Am Fr., 16. Feb. 2024 um 07:15 Uhr schrieb Elliott Sales de Andrade
<quantum.anal...@gmail.com>:
>
> On Thu, Feb 15, 2024 at 11:39 PM Orion Poplawski <or...@nwra.com> wrote:
> >
> > We're hitting this with h5py on i686:
> >
> > /builddir/build/BUILD/h5py-3.10.0/serial/h5py/defs.c: In function
> > ‘__pyx_f_4h5py_4defs_H5Dread_chunk’:
> > /builddir/build/BUILD/h5py-3.10.0/serial/h5py/defs.c:14922:85: error:
> > passing argument 4 of ‘H5Dread_chunk’ from incompatible pointer type
> > [-Wincompatible-pointer-types]
> > 14922 | __pyx_v_r = H5Dread_chunk(__pyx_v_dset_id,
> > __pyx_v_dxpl_id, __pyx_v_offset, __pyx_v_filters, __pyx_v_buf);
> > |
> > ^~~~~~~~~~~~~~~
> > |
> > |
> > |
> > __pyx_t_5numpy_uint32_t * {aka long unsigned int *}
> > In file included from /usr/include/hdf5.h:25,
> > from
> > /builddir/build/BUILD/h5py-3.10.0/serial/h5py/api_compat.h:27,
> > from
> > /builddir/build/BUILD/h5py-3.10.0/serial/h5py/defs.c:1246:
> > /usr/include/H5Dpublic.h:1003:92: note: expected ‘uint32_t *’ {aka
> > ‘unsigned int *’} but argument is of type ‘__pyx_t_5numpy_uint32_t *’
> > {aka ‘long unsigned int *’}
> > 1003 | H5_DLL herr_t H5Dread_chunk(hid_t dset_id, hid_t dxpl_id, const
> > hsize_t *offset, uint32_t *filters,
> > |
> > ~~~~~~~~~~^~~~~~~
> > /builddir/build/BUILD/h5py-3.10.0/serial/h5py/defs.c: In function
> > ‘__pyx_f_4h5py_4defs_H5Pget_driver_info’:
> > /builddir/build/BUILD/h5py-3.10.0/serial/h5py/defs.c:31935:13: warning:
> > assignment discards ‘const’ qualifier from pointer target type
> > [-Wdiscarded-qualifiers]
> > 31935 | __pyx_v_r = H5Pget_driver_info(__pyx_v_plist_id);
> > | ^
> >
> >
> > It seems that numpy is defining a uint32_t type as long unsigned int on
> > i686, while glibc(?) is defining it as unsigned int.
>
> Yes, looking at NumPy's header [1], it appears to check `long` first,
> then `long long`, then `int`, then `short`, and assigns the first one
> that matches to the matching bit-length. So it should pick unsigned
> long for npy_uint32 before unsigned int if they are both 4 bytes wide.
>
> > Now what puzzles
> > me a little is that on i686 aren't these both 4-byte integers and no not
> > incompatible at all?
>
> Yes, I think they are the same size, as demonstrated on a 32-bit mock:
They are the same (bit size, signedness, general type) but not equal
(long int vs int), and with gcc14 this became an error. I"m sure it
always warned about that before.
> > What should be done here?
> >
>
> I guess that depends on how glibc sets things up, but perhaps it would
> work better if NumPy checked from smallest to largest as defined in C
> (short -> int -> long -> long long)?
>
> [1]
> https://github.com/numpy/numpy/blob/308273e94bcf49980be9d5ded2b0ff5b4dd3a897/numpy/_core/include/numpy/npy_common.h#L488
numpy definitely needs to fix this. You cannot just go by bitsize and
signedness. You never could and now you can't ;)
I'm surprised this didn't come up during our "gcc 14 ride".
Michael
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