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

[Rustom Mody]

Sorry for the earlier mail: Send got pressed on a half-cooked mail :-)

Heres a cleanup.
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Build-tools like scons rethink make's "older timestamp => rebuild"
model.  You may want to look at one such.

>From http://www.scons.org/architecture/index.html

> (S)Cons decides if a file was out-of-date by using MD5 checksums of the 
> contents of
> files, not timestamps.

SCons also comes to mind because you are using make for R not
(traditional) programming

[Again from the above link]
> Most of the build tools just mentioned were written by programmers and for
> programmers.

....

> (SCons arose from a)
> design contest with the express goal of producing a set of next-generation 
> utilities,
> including a build tool, that  would be accessible not only to programmers but 
> also to
> computer users such as physical scientists.


[Disclaimer: Ive not tried Scons myself]