"generating prerequisites automatically" causes all *.d makefiles to be regenerated?

> Hello,
>
> I read and implemented the guidelines in the section of the GNU Make  
> manual “4.14 Generating Prerequisities Automatically”.  It works  
> great, for each C source file, I have a corresponding .d file, which  
> is also a makefile, generated, and all those makefiles are included  
> in the main makefile with the “include” directive.  In the .d file  
> are header file dependencies for that particular C file.
>
> There seems to be a problem however with this approach.  I write  
> “seems” because it must be that I don’t understand something, as I  
> am sure the GNU Make manual recommends the “right thing”.  Please  
> help me understand what I am missing.
>
>
>
> The problem I have is:  when I do
> >make foobar.o
>
> make then tries to generate all these *.d files, all of them – not  
> just the one that is needed foobar.d !  That is not good –takes a  
> lot of time if I just want one foobar.o.  Also, what is worse,
> if I do
>
> >make clean
>
> Then again, all the *.d files are generated first, takes a very long  
> time, before everything is deleted.
>
>
> How to do it so that only the *.d files that are really needed are  
> generated, and none are generated on make clean?
>
> Thank you for any insight,
>
> Mark
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