Fix PR39749 - Headers containing just #error harm __has_include.

This patch changes <experimental/foo> to use #warning instead of
is harmful to common feature detection idioms.

We should also consider only emitting the warning when __DEPRECATED is
defined, like we do in the <ext/foo> headers. Users may want to specify
"-Werror=-W#warnings" while still ignoring the libc++ warnings.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@350485 91177308-0d34-0410-b5e6-96231b3b80d8

include/experimental/any

@@ -1,11 +1,21 @@
 // -*- C++ -*-
-//===------------------------------ any -----------------------------------===//
+//===------------------------------- any ----------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_ANY
+#define _LIBCPP_EXPERIMENTAL_ANY
 
-#error "<experimental/any> has been removed. Use <any> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/any> has been removed. Use <any> instead.")
+#else
+# warning "<experimental/any> has been removed. Use <any> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_ANY

include/experimental/chrono

@@ -1,11 +1,21 @@
 // -*- C++ -*-
-//===------------------------------ chrono ---------------------------------===//
+//===---------------------------- chrono ----------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_CHRONO
+#define _LIBCPP_EXPERIMENTAL_CHRONO
 
-#error "<experimental/chrono> has been removed. Use <chrono> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/chrono> has been removed. Use <chrono> instead.")
+#else
+# warning "<experimental/chrono> has been removed. Use <chrono> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_CHRONO

include/experimental/numeric

@@ -7,5 +7,15 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_NUMERIC
+#define _LIBCPP_EXPERIMENTAL_NUMERIC
 
-#error "<experimental/numeric> has been removed. Use <numeric> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/numeric> has been removed. Use <numeric> instead.")
+#else
+# warning "<experimental/numeric> has been removed. Use <numeric> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_NUMERIC

include/experimental/optional

@@ -7,5 +7,15 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_OPTIONAL
+#define _LIBCPP_EXPERIMENTAL_OPTIONAL
 
-#error "<experimental/optional> has been removed. Use <optional> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/optional> has been removed. Use <optional> instead.")
+#else
+# warning "<experimental/optional> has been removed. Use <optional> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_OPTIONAL

include/experimental/ratio

@@ -1,11 +1,21 @@
 // -*- C++ -*-
-//===------------------------------ ratio ---------------------------------===//
+//===----------------------------- ratio ----------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_RATIO
+#define _LIBCPP_EXPERIMENTAL_RATIO
 
-#error "<experimental/ratio> has been removed. Use <ratio> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/ratio> has been removed. Use <ratio> instead.")
+#else
+# warning "<experimental/ratio> has been removed. Use <ratio> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_RATIO

include/experimental/string_view

@@ -3,9 +3,19 @@
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_STRING_VIEW
+#define _LIBCPP_EXPERIMENTAL_STRING_VIEW
 
-#error "<experimental/string_view> has been removed. Use <string_view> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/string_view> has been removed. Use <string_view> instead.")
+#else
+# warning "<experimental/string_view> has been removed. Use <string_view> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_STRING_VIEW

include/experimental/system_error

@@ -7,5 +7,15 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR
+#define _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR
 
-#error "<experimental/system_error> has been removed. Use <system_error> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/system_error> has been removed. Use <system_error> instead.")
+#else
+# warning "<experimental/system_error> has been removed. Use <system_error> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_SYSTEM_ERROR

include/experimental/tuple

@@ -7,5 +7,15 @@
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
+#ifndef _LIBCPP_EXPERIMENTAL_TUPLE
+#define _LIBCPP_EXPERIMENTAL_TUPLE
 
-#error "<experimental/tuple> has been removed. Use <tuple> instead."
+#include <__config>
+
+#ifdef _LIBCPP_WARNING
+_LIBCPP_WARNING("<experimental/tuple> has been removed. Use <tuple> instead.")
+#else
+# warning "<experimental/tuple> has been removed. Use <tuple> instead."
+#endif
+
+#endif // _LIBCPP_EXPERIMENTAL_TUPLE

test/libcxx/experimental/diagnostics/syserr/use_header_warning.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/system_error>
+
+#include <experimental/system_error>
+
+// expected-error@experimental/system_error:* {{"<experimental/system_error> has been removed. Use <system_error> instead."}}
+
+int main() {}

test/libcxx/experimental/diagnostics/syserr/version.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/system_error>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/system_error>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main() {}

test/libcxx/experimental/numerics/numeric.ops/use_header_warning.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/numeric>
+
+#include <experimental/numeric>
+
+// expected-error@experimental/numeric:* {{"<experimental/numeric> has been removed. Use <numeric> instead."}}
+
+int main() {}

test/libcxx/experimental/numerics/numeric.ops/version.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/numeric>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/numeric>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main() {}

test/libcxx/experimental/strings/string.view/use_header_warning.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/string_view>
+
+#include <experimental/string_view>
+
+// expected-error@experimental/string_view:* {{"<experimental/string_view> has been removed. Use <string_view> instead."}}
+
+int main() {}

test/libcxx/experimental/strings/string.view/version.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/string_view>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/string_view>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main() {}

test/libcxx/experimental/utilities/any/use_header_warning.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/any>
+
+#include <experimental/any>
+
+// expected-error@experimental/any:* {{"<experimental/any> has been removed. Use <any> instead."}}
+
+int main() {}

test/libcxx/experimental/utilities/any/version.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/any>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/any>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main() {}

test/libcxx/experimental/utilities/optional/use_header_warning.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/optional>
+
+#include <experimental/optional>
+
+// expected-error@experimental/optional:* {{"<experimental/optional> has been removed. Use <optional> instead."}}
+
+int main() {}

test/libcxx/experimental/utilities/optional/version.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/optional>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/optional>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main() {}

test/libcxx/experimental/utilities/ratio/use_header_warning.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/ratio>
+
+#include <experimental/ratio>
+
+// expected-error@experimental/ratio:* {{"<experimental/ratio> has been removed. Use <ratio> instead."}}
+
+int main() {}

test/libcxx/experimental/utilities/ratio/version.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/ratio>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/ratio>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main() {}

test/libcxx/experimental/utilities/time/use_header_warning.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/chrono>
+
+#include <experimental/chrono>
+
+// expected-error@experimental/chrono:* {{"<experimental/chrono> has been removed. Use <chrono> instead."}}
+
+int main() {}

test/libcxx/experimental/utilities/time/version.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/chrono>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/chrono>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main() {}

test/libcxx/experimental/utilities/tuple/use_header_warning.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES: verify-support
+
+// <experimental/tuple>
+
+#include <experimental/tuple>
+
+// expected-error@experimental/tuple:* {{"<experimental/tuple> has been removed. Use <tuple> instead."}}
+
+int main() {}

test/libcxx/experimental/utilities/tuple/version.pass.cpp

@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <experimental/tuple>
+
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-W#warnings"
+#endif
+#include <experimental/tuple>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main() {}