GCC Support for Linux

Updates and fixes to support GCC for Linux

Signed-off-by: Steve Pham <82231385+spham-amzn@users.noreply.github.com>

Co-authored-by: lumberyard-employee-dm <56135373+lumberyard-employee-dm@users.noreply.github.com>

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Entries/AssetBrowserEntry.h

@@ -43,7 +43,6 @@ namespace AzToolsFramework
         {
             friend class AssetBrowserModel;
             friend class AssetBrowserFilterModel;
-            friend class AssetBrowserEntry;
             friend class RootAssetBrowserEntry;
             friend class FolderAssetBrowserEntry;
             friend class SourceAssetBrowserEntry;

Code/Framework/AzToolsFramework/AzToolsFramework/Entity/EditorEntityHelpers.h

@@ -69,7 +69,7 @@ namespace AzToolsFramework
             {
                 return nullptr;
             }
-            return entity->FindComponent<ComponentType>();
+            return entity->template FindComponent<ComponentType>();
         }
     };
 

Code/Framework/AzToolsFramework/AzToolsFramework/Slice/SliceUtilities.cpp

@@ -3460,7 +3460,7 @@ namespace AzToolsFramework
                 static const AZ::u32 kPixelIndentationPerLevel = GetSliceHierarchyMenuIdentationPerLevel();
 
                 // Any asset that acts as a valid target for all selected slice-instance-owned entities can be shown.
-                QMenu* quickPushMenu = quickPushMenu = new QMenu(parent);
+                QMenu* quickPushMenu = new QMenu(parent);
 
                 bool setupMenu = false;
                 if (pushableChangesAvailable)

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/Thumbnail.h

@@ -139,7 +139,7 @@ namespace AZStd
     };
 
     template <>
-    struct AZStd::equal_to<AzToolsFramework::Thumbnailer::SharedThumbnailKey>
+    struct equal_to<AzToolsFramework::Thumbnailer::SharedThumbnailKey>
     {
         AZ_FORCE_INLINE bool operator()(const AzToolsFramework::Thumbnailer::SharedThumbnailKey& left, const AzToolsFramework::Thumbnailer::SharedThumbnailKey& right) const
         {

Code/Framework/AzToolsFramework/Platform/Common/GCC/aztoolsframework_gcc.cmake

@@ -0,0 +1,7 @@
+#
+# Copyright (c) Contributors to the Open 3D Engine Project.
+# For complete copyright and license terms please see the LICENSE at the root of this distribution.
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+#
+#