[libcxx] Rejigger test for destroying delete feature-test macros
In r361572, we introduced library support for C++20 destroying delete
and decided to only define the library feature-test macro when the
compiler supports the underlying language feature. This patch reworks
the tests to mirror that.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@366263 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/std/language.support/support.dynamic/destroying_delete_t.pass.cpp b/test/std/language.support/support.dynamic/destroying_delete_t.pass.cpp
index 834222c..fa4e77c 100644
--- a/test/std/language.support/support.dynamic/destroying_delete_t.pass.cpp
+++ b/test/std/language.support/support.dynamic/destroying_delete_t.pass.cpp
@@ -52,10 +52,19 @@
::operator delete(a);
}
-#ifndef __cpp_lib_destroying_delete
-#error "Expected __cpp_lib_destroying_delete to be defined"
-#elif __cpp_lib_destroying_delete < 201806L
-#error "Unexpected value of __cpp_lib_destroying_delete"
+// Only test the definition of the library feature-test macro when the compiler
+// supports the feature -- otherwise we don't define the library feature-test
+// macro.
+#if defined(__cpp_impl_destroying_delete)
+# if !defined(__cpp_lib_destroying_delete)
+# error "Expected __cpp_lib_destroying_delete to be defined"
+# elif __cpp_lib_destroying_delete < 201806L
+# error "Unexpected value of __cpp_lib_destroying_delete"
+# endif
+#else
+# if defined(__cpp_lib_destroying_delete)
+# error "The library feature-test macro for destroying delete shouldn't be defined when the compiler doesn't support the language feature"
+# endif
#endif
int main() {
