[patch, fortran] PR77828 Linking gfortran-7 compiled program with libgfortran of 5.x allowed but crashes

[Jerry DeLisle]

On 10/24/2016 07:49 AM, Janne Blomqvist wrote:
> On Mon, Oct 24, 2016 at 2:53 PM, Jerry DeLisle <jvdelisle@charter.net> wrote:
>> On 10/18/2016 04:48 PM, Jerry DeLisle wrote:
>>>
>>> Hi Folks,
>>>
>>> The attached patch does some minor cleanup and bumps the libgfortran
>>> version
>>> number.  I have wanted to reorder the dtp structure for many years now.
>>> Not
>>> strictly needed but it has bugged me forever.
>>>
>>> The bump is needed because of the significant changes from implementation
>>> of DTIO.
>>>
>>
>> --- snip ---
>>
>> Revised patch. Changed a single byte char to int for better memory alignment
>> on 32 bit boundaries. Regression tested on x86-64-linux, FreeBSD, and
>> Power8.
>>
>> I plan to commit this to trunk sometime today.
>
> I understood from https://gcc.gnu.org/ml/fortran/2016-10/msg00168.html
> that fortran-dev won't be in shape for merging until GCC 8 stage 1. If
> so, shouldn't we avoid breaking the ABI until then?
>

The ABI is already changed with the UD-DTIO changes, so we need to bump version 
to avoid surprises with other earlier versions.

Jerry