Use std::unordered_map instead of hash_map where available.

9 files changed, 85 insertions, 5 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 19d83f1..5a75666 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,6 +48,7 @@ if(NOT DEFINED CMAKE_CXX_STANDARD AND NOT CMake_NO_CXX_STANDARD)
     set(CMAKE_CXX_STANDARD 11)
   endif()
 endif()
+include(${CMake_SOURCE_DIR}/Source/Checks/cm_cxx11_unordered_map.cmake)
 
 # option to set the internal encoding of CMake to UTF-8
 option(CMAKE_ENCODING_UTF8 "Use UTF-8 encoding internally." ON)
diff --git a/Source/Checks/cm_cxx11_unordered_map.cmake b/Source/Checks/cm_cxx11_unordered_map.cmake
new file mode 100644
index 0000000..80fe391
--- /dev/null
+++ b/Source/Checks/cm_cxx11_unordered_map.cmake
@@ -0,0 +1,25 @@
+
+if(CMAKE_CXX_STANDARD AND NOT DEFINED CMake_HAVE_CXX11_UNORDERED_MAP)
+  message(STATUS "Checking if compiler supports C++11 unordered_map")
+  try_compile(CMake_HAVE_CXX11_UNORDERED_MAP
+    ${CMAKE_CURRENT_BINARY_DIR}
+    ${CMAKE_CURRENT_LIST_DIR}/cm_cxx11_unordered_map.cpp
+    CMAKE_FLAGS -DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}
+    OUTPUT_VARIABLE OUTPUT
+    )
+  if(CMake_HAVE_CXX11_UNORDERED_MAP)
+    message(STATUS "Checking if compiler supports C++11 unordered_map - yes")
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+      "Determining if compiler supports C++11 unordered_map passed with the following output:\n"
+      "${OUTPUT}\n"
+      "\n"
+      )
+  else()
+    message(STATUS "Checking if compiler supports C++11 unordered_map - no")
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+      "Determining if compiler supports C++11 unordered_map failed with the following output:\n"
+      "${OUTPUT}\n"
+      "\n"
+      )
+  endif()
+endif()
diff --git a/Source/Checks/cm_cxx11_unordered_map.cpp b/Source/Checks/cm_cxx11_unordered_map.cpp
new file mode 100644
index 0000000..beeb31b
--- /dev/null
+++ b/Source/Checks/cm_cxx11_unordered_map.cpp
@@ -0,0 +1,6 @@
+#include <unordered_map>
+int main() {
+  std::unordered_map<int, int> map;
+  map[0] = 0;
+  return 0;
+}
diff --git a/Source/cmConfigure.cmake.h.in b/Source/cmConfigure.cmake.h.in
index c0a1aa9..62128a7 100644
--- a/Source/cmConfigure.cmake.h.in
+++ b/Source/cmConfigure.cmake.h.in
@@ -14,4 +14,5 @@
 #cmakedefine CMAKE_USE_ELF_PARSER
 #cmakedefine CMAKE_USE_MACH_PARSER
 #cmakedefine CMAKE_ENCODING_UTF8
+#cmakedefine CMake_HAVE_CXX11_UNORDERED_MAP
 #define CMAKE_DATA_DIR "/@CMAKE_DATA_DIR@"
diff --git a/Source/cmDefinitions.h b/Source/cmDefinitions.h
index b244793..245a0bd 100644
--- a/Source/cmDefinitions.h
+++ b/Source/cmDefinitions.h
@@ -14,8 +14,12 @@
 
 #include "cmStandardIncludes.h"
 #if defined(CMAKE_BUILD_WITH_CMAKE)
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+#include <unordered_map>
+#else
 #include "cmsys/hash_map.hxx"
 #endif
+#endif
 
 #include <list>
 
@@ -65,9 +69,12 @@ private:
   };
   static Def NoDef;
 
-  // Local definitions, set or unset.
 #if defined(CMAKE_BUILD_WITH_CMAKE)
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+  typedef std::unordered_map<std::string, Def> MapType;
+#else
   typedef cmsys::hash_map<std::string, Def> MapType;
+#endif
 #else
   typedef std::map<std::string, Def> MapType;
 #endif
diff --git a/Source/cmFileTimeComparison.cxx b/Source/cmFileTimeComparison.cxx
index 5727470..13e2a66 100644
--- a/Source/cmFileTimeComparison.cxx
+++ b/Source/cmFileTimeComparison.cxx
@@ -13,8 +13,12 @@
 
 // Use a hash table to avoid duplicate file time checks from disk.
 #if defined(CMAKE_BUILD_WITH_CMAKE)
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+#include <unordered_map>
+#else
 # include <cmsys/hash_map.hxx>
 #endif
+#endif
 
 #include <cmsys/Encoding.hxx>
 
@@ -47,9 +51,17 @@ private:
       {
       return h(s.c_str());
       }
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+    std::hash<const char*> h;
+#else
     cmsys::hash<const char*> h;
+#endif
     };
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+  typedef std::unordered_map<std::string,
+#else
   typedef cmsys::hash_map<std::string,
+#endif
                           cmFileTimeComparison_Type, HashString> FileStatsMap;
   FileStatsMap Files;
 #endif
diff --git a/Source/cmGlobalGenerator.h b/Source/cmGlobalGenerator.h
index 3b2a41f..c4c98ea 100644
--- a/Source/cmGlobalGenerator.h
+++ b/Source/cmGlobalGenerator.h
@@ -24,7 +24,11 @@
 
 #if defined(CMAKE_BUILD_WITH_CMAKE)
 # include "cmFileLockPool.h"
-# include <cmsys/hash_map.hxx>
+# ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+#  include <unordered_map>
+# else
+#  include <cmsys/hash_map.hxx>
+# endif
 #endif
 
 class cmake;
@@ -429,7 +433,11 @@ protected:
 
   // All targets in the entire project.
 #if defined(CMAKE_BUILD_WITH_CMAKE)
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+  typedef std::unordered_map<std::string, cmTarget*> TargetMap;
+#else
   typedef cmsys::hash_map<std::string, cmTarget*> TargetMap;
+#endif
 #else
   typedef std::map<std::string,cmTarget *> TargetMap;
 #endif
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index e0eef6f..8271cc2 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -31,7 +31,11 @@
 #include <cmsys/auto_ptr.hxx>
 #include <cmsys/RegularExpression.hxx>
 #if defined(CMAKE_BUILD_WITH_CMAKE)
-# include <cmsys/hash_map.hxx>
+# ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+#  include <unordered_map>
+# else
+#  include <cmsys/hash_map.hxx>
+# endif
 #endif
 
 #include <stack>
@@ -868,7 +872,11 @@ protected:
   // libraries, classes, and executables
   mutable cmTargets Targets;
 #if defined(CMAKE_BUILD_WITH_CMAKE)
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+  typedef std::unordered_map<std::string, cmTarget*> TargetMap;
+#else
   typedef cmsys::hash_map<std::string, cmTarget*> TargetMap;
+#endif
 #else
   typedef std::map<std::string, cmTarget*> TargetMap;
 #endif
@@ -1041,7 +1049,11 @@ private:
 
   // A map for fast output to input look up.
 #if defined(CMAKE_BUILD_WITH_CMAKE)
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+  typedef std::unordered_map<std::string, cmSourceFile*> OutputToSourceMap;
+#else
   typedef cmsys::hash_map<std::string, cmSourceFile*> OutputToSourceMap;
+#endif
 #else
   typedef std::map<std::string, cmSourceFile*> OutputToSourceMap;
 #endif
diff --git a/Source/cmTarget.h b/Source/cmTarget.h
index a032414..f43c87c 100644
--- a/Source/cmTarget.h
+++ b/Source/cmTarget.h
@@ -19,7 +19,11 @@
 
 #include <cmsys/auto_ptr.hxx>
 #if defined(CMAKE_BUILD_WITH_CMAKE)
-#include <cmsys/hash_map.hxx>
+# ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+#  include <unordered_map>
+# else
+#  include <cmsys/hash_map.hxx>
+# endif
 #endif
 
 #define CM_FOR_EACH_TARGET_POLICY(F) \
@@ -849,7 +853,11 @@ private:
 };
 
 #ifdef CMAKE_BUILD_WITH_CMAKE
-typedef cmsys::hash_map<std::string,cmTarget> cmTargets;
+#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
+typedef std::unordered_map<std::string, cmTarget> cmTargets;
+#else
+typedef cmsys::hash_map<std::string, cmTarget> cmTargets;
+#endif
 #else
 typedef std::map<std::string,cmTarget> cmTargets;
 #endif