Re: Patch: cut 'make dep' time in half
Keith Rohrer (rohrer@obey.reply-to.line)
Fri, 6 Dec 1996 14:07:48 -0600 (CST)
> On Thu, 5 Dec 1996, Michael Elizabeth Chastain wrote:
>
> > I have a 'make dep' that runs in half the time of the stock 2.1.14 version.
> > My patch is attached. Don't worry, it's less than 100 lines.
>
> ...
>
> One question about a couple of lines in the patch:
>
> > +set -e
> > +dir_top=`pwd`
> > +dir_list=`find $* -name '*.[chS]' -print | sed -e 's/^\(.*\)\/[^\/].*$/\1/p' | sort -u`
> > +for dir in $dir_list ; do
> > + cd $dir
> > + $dir_top/scripts/mkdep *.[chS] > .depend
> > + cd $dir_top
> > +done
>
> Couldn't the last two lines be switched for a small speed improvement?
I'm not sure. You'd have to rm .depend ahead of time and use >> rather
than >, no? Plus, every make invocation would have to load all the
dependencies... I'm not sure where the alleged speedup comes from.
Keith