C++ front end

[Richard Earnshaw]

> Hi,
> 
> On Wed, 26 Jun 2002, Richard Earnshaw wrote:
> 
> > Right, but this is just a waste of cpu cycles.  If the stage2 and stage3
> > C++ compilers compare identically, then anything built with them will also
> > compare identically (since they are, effectively the same compiler).
> >
> > So we might as well just defer building X to stage3.
> 
> Yep.  Although I think we currently do the same.  With this reasoning we
> also wouldn't need to build the fortran, C++, ObjC and java compilers in
> each stage (or generally all frontends written in C), as it's only the C
> compiler which is anyway excercised here.  AFAIK we don't do anything with
> those compilers in stage2, so we could defer also those to stage3.  Would
> throttle back bootstrap times a little.

No, the other C-coded front ends are built with different compilers (the 
object files in stage1 and stage2 do NOT compare equally).  So it *IS* 
useful to compare the results of those front ends for equivalence.

If the stage1 and stage2 compilers compared identically, then building 
stage3 would be pointless.

R.