Re: Bug#1116453: mpi4py: FTBFS on sh4: too large for field of 2 bytes

Control: severity -1 important

Hi Drew,

On Sat, 2025-09-27 at 15:23 +0200, Drew Parsons wrote:
> mpi4py has started failing to build on sh4:
> 
> building 'mpi4py.MPI' extension
> creating build/temp.linux-sh4-cpython-313/src/mpi4py
> /usr/bin/mpicc -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DPYMPIABI=1 -DHAVE_DLFCN_H=1 -DHAVE_DLOPEN=1 -Isrc -I/usr/include/python3.13 -c src/mpi4py/MPI.c -o build/temp.linux-sh4-cpython-313/src/mpi4py/MPI.o
> src/mpi4py/MPI.c: In function ‘__pyx_pymod_exec_MPI’:
> src/mpi4py/MPI.c:289780:30: note: variable tracking size limit exceeded with ‘-fvar-tracking-assignments’, retrying without
> 289780 | static CYTHON_SMALL_CODE int __pyx_pymod_exec_MPI(PyObject *__pyx_pyinit_module)
>        |                              ^~~~~~~~~~~~~~~~~~~~
> /tmp/cczUpbyN.s: Assembler messages:
> /tmp/cczUpbyN.s:8852502: Error: value of 0001528e too large for field of 2 bytes at 0003995f
> error: command '/usr/bin/mpicc' failed with exit code 1
> 
> 
> Likely due to changes in gcc-15, aided and abetted by cython 3.0.
> Upstream suggests building with -DCYTHON_LIMITED_API=1
> see https://github.com/mpi4py/mpi4py/pull/690#issuecomment-3337456651

Thanks a lot for investigating this issue and reporting it, I will have a look.

However, since sh4 is not a release architecture, the severity should be lowered.

Adrian

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