[racket-dev] SGC as default

I'm not sure how difficult it will be. It's tedious enough that the
last time I thought about it, I just left a note next to
"no-cgc-needed" in "racket/src/racket/Makefile.in", but maybe it's
worth pursuing now.

At Tue, 12 Aug 2014 04:39:55 -0700, Sam Tobin-Hochstadt wrote:
> How difficult would it be to allow the bootstrap process to use a
> preexisting Racket installation? This would alleviate some of the
> performance loss, for example in rebuilds by developers or in continuous
> integration.
> 
> Sam
> On Aug 11, 2014 11:16 PM, "Matthew Flatt" <mflatt at cs.utah.edu> wrote:
> 
> > I've changed the Racket CGC implementation --- which is mostly used
> > only to build the normal Racket variant --- to use SGC by default,
> > instead of the Boehm GC. The intent of the switch is to make the more
> > portable GC the default.
> >
> > If you have an existing build in a repo checkout, then `make` is likely
> > to fail, because the makefile dependencies are not precise enough to
> > deal with the switch. You can discard your old build directory, or it
> > might work to simply delete
> >
> >   <builddir>/racket/libmzgc.a
> >
> > If you're using CGC and want to continue using the Boehm GC, then
> > provide `--disable-sgc` to `configure`. I've tuned SGC to bring its
> > performance closer to the Boehm GC, but it's still slower.
> >
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