[libc++] Don't skip localization-related headers in header tests

When localization is disabled, we used to skip testing a lot of headers.
However, these headers are now "no-ops" when localization is disabled,
so they can actually be included. As such, we should test their inclusion
in our usual header inclusion tests.

Author: ldionne

libcxx/include/ios

@@ -216,6 +216,11 @@ storage-class-specifier const error_category& iostream_category() noexcept;
 #else
 #  include <__config>
 
+// standard-mandated includes
+
+// [ios.syn]
+#  include <iosfwd>
+
 #  if _LIBCPP_HAS_LOCALIZATION
 
 #    include <__fwd/ios.h>
@@ -230,11 +235,6 @@ storage-class-specifier const error_category& iostream_category() noexcept;
 #    include <__verbose_abort>
 #    include <version>
 
-// standard-mandated includes
-
-// [ios.syn]
-#    include <iosfwd>
-
 #    if _LIBCPP_HAS_ATOMIC_HEADER
 #      include <__atomic/atomic.h> // for __xindex_
 #    endif

libcxx/include/regex

@@ -794,6 +794,19 @@ typedef regex_token_iterator<wstring::const_iterator> wsregex_token_iterator;
 #else
 #  include <__config>
 
+// standard-mandated includes
+
+// [iterator.range]
+#  include <__iterator/access.h>
+#  include <__iterator/data.h>
+#  include <__iterator/empty.h>
+#  include <__iterator/reverse_access.h>
+#  include <__iterator/size.h>
+
+// [re.syn]
+#  include <compare>
+#  include <initializer_list>
+
 #  if _LIBCPP_HAS_LOCALIZATION
 
 #    include <__algorithm/find.h>
@@ -817,19 +830,6 @@ typedef regex_token_iterator<wstring::const_iterator> wsregex_token_iterator;
 #    include <vector>
 #    include <version>
 
-// standard-mandated includes
-
-// [iterator.range]
-#    include <__iterator/access.h>
-#    include <__iterator/data.h>
-#    include <__iterator/empty.h>
-#    include <__iterator/reverse_access.h>
-#    include <__iterator/size.h>
-
-// [re.syn]
-#    include <compare>
-#    include <initializer_list>
-
 #    if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #      pragma GCC system_header
 #    endif
@@ -5336,8 +5336,8 @@ typedef regex_iterator<wstring::const_iterator> wsregex_iterator;
 
 template <class _BidirectionalIterator, class _CharT, class _Traits>
 class _LIBCPP_PREFERRED_NAME(cregex_iterator) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wcregex_iterator))
-    _LIBCPP_PREFERRED_NAME(sregex_iterator)
-        _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wsregex_iterator)) regex_iterator {
+    _LIBCPP_PREFERRED_NAME(sregex_iterator) _LIBCPP_IF_WIDE_CHARACTERS(_LIBCPP_PREFERRED_NAME(wsregex_iterator))
+        regex_iterator {
 public:
   typedef basic_regex<_CharT, _Traits> regex_type;
   typedef match_results<_BidirectionalIterator> value_type;

libcxx/include/syncstream

@@ -122,6 +122,11 @@ namespace std {
 #else
 #  include <__config>
 
+// standard-mandated includes
+
+// [syncstream.syn]
+#  include <ostream>
+
 #  if _LIBCPP_HAS_LOCALIZATION
 
 #    include <__mutex/lock_guard.h>
@@ -130,17 +135,11 @@ namespace std {
 #    include <iosfwd> // required for declaration of default arguments
 #    include <streambuf>
 #    include <string>
-
 #    if _LIBCPP_HAS_THREADS
 #      include <map>
 #      include <shared_mutex>
 #    endif
 
-// standard-mandated includes
-
-// [syncstream.syn]
-#    include <ostream>
-
 #    if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #      pragma GCC system_header
 #    endif

libcxx/utils/libcxx/header_information.py

@@ -179,29 +179,10 @@ def __hash__(self) -> int:
     # headers with #error directives
     "atomic": "_LIBCPP_HAS_ATOMIC_HEADER",
     "stdatomic.h": "_LIBCPP_HAS_ATOMIC_HEADER",
-
-    # headers with #error directives
-    "ios": "_LIBCPP_HAS_LOCALIZATION",
-    # transitive includers of the above headers
-    "clocale": "_LIBCPP_HAS_LOCALIZATION",
-    "codecvt": "_LIBCPP_HAS_LOCALIZATION",
-    "fstream": "_LIBCPP_HAS_LOCALIZATION",
-    "iomanip": "_LIBCPP_HAS_LOCALIZATION",
-    "iostream": "_LIBCPP_HAS_LOCALIZATION",
-    "istream": "_LIBCPP_HAS_LOCALIZATION",
-    "locale": "_LIBCPP_HAS_LOCALIZATION",
-    "ostream": "_LIBCPP_HAS_LOCALIZATION",
-    "regex": "_LIBCPP_HAS_LOCALIZATION",
-    "sstream": "_LIBCPP_HAS_LOCALIZATION",
-    "streambuf": "_LIBCPP_HAS_LOCALIZATION",
-    "strstream": "_LIBCPP_HAS_LOCALIZATION",
-    "syncstream": "_LIBCPP_HAS_LOCALIZATION",
 }
 
 lit_header_restrictions = {
     "barrier": "// UNSUPPORTED: no-threads, c++03, c++11, c++14, c++17",
-    "clocale": "// UNSUPPORTED: no-localization",
-    "codecvt": "// UNSUPPORTED: no-localization",
     "coroutine": "// UNSUPPORTED: c++03, c++11, c++14, c++17",
     "cwchar": "// UNSUPPORTED: no-wide-characters",
     "cwctype": "// UNSUPPORTED: no-wide-characters",
@@ -211,26 +192,14 @@ def __hash__(self) -> int:
     "experimental/type_traits": "// UNSUPPORTED: c++03",
     "experimental/utility": "// UNSUPPORTED: c++03",
     "filesystem": "// UNSUPPORTED: no-filesystem, c++03, c++11, c++14",
-    "fstream": "// UNSUPPORTED: no-localization, no-filesystem",
     "future": "// UNSUPPORTED: no-threads, c++03",
-    "iomanip": "// UNSUPPORTED: no-localization",
-    "ios": "// UNSUPPORTED: no-localization",
-    "iostream": "// UNSUPPORTED: no-localization",
-    "istream": "// UNSUPPORTED: no-localization",
     "latch": "// UNSUPPORTED: no-threads, c++03, c++11, c++14, c++17",
-    "locale": "// UNSUPPORTED: no-localization",
     "mutex": "// UNSUPPORTED: no-threads, c++03",
-    "ostream": "// UNSUPPORTED: no-localization",
     "print": "// UNSUPPORTED: no-filesystem, c++03, c++11, c++14, c++17, c++20, availability-fp_to_chars-missing", # TODO PRINT investigate
-    "regex": "// UNSUPPORTED: no-localization",
     "semaphore": "// UNSUPPORTED: no-threads, c++03, c++11, c++14, c++17",
     "shared_mutex": "// UNSUPPORTED: no-threads, c++03, c++11",
-    "sstream": "// UNSUPPORTED: no-localization",
     "stdatomic.h": "// UNSUPPORTED: no-threads, c++03, c++11, c++14, c++17, c++20",
     "stop_token": "// UNSUPPORTED: no-threads, c++03, c++11, c++14, c++17",
-    "streambuf": "// UNSUPPORTED: no-localization",
-    "strstream": "// UNSUPPORTED: no-localization",
-    "syncstream": "// UNSUPPORTED: no-localization",
     "thread": "// UNSUPPORTED: no-threads, c++03",
     "wchar.h": "// UNSUPPORTED: no-wide-characters",
     "wctype.h": "// UNSUPPORTED: no-wide-characters",