[En-Nut-Discussion] Trouble with nutconf and 'nut' subdirectory + make question

[Christian.Schilmoeller at camco.de]

I've had the problem with the disappearing *.elf-files, too. The "rm" 
command is found nowhere in the makefile, but nevertheless "make" performs 
this delete operation. The reason for this is that "make" regards the 
*.elf-file as a temporary one, not as a target of the build process. IIRC, 
I solved this problem by copying the line that generates the *.elf-file 
into the section that lists the targets (the *.hex-file is also found 
there). The changes must be applied to a file named "Makerules" found in 
the Ethernut directory.
I'm not 100% sure about this, just to give you a hint. Unfortunately, the 
make manual is a big chunk... I've also read something about the PRECIOUS 
keyword that does something similar (preserves files that would be deleted 
otherwise).