Fix it for standards-complient compilers (GCC/Clang).

Unfortunately, this means that all formatters must be declared in the
same place now, as they must be declared BEFORE the template which uses
them is declared (not just before it was instantiated, which MSVC allows).

Sources/Plasma/CoreLib/plFileSystem.h

@@ -227,10 +227,6 @@ inline plFileName operator+(const char *left, const plFileName &right)
 { return left + right.AsString(); }
 
 
-// Shortcut for use in plFormat
-PL_FORMAT_TYPE(const plFileName &)
-
-
 /** Structure to get information about a file by name.
  *  \sa plFileName
  */

Sources/Plasma/CoreLib/plFormat.h

@@ -132,30 +132,11 @@ namespace plFormat_Private
     };
 
     extern FormatSpec _FetchNextFormat(_IFormatDataObject &data);
-
-    template <typename _Type, typename... _Args>
-    plString _IFormat(_IFormatDataObject &data, _Type value, _Args... args)
-    {
-        plFormat_Private::FormatSpec format = plFormat_Private::_FetchNextFormat(data);
-        data.fOutput.push_back(_impl_plFormat_DataHandler(format, value));
-        return _IFormat(data, args...);
-    }
-
-    // End of the chain -- emits the last piece (if any) and builds the final string
-    plString _IFormat(_IFormatDataObject &data);
-}
-
-template <typename _Type, typename... _Args>
-plString plFormat(const char *fmt_str, _Type value, _Args... args)
-{
-    plFormat_Private::_IFormatDataObject data;
-    data.fFormatStr = fmt_str;
-    plFormat_Private::FormatSpec format = plFormat_Private::_FetchNextFormat(data);
-    data.fOutput.push_back(_impl_plFormat_DataHandler(format, value));
-    return plFormat_Private::_IFormat(data, args...);
 }
 
 /** Declare a formattable type for `plFormat`.
+ *  \note PL_FORMAT_IMPL must only be used in plFormat.h, due to constraints
+ *    on compile-time declaration order imposed by some compilers.
  *  \sa PL_FORMAT_IMPL()
  */
 #define PL_FORMAT_TYPE(_type) \
@@ -193,6 +174,10 @@ plString plFormat(const char *fmt_str, _Type value, _Args... args)
 #define PL_FORMAT_FORWARD(format, fwd_value) \
     _impl_plFormat_DataHandler((format), (fwd_value))
 
+// ====================================
+// BEGIN: Formattable type declarations
+// ====================================
+
     PL_FORMAT_TYPE(char)
     PL_FORMAT_TYPE(wchar_t)
     PL_FORMAT_TYPE(signed char)
@@ -211,6 +196,9 @@ PL_FORMAT_TYPE(const char *)
     PL_FORMAT_TYPE(const wchar_t *)
     PL_FORMAT_TYPE(const plString &)
 
+    // Shortcut for plFileName
+    PL_FORMAT_TYPE(const class plFileName &)
+
     // TODO:  Remove these when they're no longer needed
     PL_FORMAT_TYPE(const std::string &)
     PL_FORMAT_TYPE(const std::wstring &)
@@ -222,4 +210,44 @@ PL_FORMAT_TYPE(const std::wstring &)
     // To use other formats, don't pass us a bool directly...
     PL_FORMAT_TYPE(bool)
 
+    // Formats for plUoid
+    PL_FORMAT_TYPE(const class plLocation &)
+    PL_FORMAT_TYPE(const class plUoid &)
+
+    // Format for plUUID
+    PL_FORMAT_TYPE(const class plUUID &)
+
+// ==================================
+// END: Formattable type declarations
+// ==================================
+
+// NOTE:  Added in order to work properly in GCC/Clang; all PL_FORMAT_TYPE
+// declarations MUST be above this line.
+#undef PL_FORMAT_TYPE
+
+namespace plFormat_Private
+{
+    // End of the chain -- emits the last piece (if any) and builds the final string
+    plString _IFormat(_IFormatDataObject &data);
+
+    // Internal plFormat implementation which carries over the pieces formatted so far
+    template <typename _Type, typename... _Args>
+    plString _IFormat(_IFormatDataObject &data, _Type value, _Args... args)
+    {
+        plFormat_Private::FormatSpec format = plFormat_Private::_FetchNextFormat(data);
+        data.fOutput.push_back(_impl_plFormat_DataHandler(format, value));
+        return _IFormat(data, args...);
+    }
+}
+
+template <typename _Type, typename... _Args>
+plString plFormat(const char *fmt_str, _Type value, _Args... args)
+{
+    plFormat_Private::_IFormatDataObject data;
+    data.fFormatStr = fmt_str;
+    plFormat_Private::FormatSpec format = plFormat_Private::_FetchNextFormat(data);
+    data.fOutput.push_back(_impl_plFormat_DataHandler(format, value));
+    return plFormat_Private::_IFormat(data, args...);
+}
+
 #endif // plFormat_Defined

Sources/Plasma/NucleusLib/pnKeyedObject/plUoid.h

@@ -144,8 +144,6 @@ public:
     static const plLocation kInvalidLoc;
 };
 
-PL_FORMAT_TYPE(const plLocation &)
-
 //// plUoid //////////////////////////////////////////////////////////////////
 
 class plUoid
@@ -200,6 +198,4 @@ protected:
     plLoadMask  fLoadMask;
 };
 
-PL_FORMAT_TYPE(const plUoid &)
-
 #endif // plUoid_h_inc

Sources/Plasma/NucleusLib/pnUUID/pnUUID.h

@@ -96,6 +96,4 @@ public:
     static plUUID Generate();
 };
 
-PL_FORMAT_TYPE(const plUUID &)
-
 #endif // pnUUID_h_inc