[LLVMdev] Optional Target Builds

[Andrew Lenharth]

On Thu, 2005-04-21 at 23:58 -0700, Reid Spencer wrote:
> On Fri, 2005-04-22 at 00:33 -0500, Chris Lattner wrote: 
> > On Thu, 21 Apr 2005, Reid Spencer wrote:
> > > With Misha's changes requiring a total rebuild, I've been reminded how
> > > long the targets take to build. Now that there are more of them and in
> > > most cases I really don't care about n-1 of them, I'm wondering if its
> > > time to have configure allow optional compilation for them.
> > >
> > > I would like to suggest:
> > >
> > > 1. The default (build all targets) remains the same
> > > 2. We add to configure --disable-target-x86 to disable building the x86
> > > target. Similarly for all other targets
> > > 3. We add to configure --disable-foreign-targets to disable all but the
> > > current host's target type.
> > >
> > > This will require a little bit of configure magic and some changes to
> > > the makefiles.
> > 
> > Sounds great to me.  I would suggest --disable-cross-targets instead of 
> > --disable-foreign-targets though.
> 
> Actually, the options have to be expressed as "enable-something" so
> I've opted for "--enable-target-this" to enable just the $host target.
> if you specify --disable-target-this (the default) then you get
> whatever platforms you specify with --enable-target-{targetname}
> Does that make sense or do you have a better idea?

-enable-targets=x86,alpha,sparcv9
-link-targets=alpha,host

Valid options for both are:
the names of the targets
host
all

where all is the default for both items

I have in my tree the patch to partially support this (well the link
half of it).  Right now I am controlling linking with a variable in the
toplevel makefile until a config patch like this goes in.

Andrew Lenharth
http://www.lenharth.org/~andrewl/