From 3a2c736b41fb394b389607b0ccf96611c42319f5 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 1 Aug 2018 14:01:47 -0400
Subject: Extend C++17/C++14 feature checks to require unique_ptr

When testing compiler modes higher than C++11 for constructs we need,
include a check for using `unique_ptr` in that mode.  The PGI 18.4
compiler in some environments supports `unique_ptr` in C++11 mode
but is broken for C++14 and C++17.  Check that `unique_ptr` works
in these modes before using one.
---
 Source/Checks/cm_cxx14_check.cmake | 2 +-
 Source/Checks/cm_cxx14_check.cpp   | 5 ++++-
 Source/Checks/cm_cxx17_check.cmake | 2 +-
 Source/Checks/cm_cxx17_check.cpp   | 4 +++-
 4 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/Source/Checks/cm_cxx14_check.cmake b/Source/Checks/cm_cxx14_check.cmake
index a78ba35..38606b9 100644
--- a/Source/Checks/cm_cxx14_check.cmake
+++ b/Source/Checks/cm_cxx14_check.cmake
@@ -1,5 +1,5 @@
 set(CMake_CXX14_BROKEN 0)
-if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang|PGI")
   if(NOT CMAKE_CXX14_STANDARD_COMPILE_OPTION)
     set(CMake_CXX14_WORKS 0)
   endif()
diff --git a/Source/Checks/cm_cxx14_check.cpp b/Source/Checks/cm_cxx14_check.cpp
index f5806a9..9369ba2 100644
--- a/Source/Checks/cm_cxx14_check.cpp
+++ b/Source/Checks/cm_cxx14_check.cpp
@@ -1,5 +1,8 @@
 #include <cstdio>
+#include <memory>
+
 int main()
 {
-  return 0;
+  std::unique_ptr<int> u(new int(0));
+  return *u;
 }
diff --git a/Source/Checks/cm_cxx17_check.cmake b/Source/Checks/cm_cxx17_check.cmake
index 83d3971..4da2fd7 100644
--- a/Source/Checks/cm_cxx17_check.cmake
+++ b/Source/Checks/cm_cxx17_check.cmake
@@ -1,5 +1,5 @@
 set(CMake_CXX17_BROKEN 0)
-if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang|PGI")
   if(NOT CMAKE_CXX17_STANDARD_COMPILE_OPTION)
     set(CMake_CXX17_WORKS 0)
   endif()
diff --git a/Source/Checks/cm_cxx17_check.cpp b/Source/Checks/cm_cxx17_check.cpp
index 2cbf1d5..4e89184 100644
--- a/Source/Checks/cm_cxx17_check.cpp
+++ b/Source/Checks/cm_cxx17_check.cpp
@@ -1,7 +1,9 @@
 #include <cstdio>
+#include <memory>
 #include <unordered_map>
 
 int main()
 {
-  return 0;
+  std::unique_ptr<int> u(new int(0));
+  return *u;
 }
-- 
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