[flang-commits] [clang] [flang] [flang][Driver] Enable bare -O flag alias for flang (PR #228483)

[Kelvin Li via flang-commits]

kkwli wrote:

> > @tarunprabhu Do you have more comments? I am wondering if I can land it. Thanks.
> 
> Sorry, I missed this somehow, and it didn't occur to me on the first review. Could you add a quick entry into the release notes saying that this option is now available in flang and is an alias for -O1.

@tarunprabhu Did you mean `-O`? This option is always available. The issue is exposed when the option is used with `-flto`. Do you still want an entry in the release notes?

I notice that in https://flang.llvm.org/docs/FlangCommandLineReference.html#optimization-level, it does not mention something like `-O` alias to `-O1`. I do not know the source of this document.

https://github.com/llvm/llvm-project/pull/228483