ISIOWrap broken for int64/uint64 (on some architectures?)

[DasVinch]

I'm having an issue where I can't instantiate int64/uint64 Images from ISIOWrap.

it boils down to a type descriptor mismatch between what is consider "long" and "long long". in ImageStreamIODataType PyFormatToImageStreamIODataType(const std::string &pf) and the reverse function.

What I pass down from numpy as pf == "l" and "L" respectivelent for np.int64 and np.uint64...
However... py::format_descriptor<int64_t>::format() is q and the uint version returns Q.

Per https://numpy.org/doc/stable/reference/arrays.scalars.html, I understand this is a variation in the spec between int and longlong...
I think (from my very quick browsing) that this has been introduced at 1.16. It is possible that I haven't tried to make a uint64 SHM for all that time.

Oh no!

[a-sevin]

I'm in vacation with a short time to check my mail. The solution could be here: pybind/pybind11#1908 (comment)

[a-sevin]

when py::format_descriptor<int64_t>::format() is q and the uint version returns Q, it means you are on a 32bit linux...
But I have the same issue on my laptop... Strange...