Fix Linux build errors and warnings (#8)

CMakeLists.txt

@@ -41,7 +41,7 @@ base_add_subdir(Utils)
 target_include_directories(${output_lib} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/..")
 
 #Various useful defaults.
-set_target_properties(${output_lib} PROPERTIES CXX_VISIBILITY_PRESET hidden)
+# set_target_properties(${output_lib} PROPERTIES CXX_VISIBILITY_PRESET hidden)
 set_target_properties(${output_lib} PROPERTIES C_VISIBILITY_PRESET hidden)
 set_target_properties(${output_lib} PROPERTIES C_STANDARD 99)
 set_target_properties(${output_lib} PROPERTIES CXX_STANDARD 14)

Journal/JournalCppDefs.hh

@@ -45,6 +45,28 @@ template <class T> String type_name()
 
 #else // JOURNAL_USE_BOOST
 
+/*!
+Override this for any type that is used as output data for C/C++ journals, 
+use the JOURNAL_TYPE_NAME() helper macro.
+*/
+template <typename T>
+typename std::enable_if<!std::is_pointer<T>::value && 
+    !std::is_reference<T>::value && !std::is_const<T>::value, String>::type
+type_name();
+
+//! Forward declaration of the overload for pointer 
+template <typename T>
+typename std::enable_if<std::is_pointer<T>::value, String>::type type_name();
+
+//! Forward declaration of the overload for reference 
+template <typename T>
+typename std::enable_if<std::is_reference<T>::value, String>::type type_name();
+
+//! Forward declaration of the overload for const
+template <typename T>
+typename std::enable_if<std::is_const<T>::value, String>::type type_name();
+
+
 template <typename T>
 typename std::enable_if<std::is_pointer<T>::value, String>::type type_name()
 {
@@ -68,15 +90,6 @@ typename std::enable_if<std::is_const<T>::value, String>::type type_name()
   return str + " const";
 }
 
-/*!
-Override this for any type that is used as output data for C/C++ journals, you
-can use the JOURNAL_TYPE_NAME() helper macro.
-*/
-template <typename T>
-typename std::enable_if<!std::is_pointer<T>::value && 
-    !std::is_reference<T>::value && !std::is_const<T>::value, String>::type
-type_name();
-
 #define JOURNAL_TYPE_NAME(TYPE) \
   template <> String type_name<TYPE>() { return String(#TYPE); }