From 09aa2c94186081267753dedb50acb102717a6577 Mon Sep 17 00:00:00 2001
From: Daniel Pfeifer <daniel@pfeifer-mail.de>
Date: Thu, 23 Jun 2016 00:29:47 +0200
Subject: Use <unordered_set> where available

---
 Source/Checks/cm_cxx_features.cmake    | 1 +
 Source/Checks/cm_cxx_unordered_set.cxx | 7 +++++++
 Source/cmConfigure.cmake.h.in          | 1 +
 Source/cmGeneratorTarget.cxx           | 5 ++++-
 Source/cmTarget.cxx                    | 6 +++++-
 5 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 Source/Checks/cm_cxx_unordered_set.cxx

diff --git a/Source/Checks/cm_cxx_features.cmake b/Source/Checks/cm_cxx_features.cmake
index b0ecc4c..e550e64 100644
--- a/Source/Checks/cm_cxx_features.cmake
+++ b/Source/Checks/cm_cxx_features.cmake
@@ -33,4 +33,5 @@ endfunction()
 
 if(CMAKE_CXX_STANDARD)
   cm_check_cxx_feature(unordered_map)
+  cm_check_cxx_feature(unordered_set)
 endif()
diff --git a/Source/Checks/cm_cxx_unordered_set.cxx b/Source/Checks/cm_cxx_unordered_set.cxx
new file mode 100644
index 0000000..de4bb77
--- /dev/null
+++ b/Source/Checks/cm_cxx_unordered_set.cxx
@@ -0,0 +1,7 @@
+#include <unordered_set>
+int main()
+{
+  std::unordered_set<int> set;
+  set.insert(0);
+  return 0;
+}
diff --git a/Source/cmConfigure.cmake.h.in b/Source/cmConfigure.cmake.h.in
index 4c5ad2a..a723942 100644
--- a/Source/cmConfigure.cmake.h.in
+++ b/Source/cmConfigure.cmake.h.in
@@ -30,6 +30,7 @@
 #cmakedefine CMAKE_USE_MACH_PARSER
 #cmakedefine CMAKE_ENCODING_UTF8
 #cmakedefine CMake_HAVE_CXX_UNORDERED_MAP
+#cmakedefine CMake_HAVE_CXX_UNORDERED_SET
 #define CMAKE_BIN_DIR "/@CMAKE_BIN_DIR@"
 #define CMAKE_DATA_DIR "/@CMAKE_DATA_DIR@"
 
diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index 9a025d9..3668c82 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -27,7 +27,10 @@
 #include "assert.h"
 #include <errno.h>
 
-#if defined(CMAKE_BUILD_WITH_CMAKE)
+#if defined(CMake_HAVE_CXX_UNORDERED_SET)
+#include <unordered_set>
+#define UNORDERED_SET std::unordered_set
+#elif defined(CMAKE_BUILD_WITH_CMAKE)
 #include <cmsys/hash_set.hxx>
 #define UNORDERED_SET cmsys::hash_set
 #else
diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index 4386080..5e5ed2b 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -27,7 +27,11 @@
 #include <map>
 #include <set>
 #include <stdlib.h> // required for atof
-#if defined(CMAKE_BUILD_WITH_CMAKE)
+
+#if defined(CMake_HAVE_CXX_UNORDERED_SET)
+#include <unordered_set>
+#define UNORDERED_SET std::unordered_set
+#elif defined(CMAKE_BUILD_WITH_CMAKE)
 #include <cmsys/hash_set.hxx>
 #define UNORDERED_SET cmsys::hash_set
 #else
-- 
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