What is annoying is that on my cygwin system, everytime I type make it rebuilds everything starting from Configure. It doesn't matter if I have touched anything or not. In other words perl Configure.pl && make
will run Configure.pl twice. Very annoying. Tanton ----- Original Message ----- From: "Andy Dougherty" <[EMAIL PROTECTED]> To: "Tom Hughes" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Thursday, September 26, 2002 9:13 AM Subject: Re: Status of my patches ... > On 26 Sep 2002, Tom Hughes wrote: > > > Andy Dougherty <[EMAIL PROTECTED]> wrote: > > > > > > The problem here is that the rule in the Makefile that causes it to > > > > rerun Configure.pl if any of the Configure.pl generated files is out > > > > of date clashes with the recently introduced edit to stop Configure.pl > > > > updating a file that hasn't actually changed. > > > > > > I think that the 'recently-introduced-edit' is wrong. Make's dependency > > > system requires that the stated commands actually bring something > > > up-to-date. > > > > On the other hand, without that edit it winds up rebuilding everything > > every time you run Configure, even if it doesn't have to... > > Yes. That is correct expected 'make' behavior (assuming the dependencies > are correctly listed). By analogy, a Makefile can also assume that > cc -c foo.c > will re-run the compiler, not just run it only if the compiler decides the > output will change in some significant way. > > Yes, I know that's often annoying. I often change things where I *know* > that not everything needs to be rebuilt. In those cases, I don't rely on > 'make' to get it right. I manually get it right -- either by running a > shell script to rebuild just what needs to be rebuilt, or by judicious use > of 'touch' to pretend I rebuilt everything, or by use of cccache to speed > up rebuilds, or by some other trick. > > These are, of course, obvious tricks, and I sometimes wish I didn't have > to do them. However, the alternative is to have incorrect dependencies in > the Makefile and rely on manually rebuilding everything that needs to be > rebuilt. I don't think that's a good plan. > > -- > Andy Dougherty [EMAIL PROTECTED] > > >
