Re: [O] Not overwriting unchanged source code files when tangling

[Allen S. Rout]

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