Re: Any way to emulate hppa? Was: gforth FTBFS on hppa
> On Mon, Sep 7, 2009 at 7:07 PM, Peter Pentchev<roam@ringlet.net> wrote:
> > On Mon, Sep 07, 2009 at 06:03:55PM +0200, Frans Pop wrote:
> >> Carlos O'Donell wrote:
> >> > I'm a debian-hppa porter, do you have a test case along with a clear
> >> > description of the problem?
> >
> > Well, the "real" test case is fetching and trying to build
> > gforth-0.7.0+ds1-4 as available in sid. =A0I'm pretty sure I could isolat=
> e
> > it to a smaller test case with access to an hppa machine; see below :)
>
> Be assured that gforth is 11th on my task list of things to accomplish
> as a debian-hppa porter. So it will be a while before I can get there,
> but I will get there (unless gmail looses my debian-hppa porter task
> list). I have an sbuild setup on my hppa machine, I will try to build
> gforth and see what happens.
>
> > =A0 typedef char * ac__type_sizeof_;
> > int
> > main ()
> > {
> > static int test_array [1 - 2 * !(((long int) (sizeof (ac__type_sizeof_)))=
> <=3D $ac_mid)];
> > test_array [0] =3D 0
> >
> > =A0;
> > =A0return 0;
> > _ACEOF
> >
> > ...which is built with different values for $ac_mid.
> >
> > The difference between gforth-0.7.0 (where this fails) and 0.6.2
> > (where it was built successfully on hppa) seems to be that 0.7.0
> > uses a typedef to do the sizeof, whereas 0.6.2 did a straight
> > sizeof (char *) in the test_array definition. =A0If this should make
> > GCC fail on this code, I'd be quite surprised, but... it seems to
> > be just so... :>
>
> Dave, what do you think of this code?
The C standard doesn't allow using an array to access memory outside
the bounds of the array (that's not exactly right, but close enough).
On hppa, doing this will result in a segv if -mdisable-indexing isn't
specified.
Much of Ada is built using this option. I haven't played with Forth in
years, but I suspect it may also need to use -mdisable-indexing for
certain code.
Dave
--
J. David Anglin dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)
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