+		local_cv_flag_NO_EXCEPTIONS=no))
+test "$local_cv_flag_NO_EXCEPTIONS" = yes && CXXFLAGS="$CXXFLAGS -fno-exceptions"
+])
+