Re: [cxx-conversion] Remove option to build without a C++ compiler (issue6296093)

[Diego Novillo <dnovillo at google dot com>]

On 12-06-20 10:10 , Steven Bosscher wrote:

> > -# By default, C is the only stage 1 language.
> > +# By default, C and C++ are the only stage 1 languages.
> >   stage1_languages=,c,
>
> So shouldn't you add c++ here?

That was a bad change on the comment.  We only need C for stage1. 
Thanks for spotting it.

> > -  # If bootstrapping, then using --enable-build-with-cxx or
> > -  # --enable-build-poststage1-with-cxx requires enabling C++.
> > -  case ",$enable_languages,:,$ENABLE_BUILD_WITH_CXX,$ENABLE_BUILD_POSTSTAGE1_WITH_CXX,:$enable_bootstrap" in
> > -    *,c++,*:*:*) ;;
> > -    *:*,yes,*:yes)
> > +  # If bootstrapping, C++ must be enabled.
>
> Hmn, perhaps I misunderstand, but shouldn't C++ also be enabled if not
> bootstrapping?

It's only needed if we are building C++ code.  Everything else uses the 
host compiler.


> You can also remove the lang_requires_boot_languages machinery again.
> It is only used by Go to enable c++ for bootstrapping the Go front
> end, but with c++ enabled by default, there is no need for this hack
> for Go anymore.

Good point.  I'll send a separate patch for that.


Diego.