Allen S. Rout <a...@ufl.edu> wrote: > 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. :) >
I first saw it in Kernighan and Pike's "Unix Programming Environment" (1984!). I'm sure the trick went back even further. Nick
