[flang-commits] [flang] [flang] Warn when F128 is unsupported (PR #102147)

[Daniel Chen via flang-commits]

DanielCChen wrote:

Hi Slava and Tom,
Currently we have `LDBL_MANT_DIG` as 106 as we are defaulting to IBM long double format which is different from IEEE 128.
We had some internal discussion about this. It seems we will at some point in the future to switch to IEEE 128 format by default on LoP. By then, it should satisfy the check in this PR and we should no longer see those warning messages. 
Therefore, I think we can live with those "regressions" until then.

https://github.com/llvm/llvm-project/pull/102147