Bring the script out of the dark ages and into modern autoconfness.
llvm-svn: 16415
diff --git a/llvm/autoconf/m4/cxx_namespaces.m4 b/llvm/autoconf/m4/cxx_namespaces.m4
index 756e378..d8d650e 100644
--- a/llvm/autoconf/m4/cxx_namespaces.m4
+++ b/llvm/autoconf/m4/cxx_namespaces.m4
@@ -4,12 +4,13 @@
AC_DEFUN([AC_CXX_NAMESPACES],
[AC_CACHE_CHECK(whether the compiler implements namespaces,
ac_cv_cxx_namespaces,
-[AC_LANG_SAVE
- AC_LANG_CPLUSPLUS
- AC_TRY_COMPILE([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_RESTORE
+[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])