[flang-commits] [clang] [flang] [flang] Add -finit-local= to initialize automatic variables (PR #216164)

[Daniel Chen via flang-commits]

DanielCChen wrote:

> > +1 to the engineering but I fundamentally disagree with having `-finit-local=` cover all types at once. Assigning some arbitrary value to integer and logical when `=snan` is specified doesn't make sense to me. I think starting with gfortran's options is the way to go - and if you want to add the ability to specify a hex value in addition, even better.
> 
> Thanks for the quick review!
> 
> I have no objection to start with only `zero` and `0x<hex>` to begin with and leave `nan` and `snan` out as those two (`zero` and `hex`) are the most common usage. The Gfortran's `-finit-local-zero` is already implemented in this PR as an aliasing to `-finit-local=zero`. I think we should keep this option format so it is easier to expand in the future.

@rscottmanley 
I generated a Type mapping table for `-finit-local=` to show how each type is implemented so that we can decide if we want to drop the support for `nan` and `snan` for this PR.

https://github.com/llvm/llvm-project/pull/216164