Re: [doc,patch] Fortran compiler on Ultrix and clobbered registers

["John David Anglin" <dave at hiauly1 dot hia dot nrc dot ca>]

> I noted in the GCC docs (see for example http://gcc.gnu.org/ 
> onlinedocs/gcc/Interoperation.html) that we have the following text  
> in the section "Known Causes of Trouble with GCC":
> 
> > On Ultrix, the Fortran compiler expects registers 2 through 5 to be  
> > saved by function calls. However, the C compiler uses conventions  
> > compatible with BSD Unix: registers 2 through 5 may be clobbered by  
> > function calls.
> >
> > GCC uses the same convention as the Ultrix C compiler. You can use  
> > these options to produce code compatible with the Fortran compiler:
> >           -fcall-saved-r2 -fcall-saved-r3 -fcall-saved-r4 -fcall- 
> > saved-r5
> 
> That code was initially committed to gcc/gcc.texi in 1997 (it's now  
> in gcc/doc/gcc.texi). As there have been a few changes on the  
> compiler since that time, I wonder if it's still true, and still  
> useful to have that comment there. As there is no ultrix maintainer  
> (though it's still listed as a supported platform), I'm CCing the VAX  
> maintainers: can you comment on the usefulness of this part of the doc?

As far I can tell, the options are still supported and the comment
is accurate.

Whether it's still useful is another matter.  Although vax-ultrix
is still nominally supported, there is no remaining interest in this
port.  I haven't attempted a build since 4.1.  So, I wouldn't object
to your removing this comment.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)