[Bug fortran/36192] ICE with wrong index types and bad parens

["dominiq at lps dot ens dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from dominiq at lps dot ens dot fr  2008-05-11 16:40 -------
For the record: after fixing the syntax errors, the executable gives an
infinite loop when compiled with gfortran 4.3.0 on *i-apple-darwin9 and 4.4.0
(patched) on i686-apple-darwin9, but not on 4.4.0 (also patched) on
powerpc-apple-darwin9.  The infinite loop comes from a nasty (even for trained
eyes) typo which leaves the intent(out) dummies xn and vn unset on return of
subroutine step (since the code seems to be some homework, I leave the reporter
complete the debugging himself).

The points of interest for the gfortran maintainers are: 

(1) are there other platforms on which there is no infinite loop? and if yes
why?
(2) I think the problem could be diagnosed at compiled time (possibly with -O
only). If it can now, I did not find the right option. If not, should I open a
pr along this line or would it deemed too difficult to implement?

Final note, the code has at least another bug (hint: set n=2, d=3 and compile
with -fbounds-check).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36192