Re: [Patch, Fortran] convert almost all {warning,error}_now to common diagnostic

[Tobias Burnus <burnus at net-b dot de>]

FX:
> > (a) those majority which might need buffering (gfc_error, gfc_warning);
> Is there a plan for those in the longer term?

Well, the long-term solution is of course to support them. That requires 
adding buffering+discarding support to the common machinery and to use 
it then in gfortran. It's on Manuel's to-do list, but he suffers from 
the generic problem of finding the time to actually do it. Maybe he 
manages to finish that part by early next year - which might or might 
not be suitable for GCC 5 inclusion.

Similarly for the support of multiple locations, which would be the next 
item on his Fortran agenda.

For my side, I was thinking of moving closer to the common 
infrastructure for reading files, which should help with some issues in 
scanner.c (last cases of gfc_warning_now_1). That and locking with 
-fcoarray=lib currently rank high on my gfortran agenda.

The changes to scanner.c also would prepare the way for supporting 
encodings in strings (like 4_'UTF-8 string' working properly) and for 
recoding macros such that macro expansion can be properly handled. But 
all those will surely require quite some extra work - including more 
work to the common diagnostic machinary as the offset calculation will 
no longer work in that case. In any case, those are GCC 6+ items.

Tobias