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Re: [fortran, patch] Remove unused elements in array argument to set_options
On Mon, Dec 19, 2016 at 11:29:45PM +0100, FX wrote:
> > Thinking out loud here. I wonder, however, if we want
> > to future proof the library against changes to the
> > options passed by having a few spare unused entried
> > available. This of course only helps if a new option
> > needs to be added. It does nothing for removal.
>
> That’s actually the way gfortran_set_options() works, to ensure that we can add options in the future: in main() we allocate an array of values, and pass that array and its size to gfortran_set_options(). gfortran_set_options() then deals with the number of options passed, meaning if an older program calls a newer library, the runtime will simply use default values for all options there were not passed.
>
> And when we remove options, we simply pass zero values in their stead — until we break the ABI, when we clean up everything.
>
> Patch committed, thanks for reviewing.
>
Thanks for the detailed explanation.
--
Steve
http://troutmask.apl.washington.edu/~kargl/
2. https://www.youtube.com/watch?v=Py6d6o2jbaE
1. https://www.youtube.com/watch?v=6hwgPfCcpyQ