Re: What I learned today...

[Benjamin Franksen <benjamin.franksen@helmholtz-berlin.de>]

On Thursday, February 28, 2013 09:41:14 Michael Davidsaver wrote:
> Makefiles are so much fun...
> 
> If you don't like creating marker files (which must be cleaned) you can
> 
> also do:
> > one two three: create_some_files.pl
> > 
> >     ./create_some_files.pl
> > 
> > three: two
> > two: one
> 
> This creates a dependency chain forcing sequential execution.

Yes, but...

(1) The script can be called more often than necessary:

> make -j   
./create_some_files.pl < /usr/share/dict/words
./create_some_files.pl < /usr/share/dict/words
./create_some_files.pl < /usr/share/dict/words

Imagine you have a list of 100 files...

(I was a bit surprised by this, in fact.)

(2) Getting the additional sequentializing dependencies right is harder and 
the result less obvious. Again, think of a generated list of many, many files 
(in our case the script creates 692 targets).

Cheers
-- 
Ben Franksen
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