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[Patch, fortran] PR65024 - [4.9/5 Regression] [OOP] ICE concerning unlimited polymorphic pointer

From: Paul Richard Thomas <paul dot richard dot thomas at gmail dot com>
To: Janus Weil <janus at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>, "fortran at gcc dot gnu dot org" <fortran at gcc dot gnu dot org>
Date: Thu, 26 Feb 2015 06:33:50 +0100
Subject: [Patch, fortran] PR65024 - [4.9/5 Regression] [OOP] ICE concerning unlimited polymorphic pointer
Authentication-results: sourceware.org; auth=none

Dear All,

This patch has something of a band aid flavour about it. However, the
more I look at it the more I like it and it cannot do any harm. In any
case, I spent a silly amount of time trying to understand why this
component fails to get its backend_decl in the usual way and failed.
That it is specific to unlimited polymorphic components and only
appears when 'bug' precedes 'next' were, in principle, giveaways that
didn't do it for me.

Bootstraps and regtests on x86_64/FC21 - OK for trunk and 4.9?

Paul

2015-02-26  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/65024
    * trans-expr.c (gfc_conv_component_ref): If the component
    backend declaration is missing and the derived type symbol is
    available in the reference, call gfc_build_derived_type.

2015-02-26  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/65024
    * gfortran.dg/unlimited_polymorphic_23.f90: New test

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