allocate on assignment problem

[Tobias Burnus]

Hi Macro, hello all,

marco restelli wrote:
> On Thu, Sep 4, 2008 at 9:15 AM, Daniel Kraft <d@domob.eu> wrote:
>   
>> marco restelli wrote:
>>     
>>> the attached code compiles with gfortran but produces segmentation
>>> fault at execution. Is this a gfortran problem in the allocation on
>>> assignment or is it me missing something?
>>>       
>> I don't think allocation on assignment is implemented in gfortran, see
>> http://gcc.gnu.org/wiki/Fortran2003Status and thus you would try to write
>> into an unallocated array and cause the segfault.  I'm not 100% sure about
>> this, however.
>>     
It is half implemented. Reallocation on assignment is implemented for 
derived types, but not for intrinsic types.

Hmm, I re-read the bug report, 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35810, and seemingly there 
are additional issues: Not all reallocations seem work for derived 
types; those with constructors do work.

For the time being, I would (re)allocate by hand. Also other compilers 
such as ifort do not support reallocation with the default options 
(ifort does support it with -assume realloc_lhs [the reason is that this 
slows down all programs - and since only program did not use it]).

As GCC/gfortran is now in stage3 (only bug fixes), I think the support 
will be deferred to GCC 4.5. The chances are very high that this feature 
will be implemented in 4.5.

Tobias