From: utzoo!henry
Newsgroups: net.bugs.v7
Title: make -n vs make 
Article-I.D.: utzoo.2482
Posted: Mon Sep 20 19:36:23 1982
Received: Mon Sep 20 19:36:23 1982

In a standard V7, if one makes awk, changes run.c, and then goes to
rebuild awk, a curious thing happens.  "make -n" predicts that the
whole thing will be redone from scratch.  "make" alone, though, does
the superficially-correct thing, recompiling run.c and reloading awk.
Does anybody know why?  I lack the time to investigate.