file_offset_t < size_t on mingw

[mulimoen]

Describe the bug
Using the mingw toolchain we encounter a problem in the assertation on the following

hdf5/src/H5FDstdio.c

Line 354 in ac07382

assert(sizeof(file_offset_t) >= sizeof(size_t));

which crashes the program

Expected behavior
The assertation to not trigger a crash.

Platform

• Default windows github runner
• HDF5 version 1.14.1-2 from source
• Microsoft Windows Server 2022
• Mingw-w64 11.2.0
• CMake 3.26.4

Additional context

• A build log can be found here https://github.com/aldanor/hdf5-rust/actions/runs/5225628766/jobs/9435350340?pr=243
• Found when trying to use 1.14.1 in hdf5-rust

[derobins]

We don't have great testing for MinGW, but I would like to get that set up as a GitHub action ASAP so we can fix these issues.

[aldanor]

@derobins mingw builds are very easy to set up on github actions (you can check hdf5-rust CI as an example).

Would really appreciate if this was looked into since it's currently a blocker for us bundling 1.14 for static builds.

[derobins]

@aldanor and/or @mulimoen - shoot me an email at derobins at hdfgroup dot org and we'll get this fixed.

[derobins]

Is this still a problem? We build and test MinGW in several environments now and we don't see this assert being tripped.

[mulimoen]

We still see the problem: https://github.com/mulimoen/hdf5-rust/actions/runs/11579804898/job/32236915194

[derobins]

Let me know if this PR fixes the problem. It should be merged in the next day or so.

#5064

Update: It's in. Let me know if this fixes your problem!