More speed increases for make-ing ports

[Stephen Montgomery-Smith]

Andrew Pantyukhin wrote:
> On 5/22/07, Alexander Leidinger <Alexander at leidinger.net> wrote:
>> Quoting Andrew Pantyukhin <infofarmer at FreeBSD.org> (from Tue, 22 May
>> 2007 11:55:39 +0400):
>>
>> > On 5/22/07, Kris Kennaway <kris at obsecurity.org> wrote:
>> >> On Tue, May 22, 2007 at 01:47:23AM -0500, Stephen Montgomery-Smith 
>> wrote:
>> >>> This small modification cuts off about 25% off pkg_version on my 
>> system.
>> >>>
>> >>> Basically bsd.gnome.mk recursively finds all the dependencies, but 
>> many
>> >>> of them are listed many times.  This makes make work extra hard 
>> when it
>> >>> doesn't have to.  I simply weed out the repeated entries.
>> >>>
>> >>
>> >>> --- bsd.gnome.mk-orig Tue May 22 01:29:08 2007
>> >>> +++ bsd.gnome.mk      Tue May 22 01:29:22 2007
>> >>> @@ -655,6 +655,8 @@
>> >>>  _USE_GNOME+= ${${component}_USE_GNOME_IMPL} ${component}
>> >>>  . endfor
>> >>>
>> >>> +_USE_GNOME!=(for i in ${_USE_GNOME}; do ${ECHO_CMD} $$i; done) | 
>> sort -u
>> >>> +
>> >>>  # Setup the GTK+ API version for pixbuf loaders, input method 
>> modules,
>> >>>  # and theme engines.
>> >>>  PLIST_SUB+=                  GTK2_VERSION="${GTK2_VERSION}"
>> >>
>> >> Be careful, != assignments may add thousands of process invocations to
>> >> large targets like 'make index' and can slow it down dramatically.
>> >
>> > Right, and uniqueness logic can be implemented in make.
>>
>> Be proactive and tell/point out how... :)
> 
> TMTOWTDI. There are several examples in bsd.*.mk. The
> obvious one is "flags" (you set or unset flag vars
> first, then traverse them and add what you need to
> the list). In recent versions of our make you can
> also use ${VAR:O:u}

I must admit I was looking for the :u.  Definitely a good feature - 
maybe it could be invoked in the make file conditional on an appropriate 
value of OSVERSION.

Incidently if you want to save a few more != assignments, I notice that 
setting the variables
ARCH=i386
OPSYS=FreeBSD
OSREL=6.2
OSVERSION=602110
in /etc/make.conf will do this for you.  Of course, you then have to 
keep this info up to date (e.g. change OSVERSION every time you do a 
"make world"), and it doesn't really seem to save a lot of time on my 
system, but I would be interested to hear other reports.