Tests: Try to fix CI

Author: H-G-Hristov

libcxx/test/std/input.output/span.streams/ispanstream/ispanstream.cons/ros.pass.cpp

@@ -32,9 +32,13 @@
 template <typename CharT, typename TraitsT = std::char_traits<CharT>>
 void test_sfinae() {
   using SpStream =
+#ifndef TEST_HAS_NO_NASTY_STRING
       std::conditional_t<std::same_as<CharT, nasty_char>,
                          std::basic_ispanstream<nasty_char, nasty_char_traits>,
                          std::basic_ispanstream<CharT, TraitsT>>;
+#else
+      std::basic_ispanstream<CharT, TraitsT>;
+#endif
 
   // Non-const convertible
   static_assert(std::constructible_from<SpStream, ReadOnlySpan<CharT>>);

libcxx/utils/generate_feature_test_macro_components.py

@@ -1338,6 +1338,7 @@ def add_version_header(tc):
     "regex": ["UNSUPPORTED: no-localization"],
     "semaphore": ["UNSUPPORTED: no-threads"],
     "shared_mutex": ["UNSUPPORTED: no-threads"],
+    "spanstream": ["UNSUPPORTED: no-localization"],
     "sstream": ["UNSUPPORTED: no-localization"],
     "syncstream": ["UNSUPPORTED: no-localization"],
     "stdatomic.h": ["UNSUPPORTED: no-threads"],