[libc++][nfc] Add TEST_HAS_NO_FILESYSTEM_LIBRARY.

This avoids using an libc++ internal macro in our tests.

Reviewed By: #libc, philnik, ldionne

Differential Revision: https://reviews.llvm.org/D119642

Author: mordante

libcxx/test/std/iterators/iterator.primitives/iterator.traits/cxx20_iterator_traits.compile.pass.cpp

@@ -41,11 +41,10 @@
 #  include <istream>
 #endif
 
-#ifndef _LIBCPP_HAS_NO_FILESYSTEM_LIBRARY
-# include <filesystem>
+#ifndef TEST_HAS_NO_FILESYSTEM_LIBRARY
+#  include <filesystem>
 #endif
 
-#include "test_macros.h"
 #include "test_iterators.h"
 #include "iterator_traits_cpp17_iterators.h"
 
@@ -210,7 +209,7 @@ static_assert(testConstWithoutConcept<std::cregex_iterator, std::cmatch, std::fo
 static_assert(testConstWithoutConcept<std::cregex_token_iterator, std::csub_match, std::forward_iterator_tag>());
 #endif // !TEST_HAS_NO_LOCALIZATION
 
-#ifndef _LIBCPP_HAS_NO_FILESYSTEM_LIBRARY
+#ifndef TEST_HAS_NO_FILESYSTEM_LIBRARY
 static_assert(testWithoutConcept<std::filesystem::directory_iterator, std::filesystem::directory_entry, std::ptrdiff_t,
                                  const std::filesystem::directory_entry&, const std::filesystem::directory_entry*,
                                  std::input_iterator_tag>());

libcxx/test/std/utilities/format/format.formatter/format.formatter.spec/types.compile.pass.cpp

@@ -23,9 +23,6 @@
 #include <complex>
 #include <concepts>
 #include <deque>
-#ifndef _LIBCPP_HAS_NO_FILESYSTEM_LIBRARY
-#  include <filesystem>
-#endif
 #include <format>
 #include <forward_list>
 #include <list>
@@ -45,6 +42,9 @@
 
 #include "test_macros.h"
 
+#ifndef TEST_HAS_NO_FILESYSTEM_LIBRARY
+#  include <filesystem>
+#endif
 #ifndef TEST_HAS_NO_LOCALIZATION
 #  include <regex>
 #endif
@@ -210,7 +210,7 @@ void test_P1636() {
   assert_formatter_is_disabled<std::bitset<42>, CharT>();
   assert_formatter_is_disabled<std::complex<double>, CharT>();
   assert_formatter_is_disabled<std::error_code, CharT>();
-#ifndef _LIBCPP_HAS_NO_FILESYSTEM_LIBRARY
+#ifndef TEST_HAS_NO_FILESYSTEM_LIBRARY
   assert_formatter_is_disabled<std::filesystem::path, CharT>();
 #endif
   assert_formatter_is_disabled<std::shared_ptr<int>, CharT>();

libcxx/test/support/test_macros.h

@@ -388,6 +388,10 @@ inline void DoNotOptimize(Tp const& value) {
 #  define TEST_HAS_NO_THREADS
 #endif
 
+#if defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
+#  define TEST_HAS_NO_FILESYSTEM_LIBRARY
+#endif
+
 #if defined(__GNUC__)
 #pragma GCC diagnostic pop
 #endif