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BLD/DEP: any cp315-abi3t wheel requires numpy>=2.5.0 at runtime #20493
Description
targeting abi3t for C code that depends on numpy explicitly requires setting at least this build-time requirement
#define NPY_TARGET_VERSION NPY_2_5_API_VERSION
but then the resulting binary cannot be used against any older version at runtime. Even by SPEC 0, this is a very aggressive runtime requirement to make. I'm planning to experiment with building cp315-abi3t wheels, but publishing them would require adding logic to the build system so that the runtime requirement on numpy can be modified dynamically at build time. This issue is a reminder of that, and a sub-issue to #19249
Activity
yashgoyal0110 commentedon Sep 29, 2026
Hey @neutrinoceros
is it open for contribution?
neutrinoceros commentedon Sep 30, 2026
not at the moment. This is a reminder issue for when existing blockers are lifted.
neutrinoceros commentedon Oct 16, 2026
It is definitely possible to run numpy-dependent
abi3twheels against older numpy at runtime. I just confirmed it with some PyO3-based extensions. I might look there for a solution.