On Tue, Sep 8, 2009 at 11:54 AM, John David Anglin<[email protected]> wrote: >> > =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.
Thanks Dave. Peter, can you try adding -mdisable-indexing to the CFLAGS used for this check when building for hppa? Cheers, Carlos. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
