GeneratedCodeAttribute does not allow multiple #122718
Description
Description
With the introduction of soruce generators the GeneratedCodeAttribute got more relevant as SourceGenerator authors can document their source generator version on the generated code.
If there are multiple source generators used which want to set the GeneratedCodeAttribute on a partial class this is not possible because the attribute is configured to not allow multiple occurences on the same class.
This could relate to: #64541
A possible workaround is to place the attribute on a deeper level than the class level e.g. methods. This would require all source generator authors to not use the attribute at all on class level as it could always conflict with other source generators.
Reproduction Steps
//MyClass.Tool1.g.cs
[GeneratedCode("Tool1", "1.0")]
public partial class MyClass
{
}
//MyClass.DifferentTool.g.cs
[GeneratedCode("DifferentTool", "2.0")]
public partial class MyClass
{
}Expected behavior
No compiler error.
Actual behavior
Error CS0579
Regression?
No Regression.
Known Workarounds
Do not use the attribute at class level if writing a source generator.
Configuration
No response
Other information
No response