[PATCH 1/2] Add gcc/make-unique.h

[David Malcolm <dmalcolm@redhat.com>]

This patch adds gcc/make-unique.h, containing a minimal C++11
implementation of make_unique (std::make_unique is C++14).

The followup patch uses this in dozens of places within the analyzer.

Successfully bootstrapped & regrtested on x86_64-pc-linux-gnu.

OK for trunk?

gcc/ChangeLog:
	* make-unique.h: New file.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>
---
 gcc/make-unique.h | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 gcc/make-unique.h

diff --git a/gcc/make-unique.h b/gcc/make-unique.h
new file mode 100644
index 00000000000..752a1d3dd30
--- /dev/null
+++ b/gcc/make-unique.h
@@ -0,0 +1,42 @@
+/* Minimal implementation of make_unique for C++11 compatibility.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_MAKE_UNIQUE
+#define GCC_MAKE_UNIQUE
+
+/* This header uses std::unique_ptr, but <memory> can't be directly
+   included due to issues with macros.  Hence <memory> must be included
+   from system.h by defining INCLUDE_MEMORY in any source file using
+   make-unique.h.  */
+
+#ifndef INCLUDE_MEMORY
+# error "You must define INCLUDE_MEMORY before including system.h to use make-unique.h"
+#endif
+
+/* Minimal implementation of make_unique for C++11 compatibility
+   (std::make_unique is C++14).  */
+
+template<typename T, typename... Args>
+inline typename std::enable_if<!std::is_array<T>::value, std::unique_ptr<T>>::type
+make_unique(Args&&... args)
+{
+  return std::unique_ptr<T> (new T (std::forward<Args> (args)...));
+}
+
+#endif /* ! GCC_MAKE_UNIQUE */
-- 
2.26.3