What language and solver does this apply to?
Python (packaging/wheels)
Describe the problem you are trying to solve.
Since 9.12, free-threaded wheels (cp313t, and cp314t as of 9.15) are published on PyPI, but only for Linux (manylinux x86_64/aarch64). There are no free-threaded wheels for macOS or Windows, so packages that depend on ortools cannot support free-threaded Python on those platforms without building OR-Tools from source.
For example, k-means-constrained depends on ortools.graph.python.min_cost_flow and is adding free-threaded (3.14t) wheels for true multi-threaded solving — those wheels can currently only be published for Linux because of this gap.
Describe the solution you'd like
Publish cp313t/cp314t wheels for macOS (x86_64 and arm64) and Windows (amd64) alongside the existing regular wheels, matching the platform coverage of the non-free-threaded builds.
Describe alternatives you've considered
Building OR-Tools from source in downstream CI, which is a heavy full C++ build and impractical for most dependent packages.
Additional context
Related: #4438 (original 3.13t wheel request) and #5243, which adds the Py_mod_gil_not_used declaration to the graph modules so importing them keeps the GIL disabled on free-threaded builds.
What language and solver does this apply to?
Python (packaging/wheels)
Describe the problem you are trying to solve.
Since 9.12, free-threaded wheels (cp313t, and cp314t as of 9.15) are published on PyPI, but only for Linux (manylinux x86_64/aarch64). There are no free-threaded wheels for macOS or Windows, so packages that depend on ortools cannot support free-threaded Python on those platforms without building OR-Tools from source.
For example, k-means-constrained depends on
ortools.graph.python.min_cost_flowand is adding free-threaded (3.14t) wheels for true multi-threaded solving — those wheels can currently only be published for Linux because of this gap.Describe the solution you'd like
Publish cp313t/cp314t wheels for macOS (x86_64 and arm64) and Windows (amd64) alongside the existing regular wheels, matching the platform coverage of the non-free-threaded builds.
Describe alternatives you've considered
Building OR-Tools from source in downstream CI, which is a heavy full C++ build and impractical for most dependent packages.
Additional context
Related: #4438 (original 3.13t wheel request) and #5243, which adds the
Py_mod_gil_not_useddeclaration to the graph modules so importing them keeps the GIL disabled on free-threaded builds.