It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/autoconf/m4/cxx_namespaces.m4 b/autoconf/m4/cxx_namespaces.m4
new file mode 100644
index 0000000..d8d650e
--- /dev/null
+++ b/autoconf/m4/cxx_namespaces.m4
@@ -0,0 +1,19 @@
+# Check for C++ namespace support. This is from
+# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_namespaces.html
+#
+AC_DEFUN([AC_CXX_NAMESPACES],
+[AC_CACHE_CHECK(whether the compiler implements namespaces,
+ac_cv_cxx_namespaces,
+[AC_LANG_PUSH([C++])
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+ [[namespace Outer { namespace Inner { int i = 0; }}]],
+ [[using namespace Outer::Inner; return i;]])],
+ ac_cv_cxx_namespaces=yes,
+ ac_cv_cxx_namespaces=no)
+ AC_LANG_POP([C++])
+])
+if test "$ac_cv_cxx_namespaces" = yes; then
+ AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])
+fi
+])
+