[CMake] can I create all/fast target?

[Alexander Neundorf]

On Monday 16 August 2010, Daniel Nelson wrote:
> On Monday 16 August 2010 7:47:33 am naryniecki wrote:
> > Hi,
> >
> > I only want add that when I run "make t1/fast t2/fast" from command line
> > it works fine.
> >
> > Dnia 16 sierpnia 2010 15:33 naryniecki <naryniecki at o2.pl> napisał(a):
> > > Hi,
> > >
> > > for each target in Makefile generated by cmake there is another target
> > > without scanning dependencies. for example for target Radio there is
> > > Radio/fast. dependencies scanning take half of time in our building
> > > process. And we need to be able to rebuild everything as fast as
> > > possible. but there is no all/fast target. We have to much targets to
> > > put them all in command line with /fast added. I tried to create custom
> > > target which depends on all other /fast targets. like:
> > > add_custom_target(ALL_FAST DEPENDS t1/fast t2/fast) but when I try to
> > > build ALL_FAST I get that there is no target t1/fast although "make
> > > t1/fast" works fine. How can I do it?
> > >
> > > br,
> > > Marek
>
> I'm not sure if you can make a fast version of the all target, but one of
> the things I have done on my project that has helped a lot is removing
> system from the dependency scanning.  You can do this with the
> INCLUDE_REGULAR_EXPRESSION command, however it can be a little hard to use
> since you need a regular expression that matches everything you want to
> include.  It also doesn't include the surrounding <> or "" as part of the
> expression which would make it easier to remove the system includes.
>
> I ended up patching my build of cmake so that I could set a variable that
> removed all the includes that used <> from the dependency scanning.  This
> decreased my build times substantially.  I'll attach the patch which I
> believe is against version 2.8.1, if you use it just do this to turn it on:
> set(CMAKE_EXCLUDE_SYSTEM_INCLUDES ON)

It would be nice if you could put this as a wish in the bugtracker, so it 
doesn't get lost.

Alex