1 files changed, 53 insertions, 0 deletions
diff --git a/cmake/modules/CheckCxxHashmap.cmake b/cmake/modules/CheckCxxHashmap.cmake
new file mode 100755
index 0000000000..5f16c0ac44
--- /dev/null
+++ b/cmake/modules/CheckCxxHashmap.cmake
@@ -0,0 +1,53 @@
+# - Check if for hash_map.
+# CHECK_HASHMAP ()
+#
+
+include(CheckCXXSourceCompiles)
+
+macro(CHECK_HASHMAP)
+  message(STATUS "Checking for C++ hash_map implementation...")
+  check_cxx_source_compiles("
+		#include <ext/hash_map>
+		int main() {
+			__gnu_cxx::hash_map<int, int> t;
+		}
+"
+    HAVE_GNU_EXT_HASH_MAP
+    )
+  if(HAVE_GNU_EXT_HASH_MAP)
+    message(STATUS "C++ hash_map found in 'ext' dir in namespace __gnu_cxx::")
+  endif(HAVE_GNU_EXT_HASH_MAP)
+
+  check_cxx_source_compiles("
+		#include <ext/hash_map>
+		int main() {
+			std::hash_map<int, int> t;
+		}
+"
+    HAVE_STD_EXT_HASH_MAP
+    )
+  if(HAVE_STD_EXT_HASH_MAP)
+    message(STATUS "C++ hash_map found in 'ext' dir in namespace std::")
+  endif(HAVE_STD_EXT_HASH_MAP)
+
+  check_cxx_source_compiles("
+		#include <hash_map>
+		int main() {
+			hash_map<int, int> t;
+		}
+"
+    HAVE_GLOBAL_HASH_MAP
+    )
+  if(HAVE_GLOBAL_HASH_MAP)
+    message(STATUS "C++ hash_map found in global namespace")
+  endif(HAVE_GLOBAL_HASH_MAP)
+
+  if(NOT HAVE_GNU_EXT_HASH_MAP)
+    if(NOT HAVE_STD_EXT_HASH_MAP)
+      if(NOT HAVE_GLOBAL_HASH_MAP)
+	message(STATUS "C++ hash_map not found")
+      endif(NOT HAVE_GLOBAL_HASH_MAP)
+    endif(NOT HAVE_STD_EXT_HASH_MAP)
+  endif(NOT HAVE_GNU_EXT_HASH_MAP)
+
+endmacro(CHECK_HASHMAP)