Yes, this is a feature, not a bug. If you change the ASD file, ASDF has no way 
to know whether any compiled file in the system is up to date. For example, you 
could have added a system dependency that brings in a new use-package 
relationship and a macro, or reader macro that invalidated every compiled file. 

> On Jul 16, 2018, at 05:02, Chun Tian (binghe) <> wrote:
> Hi ASDF list,
> I have some huge generated Lisp files which took a lot of time to compile 
> into fasl files. I put the sources into my ASD system definitions with other 
> hand-written Lisp files in parallel (thus no dependencies at all).
> I found that, whenever I changed the ASD definition, if I load the system by 
> ASDF:LOAD-SYSTEM, all Lisp files will be recompiled, even their source files 
> are not changed at all.
> Is this a desired feature or possible issue? Do I need to provide sample code 
> to show this “issue”?  I’m using quite a recent ASDF (version:
> Regards,
> Chun Tian

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