You make good points.  I think the easiest thing to do is to create either 
a macro or an intermediary script so that the .hex is only generated once 
in Tup's eyes, and is properly tracked.  Changing the original script would 
be a huge PITA.

On Thursday, March 8, 2018 at 10:48:33 AM UTC-5, Ben Boeckel wrote:
>
> On Thu, Mar 08, 2018 at 07:24:04 -0800, Paul Guenette wrote: 
> > The issue is that the script I'm calling edits the .hex file in place. 
>  So 
> > if I go a->b.tmp, b.tmp -> b.tmp is my only option. 
>
> Can the script be updated? The problem with modifying in place is that 
> you'll never have a clean build; the input file is always newer than the 
> command which ran it. Also, how is Tup (or any build tool) to know that 
> it shouldn't run the `a -> a` step infinitely? Its input was updated, so 
> it should be run again. And so on. 
>
> I'd recommend fixing the tool to not work in-place. This might mean 
> copying the file and then operating on it at the new location. 
>
> > : ../bld/_bin/$(PROJECT_NAME).map ../bld/_bin/$(PROJECT_NAME).hex |> $( 
> > API_DIR)/Tools/crc32.exe %f FFFFFFFF 0 |> 
> > 
> > The above line would also create the correct call, but it throws this 
> error: 
> > 
> > tup error: Unspecified output files - A command is writing to files that 
> > you didn't specify in the Tupfile. You should add them so tup knows what 
> to 
> > expect. 
>
> You can also delete the temp file before the rule exits. 
>
> --Ben 
>

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