Properly defined inline ADatabase::instance()

src/database/adatabase.cpp

@@ -68,6 +68,7 @@ void ADatabase::updateLayout()
     emit dataBaseUpdated();
 }
 
+inline
 ADatabase* ADatabase::instance()
 {
 #ifdef __GNUC__

src/database/adatabase.h

@@ -98,7 +98,7 @@ public:
     // Ensure DB is not copiable or assignable
     ADatabase(const ADatabase&) = delete;
     void operator=(const ADatabase&) = delete;
-    static inline ADatabase* instance();
+    static ADatabase* instance();
     TableNames getTableNames() const;
     ColumnNames getTableColumns(TableName table_name) const;
     void updateLayout();