[Patch, fortran] PR58410 - [4.8/4.9 Regression] Bogus uninitialized variable warning for allocatable derived type array function result

[Paul Richard Thomas <paul dot richard dot thomas at gmail dot com>]

Dear All,

This turned out to be a valid uninitialized variable warning.
However, it was unlikely ever to cause problems at run-time.
Nonetheless, here is the fix. I am disinclined to load the testsuite
with a  fix that is so specific and localized that it simply will not
break.  However, if reviewers think otherwise, I can easily add the
original testcase.

Bootstrapped and regtested on FC17/x86_64 - OK from trunk and 4.8?

Cheers

Paul

2013-11-30  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/58410
    * trans-array.c (gfc_alloc_allocatable_for_assignment): Do not
    use the array bounds of an unallocated array but set its size
    to zero instead.

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