[Bug fortran/44945] [4.6 Regression] Wrong decl for module vars / FAIL: gfortran.dg/char_array_structure_constructor.f90

["mikael at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #28 from mikael at gcc dot gnu dot org  2010-08-18 14:40 -------
(In reply to comment #27)
> This is a very good suggestion. I will have a think about how to implement it
> and will come back to you.  It is consistent with what I had in mind to improve
> the efficiency of module reading.  ie. read_module proceeds as follows:
> 
> (i) On encountering a USE statement, look for the module gsym.  If it does not
> exist, use read_module, as at present, to construct the namespace, without any
> exclusions or renames;
> (ii) In the current scope, create symtrees using the ONLY and the renames and
> point to the symbols in the gsym namespace;
> (iii) Subsequent USEs of the same module proceed by using the gsym namespace.

Hello, 

I have been trying a similar approach before.
One problem you may encounter is that symbols have non-shareable parts. 
For examples symbol attributes such as access or use_rename can differ between
symbols associated to the same entity.  
I tried to split gfc_symbol into an entity-specific part and a symbol-specific
part but that led to huge changes throughout the frontend and to the associated
regressions, so that I eventually gave up. 
A possible way might be to clone the symbol, and keep a pointer to the original
one so that we can get the original backend_decl from it. 

Maybe you will have a different path and won't encounter this problem at all. 
Good luck anyway, that seems the way to go :-)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44945