Revert r372777: [libc++] Implement LWG 2510 and its follow-ups

This also reverts:
 - r372778: [libc++] Implement LWG 3158
 - r372782: [libc++] Try fixing tests that fail on GCC 5 and older
 - r372787: Purge mentions of GCC 4 from the test suite

Reason: the change breaks compilation of LLVM with libc++, for details see
http://lists.llvm.org/pipermail/libcxx-dev/2019-September/000599.html

llvm-svn: 372832

4 files changed, 8 insertions, 53 deletions

diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
index c4e10715f27..d69c28be72b 100644
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp
@@ -15,6 +15,10 @@
 // (except clang-3.6 which temporarily enabled sized-deallocation)
 // UNSUPPORTED: clang, apple-clang
 
+// NOTE: GCC 4.9.1 does not support sized-deallocation in C++14. However
+// GCC 5.1 does.
+// XFAIL: gcc-4.7, gcc-4.8, gcc-4.9
+
 #include <new>
 #include <cstddef>
 #include <cstdlib>
diff --git a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
index 819d62ae2fb..deb17d1ae74 100644
--- a/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
+++ b/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp
@@ -15,6 +15,10 @@
 // (except clang-3.6 which temporarily enabled sized-deallocation)
 // UNSUPPORTED: clang, apple-clang
 
+// NOTE: GCC 4.9.1 does not support sized-deallocation in C++14. However
+// GCC 5.1 does.
+// XFAIL: gcc-4.7, gcc-4.8, gcc-4.9
+
 #include <new>
 #include <cstddef>
 #include <cstdlib>
diff --git a/libcxx/test/std/language.support/support.dynamic/nothrow_t.fail.cpp b/libcxx/test/std/language.support/support.dynamic/nothrow_t.fail.cpp
deleted file mode 100644
index 78ab087c3ea..00000000000
--- a/libcxx/test/std/language.support/support.dynamic/nothrow_t.fail.cpp
+++ /dev/null
@@ -1,30 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// Before GCC 6, aggregate initialization kicks in.
-// See https://stackoverflow.com/q/41799015/627587.
-// UNSUPPORTED: gcc-5
-
-// struct nothrow_t {
-//   explicit nothrow_t() = default;
-// };
-// extern const nothrow_t nothrow;
-
-// This test checks for LWG 2510.
-
-#include <new>
-
-
-std::nothrow_t f() { return {}; } // expected-error 1 {{chosen constructor is explicit in copy-initialization}}
-
-int main(int, char**) {
-    return 0;
-}
diff --git a/libcxx/test/std/language.support/support.dynamic/nothrow_t.pass.cpp b/libcxx/test/std/language.support/support.dynamic/nothrow_t.pass.cpp
deleted file mode 100644
index 3a6231329f0..00000000000
--- a/libcxx/test/std/language.support/support.dynamic/nothrow_t.pass.cpp
+++ /dev/null
@@ -1,23 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// struct nothrow_t {
-//   explicit nothrow_t() = default;
-// };
-// extern const nothrow_t nothrow;
-
-#include <new>
-
-
-int main(int, char**) {
-  std::nothrow_t x = std::nothrow;
-  (void)x;
-
-  return 0;
-}