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[Bug fortran/31593] Invariant DO loop variables and subroutines
- From: "jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 Aug 2009 10:05:58 -0000
- Subject: [Bug fortran/31593] Invariant DO loop variables and subroutines
- References: <bug-31593-10391@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #32 from jv244 at cam dot ac dot uk 2009-08-15 10:05 -------
(In reply to comment #29)
> It's the other way around: If output were to modify any of its
> arguments, the program would be illegal. Therefore, the compiler can
> assume that this doesn't happen. Intent(in) would be redundant for this
> particular case (though useful, so the compiler could easier detect
> errors).
that's true for pX, but value can be modified by output. I.e. this is (afaict)
valid fortran that write the numbers from 1 to 10
n=10
DO i=1,n
n=0
write(6,*)i
ENDDO
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31593