[feat/precompile-pybind11-h] feat: expose the precompiled-mode sources to non-CMake builds - #6137
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Adds pybind11.get_source_dir() / python -m pybind11 --srcdir, a srcdir variable in pybind11.pc, and Pybind11Extension(precompile=True) which compiles src/pybind11_combined.cpp into the extension and defines PYBIND11_PRECOMPILED (hard error if the sources are missing). Assisted-by: ClaudeCode:claude-fable-5
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Description
Stacked on #6136. Gives every non-CMake build system a simple way to use the precompiled mode:
pybind11.get_source_dir()andpython -m pybind11 --srcdirlocate the shippedsrc/directory (installed package or repo checkout), mirroringget_include().pybind11.pcgains asrcdir=variable.Pybind11Extension(..., precompile=True)appendssrc/pybind11_combined.cpp(single-TU amalgam) to the extension sources and definesPYBIND11_PRECOMPILED. A missing source tree is a hard error rather than a silent header-only fallback; the standalone-copiedsetup_helpers.pycontinues to work when the kwarg is not used. Each extension compiles its own copy (no cross-extension sharing), which keeps per-module state semantics.test_precompile_setup_pyintests/extra_setuptools/.Meson users:
dependency('pybind11').get_variable('srcdir')+-DPYBIND11_PRECOMPILED— a documentation snippet lands in the docs PR.Suggested changelog entry:
📚 Documentation preview 📚: https://pybind11--6137.org.readthedocs.build/