+#
+# Determine if the system can handle the -R option being passed to the linker.
+#
+# This macro is specific to LLVM.
+#
+AC_DEFUN([AC_LINK_USE_R],
+[AC_CACHE_CHECK([for compiler -Wl,-R<path> option],[llvm_cv_link_use_r],
+[ AC_LANG_PUSH([C])
+ oldcflags="$CFLAGS"
+ CFLAGS="$CFLAGS -Wl,-R."
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[int main() { return 0; }]])],
+ [llvm_cv_link_use_r=yes],[llvm_cv_link_use_r=no])
+ CFLAGS="$oldcflags"
+ AC_LANG_POP([C])
+])
+if test "$llvm_cv_link_use_r" = yes ; then
+ AC_DEFINE([HAVE_LINK_R],[1],[Define if you can use -Wl,-R. to pass -R. to the linker, in order to add the current directory to the dynamic linker search path.])
+ fi
+])
+
+#
+# Determine if the system can handle the -R option being passed to the linker.
+#
+# This macro is specific to LLVM.
+#
+AC_DEFUN([AC_LINK_EXPORT_DYNAMIC],
+[AC_CACHE_CHECK([for compiler -Wl,-export-dynamic option],
+ [llvm_cv_link_use_export_dynamic],
+[ AC_LANG_PUSH([C])
+ oldcflags="$CFLAGS"
+ CFLAGS="$CFLAGS -Wl,-export-dynamic"
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[int main() { return 0; }]])],
+ [llvm_cv_link_use_export_dynamic=yes],[llvm_cv_link_use_export_dynamic=no])
+ CFLAGS="$oldcflags"
+ AC_LANG_POP([C])
+])
+if test "$llvm_cv_link_use_export_dynamic" = yes ; then
+ AC_DEFINE([HAVE_LINK_EXPORT_DYNAMIC],[1],[Define if you can use -Wl,-export-dynamic.])
+ fi
+])
+