[Patch, fortran] PR51976 - [F2003] Support deferred-length character components of derived types (allocatable string length)

[Tobias Burnus]

W Spector wrote:
> 3.) My example in comment #12 appears to work fine.  However when 
> running the example under valgrind, memory leaks are indicated.  I cut 
> the example down quite a bit, and it seems that there are leaks 
> regardless of whether derived types are used or not.  So this isn't a 
> regression due to this patch, but something that has been around for a 
> while:

The problem is that variables in the Fortran main program have the SAVE 
attribute - that has been made explicit in the Fortran 2008 standard.

Before finalization, it wasn't detectible by a standard-conforming 
Fortran program - but with finalization, it all of a sudden is. Hence, 
GCC 4.9 no longer deallocates allocatables in the main program. One 
could try to still do the deallocation for nonderived types or for those 
without finalizers - but simply not deallocating seems to be way easier 
and more consistent.

Note that the 4.9 release notes mention this change.

Tobias