[Patch, fortran] PR66079 - [6 Regression] memory leak with source allocation in internal subprogram

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

Dear All,

This patch started out fixing a single source of memory leak and then
went on to fix various other issues that I found upon investigation.

The fortran ChangeLog entry is sufficiently descripive that I do not
think that there is a need to say more.

Bootstrapped and regtested on x86_64/FC21 - OK for trunk?

I am rather sure that some of the issues go further back than 6.0. I
will investigate what should be fixed for 5.2.

Cheers

Paul

2015-05-23  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/66079
    * trans-expr.c (gfc_conv_procedure_call): Allocatable scalar
    function results must be freed and nullified after use. Create
    a temporary to hold the result to prevent duplicate calls.
    * trans-stmt.c (gfc_trans_allocate): Prevent memory leaks by
    not evaluating expr3 for scalar derived types with allocatable
    components. Fixed character length allocatable results and
    dummies need to be dereferenced. Also, if al_len is NULL use
    memsz for the string copy.

2015-05-23  Paul Thomas  <pault@gcc.gnu.org>

    PR fortran/66079
    * gfortran.dg/allocatable_scalar_13.f90: New test

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