[libc++/abi] Fix broken feature no-noexcept-function-type

[ldionne]

Summary

The feature was always defined, which means that the two test cases
guarded by it were never run.

[ldionne]

s/with_system_cxx_lib/use_system_cxx_lib/

[ldionne]

Will ship when CI passes.

libcxx/utils/libcxx/test/features.py

DEFAULT_FEATURES = [
   Feature(name='fdelayed-template-parsing',     when=lambda cfg: hasCompileFlag(cfg, '-fdelayed-template-parsing')),
   Feature(name='libcpp-no-if-constexpr',        when=lambda cfg: '__cpp_if_constexpr' not in featureTestMacros(cfg)),
   Feature(name='libcpp-no-structured-bindings', when=lambda cfg: '__cpp_structured_bindings' not in featureTestMacros(cfg)),
   Feature(name='libcpp-no-deduction-guides',    when=lambda cfg: featureTestMacros(cfg).get('__cpp_deduction_guides', 0) < 201611),
   Feature(name='libcpp-no-concepts',            when=lambda cfg: featureTestMacros(cfg).get('__cpp_concepts', 0) < 201907),
   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, """
             #include <atomic>
             struct Large { int storage[100]; };
             std::atomic<Large> x;
             int main(int, char**) { (void)x.load(); return 0; }
           """)),

libcxxabi/test/catch_function_03.pass.cpp

 //===---------------------- catch_function_03.cpp -------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // Can a noexcept function pointer be caught by a non-noexcept catch clause?
-// UNSUPPORTED: no-exceptions, libcxxabi-no-noexcept-function-type
+// UNSUPPORTED: no-exceptions, no-noexcept-function-type
+
+// 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}}
 
 #include <cassert>
 
 template<bool Noexcept> void f() noexcept(Noexcept) {}
 template<bool Noexcept> using FnType = void() noexcept(Noexcept);
 
 template<bool ThrowNoexcept, bool CatchNoexcept>
 void check()

libcxxabi/test/catch_member_function_pointer_02.pass.cpp

 //===--------------- catch_member_function_pointer_02.cpp -----------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
-// Can a noexcept member function pointer be caught by a non-noexcept catch
-// clause?
-// UNSUPPORTED: no-exceptions, libcxxabi-no-noexcept-function-type
+// Can a noexcept member function pointer be caught by a non-noexcept catch clause?
+// UNSUPPORTED: no-exceptions, no-noexcept-function-type
+
+// 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}}
 
 // GCC 7 and 8 support noexcept function types but this test still fails.
 // This is likely a bug in their implementation. Investigation needed.
 // XFAIL: gcc-7, gcc-8, gcc-9, gcc-10, gcc-11
 
 #include <cassert>
 
 struct X {

libcxxabi/test/libcxxabi/test/config.py

def configure_src_root(self):
         self.libcxx_src_root = self.get_lit_conf(
             'libcxx_src_root',
             os.path.join(self.libcxxabi_src_root, '/../libcxx'))
 
     def configure_obj_root(self):
         self.libcxxabi_obj_root = self.get_lit_conf('libcxxabi_obj_root')
         super(Configuration, self).configure_obj_root()
 
-    def has_cpp_feature(self, feature, required_value):
-        return intMacroValue(self.cxx.dumpMacros().get('__cpp_' + feature, '0')) >= required_value
-
     def configure_features(self):
         super(Configuration, self).configure_features()
-        if not self.has_cpp_feature('noexcept_function_type', 201510):
-            self.config.available_features.add('libcxxabi-no-noexcept-function-type')
         if not self.get_lit_bool('llvm_unwinder', False):
             self.config.available_features.add('libcxxabi-has-system-unwinder')
 
     def configure_compile_flags(self):
         self.cxx.compile_flags += [
             '-DLIBCXXABI_NO_TIMER',
             '-D_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS',
         ]