From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Allen S. Rout" <asr@ufl.edu>
Subject: Re: Not overwriting unchanged source code files when tangling
Date: Tue, 22 Nov 2011 16:17:13 -0500
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On 11/19/2011 01:32 PM, Holger Hoefling wrote:
> Hi everyone,
>
> I wanted to thank everyone for their helpful suggestions and wanted to
> share the best solutions I heard of and found.
>
> One solution is to include a rule in the makefile for every sourcecode
> file that that copies it and only updates the copy if something has
> changed (see Nick's email below).
>

Or tangle to one directory, and then copy to another;  then there's one 
rule for all of the transitions.


work/%: tangle/%
	@cmp --silent  $< $@ || ( echo "Updating $@" ; cp $< $@ )

I liked Nick's "cmp" invocation; I started out with diff. :)


- Allen S. Rout