[libc++] Deprecate the classes in strstream.

[Mordante]

Summary

These have been deprecated since their initial version in libc++. It
seems they were never properly marked as deprecated.

Discovered while working on D151223.

[philnik]

libcxx/include/strstream

144

At least according to cppreference, these have been deprecated since C++98, so we should just use _LIBCPP_DEPRECATED.

[Mordante]

libcxx/include/strstream

144

Hmm indeed. I noticed in the draft repo they were deprecated in C++11. I never bothered to look before that time.
TIL things were standardized as deprecated :-/

[Mordante]

Addresses review comments.

[Mordante]

• Rebased to fix CI
• Fixes and modernizes some tests

[ldionne]

LGTM but can we get a release note?

[philnik]

+1 for a release note.

libcxx/include/strstream

144

That's the bad part about the "standardizing existing practice". It would also have been better to not standardize implicit return 0; in main, but that happened too.

[Mordante]

Thanks for the reviews. I'll add release notes before committing.

libcxx/include/strstream

144

At least that part is backwards compatibility with C. It's mainly that I'm surprised that the first version of the ISO Standard already deprecates things.

libcxx/docs/ReleaseNotes.rst

- Libc++ used to provide some C++11 tag type global variables in C++03 as an extension, which are removed in
   still provided in C++03 as an extension (e.g. ``std::piecewise_construct_t``). Providing those variables in
   C++03 mode made it impossible to define them properly -- C++11 mandated that they be ``constexpr`` variables,
   which is impossible in C++03 mode. Furthermore, C++17 mandated that they be ``inline constexpr`` variables,
   which led to ODR violations when mixed with the C++03 definition. Cleaning this up is required for libc++ to
   make progress on support for C++20 modules.
 
 - The ``_LIBCPP_ABI_OLD_LOGNORMAL_DISTRIBUTION`` macro has been removed.
 
+- The classes ``strstreambuf`` , ``istrstream``, ``ostrstream``, and ``strstream`` have been deprecated.
+  They have been deprecated in the Standard since C++98, but were never marked as deprecated in libc++.
+
 Upcoming Deprecations and Removals
 ----------------------------------
 
 LLVM 18
 ~~~~~~~
 
 - The base template for ``std::char_traits`` has been marked as deprecated and
   will be removed in LLVM 18. If you are using ``std::char_traits`` with types

libcxx/include/strstream

 #include <version>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-class _LIBCPP_TYPE_VIS strstreambuf
+class _LIBCPP_DEPRECATED _LIBCPP_TYPE_VIS strstreambuf
     : public streambuf
 {
 public:
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_HIDE_FROM_ABI strstreambuf() : strstreambuf(0) {}
     explicit strstreambuf(streamsize __alsize);
 #else
     explicit strstreambuf(streamsize __alsize = 0);
strstreambuf::operator=(strstreambuf&& __rhs)
     __pfree_ = __rhs.__pfree_;
     __rhs.setg(nullptr, nullptr, nullptr);
     __rhs.setp(nullptr, nullptr);
     return *this;
 }
 
 #endif // _LIBCPP_CXX03_LANG
 
-class _LIBCPP_TYPE_VIS istrstream
+class _LIBCPP_DEPRECATED _LIBCPP_TYPE_VIS istrstream
     : public istream
 {
 public:
     _LIBCPP_INLINE_VISIBILITY
     explicit istrstream(const char* __s)
         : istream(&__sb_), __sb_(__s, 0) {}
     _LIBCPP_INLINE_VISIBILITY
     explicit istrstream(char* __s)
#endif // _LIBCPP_CXX03_LANG
     strstreambuf* rdbuf() const {return const_cast<strstreambuf*>(&__sb_);}
     _LIBCPP_INLINE_VISIBILITY
     char *str() {return __sb_.str();}
 
 private:
     strstreambuf __sb_;
 };
 
-class _LIBCPP_TYPE_VIS ostrstream
+class _LIBCPP_DEPRECATED _LIBCPP_TYPE_VIS ostrstream
     : public ostream
 {
 public:
     _LIBCPP_INLINE_VISIBILITY
     ostrstream()
         : ostream(&__sb_) {}
     _LIBCPP_INLINE_VISIBILITY
     ostrstream(char* __s, int __n, ios_base::openmode __mode = ios_base::out)
#endif // _LIBCPP_CXX03_LANG
     char* str()         {return __sb_.str();}
     _LIBCPP_INLINE_VISIBILITY
     int pcount() const  {return __sb_.pcount();}
 
 private:
     strstreambuf __sb_; // exposition only
 };
 
-class _LIBCPP_TYPE_VIS strstream
+class _LIBCPP_DEPRECATED _LIBCPP_TYPE_VIS strstream
     : public iostream
 {
 public:
     // Types
     typedef char                        char_type;
     typedef char_traits<char>::int_type int_type;
     typedef char_traits<char>::pos_type pos_type;
     typedef char_traits<char>::off_type off_type;

libcxx/test/std/depr/depr.ios.members/io_state.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: c++03 || c++11 || c++14
+
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <ios>
 //
 // class ios_base
 // {
 // public:
 //     typedef T1 io_state;
 // };
 
 //  These members were removed for C++17
 
 #include "test_macros.h"
 #include <strstream>
 #include <cassert>
 
 int main(int, char**)
 {
-#if TEST_STD_VER <= 14
     std::strstream::io_state b = std::strstream::eofbit;
     assert(b == std::ios::eofbit);
-#endif
 
   return 0;
 }

libcxx/test/std/depr/depr.ios.members/open_mode.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: c++03 || c++11 || c++14
+
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <ios>
 //
 // class ios_base
 // {
 // public:
 //     typedef T2 open_mode;
 // };
 
 //  These members were removed for C++17
 
 #include "test_macros.h"
 #include <strstream>
 #include <cassert>
 
 int main(int, char**)
 {
-#if TEST_STD_VER <= 14
     std::strstream::open_mode b = std::strstream::app;
     assert(b == std::ios::app);
-#endif
 
   return 0;
 }

libcxx/test/std/depr/depr.ios.members/seek_dir.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// REQUIRES: c++03 || c++11 || c++14
+
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <ios>
 //
 // class ios_base
 // {
 // public:
 //     typedef T3 seek_dir;
 // };
 
 //  These members were removed for C++17
 
 #include "test_macros.h"
 #include <strstream>
 #include <cassert>
 
 int main(int, char**)
 {
-#if TEST_STD_VER <= 14
     std::strstream::seek_dir b = std::strstream::cur;
     assert(b == std::ios::cur);
-#endif
 
   return 0;
 }

libcxx/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class istrstream
 
 // explicit istrstream(const char* s);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/ccp_size.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class istrstream
 
 // explicit istrstream(const char* s, streamsize n);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class istrstream
 
 // explicit istrstream(char* s);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.cons/cp_size.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class istrstream
 
 // explicit istrstream(char* s, streamsize n);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/rdbuf.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class istrstream
 
 // strstreambuf* rdbuf() const;
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.istrstream/depr.istrstream.members/str.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class istrstream
 
 // char* str();
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.istrstream/depr.verify.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
 //
 //===----------------------------------------------------------------------===//
 
 // <strstream>
 
-// class strstreambuf
-//     : public basic_streambuf<char>
+// check that istrstream is marked deprecated
 
 #include <strstream>
-#include <type_traits>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    static_assert((std::is_base_of<std::streambuf, std::strstreambuf>::value), "");
-
-  return 0;
-}
+std::istrstream s("abc"); // expected-warning {{'istrstream' is deprecated}}

libcxx/test/std/depr/depr.str.strstreams/depr.istrstream/types.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class istrstream
 //     : public basic_istream<char>
 // {
 //     ...
 
 #include <strstream>

libcxx/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/cp_size_mode.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class ostrstream
 
 // ostrstream(char* s, int n, ios_base::openmode mode = ios_base::out);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.cons/default.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class ostrstream
 
 // ostrstream();
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/freeze.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class ostrstream
 
 // void freeze(bool freezefl = true);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/pcount.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class ostrstream
 
 // int pcount() const;
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/rdbuf.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class ostrstream
 
 // strstreambuf* rdbuf() const;
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.ostrstream.members/str.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class ostrstream
 
 // char* str();
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.ostrstream/depr.verify.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
 //
 //===----------------------------------------------------------------------===//
 
 // <strstream>
 
-// class strstreambuf
-//     : public basic_streambuf<char>
+// check that ostrstream is marked deprecated
 
 #include <strstream>
-#include <type_traits>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    static_assert((std::is_base_of<std::streambuf, std::strstreambuf>::value), "");
-
-  return 0;
-}
+std::ostrstream s; // expected-warning {{'ostrstream' is deprecated}}

libcxx/test/std/depr/depr.str.strstreams/depr.ostrstream/types.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class ostrstream
 //     : public basic_ostream<char>
 // {
 //     ...
 
 #include <strstream>

libcxx/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/cp_size_mode.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstream
 
 // strstream(char* s, int n, ios_base::openmode mode = ios_base::in | ios_base::out);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.cons/default.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstream
 
 // strstream();
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.dest/rdbuf.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstream
 
 // strstreambuf* rdbuf() const;
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/freeze.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstream
 
 // void freeze(bool freezefl = true);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/pcount.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstream
 
 // int pcount() const;
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstream/depr.strstream.oper/str.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstream
 
 // char* str();
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstream/depr.verify.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
 //
 //===----------------------------------------------------------------------===//
 
 // <strstream>
 
-// class strstreambuf
-//     : public basic_streambuf<char>
+// check that strstream is marked deprecated
 
 #include <strstream>
-#include <type_traits>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    static_assert((std::is_base_of<std::streambuf, std::strstreambuf>::value), "");
-
-  return 0;
-}
+std::strstream s; // expected-warning {{'strstream' is deprecated}}

libcxx/test/std/depr/depr.str.strstreams/depr.strstream/types.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstream
 //     : public basic_iostream<char>
 // {
 // public:
 //     // Types
 //     typedef char                        char_type;

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ccp_size.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // strstreambuf(const char* gnext_arg, streamsize n);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cp_size_cp.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // strstreambuf(char* gnext_arg, streamsize n, char* pbeg_arg = 0);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cscp_size.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // strstreambuf(const signed char* gnext_arg, streamsize n);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/cucp_size.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // strstreambuf(const unsigned char* gnext_arg, streamsize n);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/custom_alloc.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // strstreambuf(void* (*palloc_arg)(size_t), void (*pfree_arg)(void*));
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/default.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // explicit strstreambuf(streamsize alsize_arg = 0); // before C++20
 // strstreambuf() : strstreambuf(0) {}               // C++20
 // explicit strstreambuf(streamsize alsize_arg);     // C++20
 

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/scp_size_scp.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // strstreambuf(signed char* gnext_arg, streamsize n, signed char* pbeg_arg = 0);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.cons/ucp_size_ucp.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // strstreambuf(unsigned char* gnext_arg, streamsize n, unsigned char* pbeg_arg = 0);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/freeze.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // void freeze(bool freezefl = true);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/overflow.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // int overflow(int c);
 
 #include <iostream>
 #include <string>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/pcount.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // int pcount() const;
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/str.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // char* str();
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/overflow.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // int_type overflow(int_type c = EOF);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/pbackfail.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // int_type pbackfail(int_type c = EOF);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekoff.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // pos_type seekoff(off_type off, ios_base::seekdir way,
 //                  ios_base::openmode which = ios_base::in | ios_base::out);
 
 #include <strstream>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/seekpos.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // pos_type seekpos(pos_type sp,
 //                  ios_base::openmode which = ios_base::in | ios_base::out);
 
 #include <strstream>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/setbuf.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // streambuf* setbuf(char* s, streamsize n);
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.virtuals/underflow.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 
 // int_type underflow();
 
 #include <strstream>
 #include <cassert>

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.verify.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
 //
 //===----------------------------------------------------------------------===//
 
 // <strstream>
 
-// class strstreambuf
-//     : public basic_streambuf<char>
+// check that strstreambuf is marked deprecated
 
 #include <strstream>
-#include <type_traits>
 
-#include "test_macros.h"
-
-int main(int, char**)
-{
-    static_assert((std::is_base_of<std::streambuf, std::strstreambuf>::value), "");
-
-  return 0;
-}
+std::strstreambuf s; // expected-warning {{'strstreambuf' is deprecated}}

libcxx/test/std/depr/depr.str.strstreams/depr.strstreambuf/types.pass.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
 //
 //===----------------------------------------------------------------------===//
 
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS
+
 // <strstream>
 
 // class strstreambuf
 //     : public basic_streambuf<char>
 
 #include <strstream>
 #include <type_traits>
 
 #include "test_macros.h"
 
 int main(int, char**)
 {
     static_assert((std::is_base_of<std::streambuf, std::strstreambuf>::value), "");
 
   return 0;
 }