build: disable rtti for release builds

m4/nc_debugging.m4

@@ -61,6 +61,8 @@ AC_DEFUN([NC_DEBUGGING],[
         NC_APPEND_ONE_COMPILE_FLAG([-O0])
     ], [
         AX_APPEND_COMPILE_FLAGS([-O2])
+        AX_APPEND_COMPILE_FLAGS([-fno-rtti])
+        AC_DEFINE([NO_RTTI], [], [RTTI disabled])
     ])
 
     ##-------------------------------------------------------------------------

test/tuple.cpp

@@ -26,6 +26,7 @@ main ()
     }
 
     {
+    #if !defined(NO_RTTI)
         auto tuple = std::make_tuple (1u, 1, 1.f, 1.);
         std::vector<std::type_index> expected {
             std::type_index (typeid (1u)),
@@ -40,8 +41,12 @@ main ()
         });
 
         tap.expect_eq (actual, expected, "type iteration");
+    #else
+        tap.skip ("type iteration");
+    #endif
     }
 
+
     {
         using src_t = std::tuple<std::string>;
         using dst_t = typename util::tuple::map<src_t, int_mapper>::type;