Re: PATCH RFA: Support --enable-build-with-cxx at top level

[Paolo Bonzini <paolo dot bonzini at gmail dot com>]

Ian Lance Taylor wrote:
> Paolo Bonzini <bonzini@gnu.org> writes:
>
> > Ian Lance Taylor wrote:
> > > This patch adds support for --enable-build-with-cxx at the top level.
> > > When --enable-build-with-cxx is used, c++ is configured at stage1, and
> > > libstdc++-v3 is bootstrapped.  This also passes down CXX and
> > > CXX_FOR_BUILD to the post-stage1 passes.  (The --enable option must be
> > > mechanically convertible into the name of a shell variable, so it
> > > can't be --enable-build-with-c++).
> > Can you please try the approach of modifying
> > boot_language=${enable_build_with_cxx}?  I would very much prefer to
> > have a generic mechanism that bootstraps the target libraries for a
> > language if it is marked as a boot_language, rather than the special
> > casing of
>
> Good idea.

I like it more.  I would have preferred setting cp/config-lang.in to 
boot_language to a variable, but I know you don't want that and I'm not 
going to insist.

Wait some time for Joseph's observations and then go ahead.

Paolo