[Bug fortran/31593] Invariant DO loop variables and subroutines

[jv244 at cam dot ac dot uk]

------- 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


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31593