[pstl][libc++] Provide uglified header names for interface headers

For the few (currently four) headers that make up the PSTL's interface
to other Standard Libraries, provide a stable uglified header file that
can be included by those Standard Libraries.

We can then more easily change the internal organization of the PSTL
without having to change the integration with Standard Libraries.

llvm-svn: 368088

libcxx/include/algorithm

@@ -5679,7 +5679,7 @@ _LIBCPP_END_NAMESPACE_STD
 _LIBCPP_POP_MACROS
 
 #if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
-#   include <pstl/internal/glue_algorithm_impl.h>
+#   include <__pstl_algorithm>
 #endif
 
 #endif  // _LIBCPP_ALGORITHM

libcxx/include/execution

@@ -13,7 +13,7 @@
 #include <__config>
 
 #if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
-#   include <pstl/internal/glue_execution_defs.h>
+#   include <__pstl_execution>
 #endif
 
 #endif // _LIBCPP_EXECUTION

libcxx/include/memory

@@ -5591,7 +5591,7 @@ _LIBCPP_END_NAMESPACE_STD
 _LIBCPP_POP_MACROS
 
 #if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
-#   include <pstl/internal/glue_memory_impl.h>
+#   include <__pstl_memory>
 #endif
 
 #endif  // _LIBCPP_MEMORY

libcxx/include/numeric

@@ -587,7 +587,7 @@ _LIBCPP_END_NAMESPACE_STD
 _LIBCPP_POP_MACROS
 
 #if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
-#   include <pstl/internal/glue_numeric_impl.h>
+#   include <__pstl_numeric>
 #endif
 
 #endif  // _LIBCPP_NUMERIC

pstl/include/__pstl_algorithm

@@ -0,0 +1,15 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __PSTL_ALGORITHM
+#define __PSTL_ALGORITHM
+
+#include <pstl/internal/glue_algorithm_impl.h>
+
+#endif /* __PSTL_ALGORITHM */

pstl/include/__pstl_execution

@@ -0,0 +1,15 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __PSTL_EXECUTION
+#define __PSTL_EXECUTION
+
+#include <pstl/internal/glue_execution_defs.h>
+
+#endif /* __PSTL_EXECUTION */

pstl/include/__pstl_memory

@@ -0,0 +1,15 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __PSTL_MEMORY
+#define __PSTL_MEMORY
+
+#include <pstl/internal/glue_memory_impl.h>
+
+#endif /* __PSTL_MEMORY */

pstl/include/__pstl_numeric

@@ -0,0 +1,15 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __PSTL_NUMERIC
+#define __PSTL_NUMERIC
+
+#include <pstl/internal/glue_numeric_impl.h>
+
+#endif /* __PSTL_NUMERIC */