[libc++] [test] Eliminate libcpp-no-noexcept-function-type and libcpp-no-structured-bindings.

At this point, every supported compiler that claims a -std=c++17 mode
should also support these features.

Differential Revision: https://reviews.llvm.org/D113436

Author: Quuxplusone

libcxx/test/std/utilities/meta/meta.rel/is_nothrow_invocable.pass.cpp

@@ -54,30 +54,16 @@ constexpr bool throws_invocable_r() {
          !std::is_nothrow_invocable_r<Ret, Fn, Args...>::value;
 }
 
-// FIXME(EricWF) Don't test the where noexcept is *not* part of the type system
-// once implementations have caught up.
 void test_noexcept_function_pointers() {
   struct Dummy {
     void foo() noexcept {}
     static void bar() noexcept {}
   };
-#if !defined(__cpp_noexcept_function_type)
-  {
-    // Check that PMF's and function pointers *work*. is_nothrow_invocable will always
-    // return false because 'noexcept' is not part of the function type.
-    static_assert(throws_invocable<decltype(&Dummy::foo), Dummy&>(), "");
-    static_assert(throws_invocable<decltype(&Dummy::bar)>(), "");
-  }
-#else
-  {
-    // Check that PMF's and function pointers actually work and that
-    // is_nothrow_invocable returns true for noexcept PMF's and function
-    // pointers.
-    static_assert(
-        std::is_nothrow_invocable<decltype(&Dummy::foo), Dummy&>::value, "");
-    static_assert(std::is_nothrow_invocable<decltype(&Dummy::bar)>::value, "");
-  }
-#endif
+  // Check that PMF's and function pointers actually work and that
+  // is_nothrow_invocable returns true for noexcept PMF's and function
+  // pointers.
+  static_assert(std::is_nothrow_invocable<decltype(&Dummy::foo), Dummy&>::value, "");
+  static_assert(std::is_nothrow_invocable<decltype(&Dummy::bar)>::value, "");
 }
 
 int main(int, char**) {

libcxx/test/std/utilities/tuple/tuple.tuple/tuple.helper/tuple_size_structured_bindings.pass.cpp

@@ -15,7 +15,6 @@
 //     : public integral_constant<size_t, sizeof...(Types)> { };
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: libcpp-no-structured-bindings
 
 #include <tuple>
 #include <array>

libcxx/utils/libcxx/test/features.py

@@ -36,13 +36,11 @@
   Feature(name='-fsized-deallocation',          when=lambda cfg: hasCompileFlag(cfg, '-fsized-deallocation')),
   Feature(name='-faligned-allocation',          when=lambda cfg: hasCompileFlag(cfg, '-faligned-allocation')),
   Feature(name='fdelayed-template-parsing',     when=lambda cfg: hasCompileFlag(cfg, '-fdelayed-template-parsing')),
-  Feature(name='libcpp-no-structured-bindings', when=lambda cfg: '__cpp_structured_bindings' not in featureTestMacros(cfg)),
   Feature(name='libcpp-no-concepts',            when=lambda cfg: featureTestMacros(cfg).get('__cpp_concepts', 0) < 201907),
   Feature(name='libcpp-no-coroutines',          when=lambda cfg: featureTestMacros(cfg).get('__cpp_impl_coroutine', 0) < 201902),
   Feature(name='has-fobjc-arc',                 when=lambda cfg: hasCompileFlag(cfg, '-xobjective-c++ -fobjc-arc') and
                                                                  sys.platform.lower().strip() == 'darwin'), # TODO: this doesn't handle cross-compiling to Apple platforms.
   Feature(name='objective-c++',                 when=lambda cfg: hasCompileFlag(cfg, '-xobjective-c++ -fobjc-arc')),
-  Feature(name='no-noexcept-function-type',     when=lambda cfg: featureTestMacros(cfg).get('__cpp_noexcept_function_type', 0) < 201510),
 
   Feature(name='non-lockfree-atomics',
           when=lambda cfg: sourceBuilds(cfg, """

libcxxabi/test/catch_function_03.pass.cpp

@@ -7,7 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 // Can a noexcept function pointer be caught by a non-noexcept catch clause?
-// UNSUPPORTED: no-exceptions, no-noexcept-function-type
+// UNSUPPORTED: c++03, c++11, c++14
+// UNSUPPORTED: no-exceptions
 
 // Support for catching a function pointer including noexcept was shipped in macOS 10.13
 // XFAIL: use_system_cxx_lib && {{.+}}-apple-macosx10.{{9|10|11|12}}

libcxxabi/test/catch_member_function_pointer_02.pass.cpp

@@ -7,7 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 // Can a noexcept member function pointer be caught by a non-noexcept catch clause?
-// UNSUPPORTED: no-exceptions, no-noexcept-function-type
+// UNSUPPORTED: c++03, c++11, c++14
+// UNSUPPORTED: no-exceptions
 
 // Support for catching a function pointer including noexcept was shipped in macOS 10.13
 // XFAIL: use_system_cxx_lib && {{.+}}-apple-macosx10.{{9|10|11|12}}