On Wed, Oct 22, 2008 at 8:48 AM, Paul Smith <[EMAIL PROTECTED]> wrote: > On Wed, 2008-10-22 at 08:24 -0500, Peng Yu wrote: >> The reason that I want to use 'compgen' rather than 'find' is that I >> think it is faster than 'find', since it's a bash builtin command. I'm >> not sure whether this is a good enough reason to use it. Do you have >> any idea? > > It probably is marginally faster. I doubt, for this situation, whether > it will make a noticeable difference (especially if you change the = > to := as I suggested... that will make MUCH more difference to > performance). Of course there's only one way to know: measure it. In > general it's quite useless to try to solve performance problems before > you know what's causing them. Premature optimization is a sure way to > waste a lot of development time and effort. > > However, if this IS a big performance difference then only you can > decide whether being portable is more or less important than the > performance increase. We don't know your environment. > > Note that not even all Linux distributions use bash as /bin/sh, much > less other versions of UNIX/POSIX systems, so the portability problems > are quite real. > > > BTW, if I'm reading your code right I think you could get even better > efficiency in a more portable way by using make builtin functions rather > than $(shell ...); maybe something like: > > SUBDIRS := $(filter-out backup bash,$(patsubst %/.,%,$(wildcard */.)))
This would give something other than directories. Is there a way in make to get only directory names? Thanks, Peng _______________________________________________ Help-make mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-make
