Re^6: [XS] : "snprintf" portability options

[tonyc]

I was looking at it from the point of view that the "%I64u" format is incorrect, though it works and perl's own implementation of formatted output emulates it.

If I could be sure old MSVCRT supported "%llu" I'd make a PR switching it to the standard form, since it would let us turn on -Wformat and better detect format issues on the specialness that is Win32. And reduce confusion from people wondering what this I64 format business is.

[syphilis]

If I could be sure old MSVCRT supported "%llu" I'd make a PR switching it to the standard form

Would it be feasible to allow for both models in the source, and then base the decision on which model to implement by information gathered during the early stages of the gmake/nmake stage ?
For example, would the fact that the toolchain uses UCRT alone imply that "%llu" is supported ?
Or could a "configure" type C script be run to probe whether "%llu" is supported ?

Cheers,
Rob